[libcxx-commits] [libcxx] [libcxx] cbegin should always return a constant iterator (PR #99915)
A. Jiang via libcxx-commits
libcxx-commits at lists.llvm.org
Fri Nov 1 18:14:17 PDT 2024
https://github.com/frederick-vs-ja updated https://github.com/llvm/llvm-project/pull/99915
>From 5b9c2df7c1a88a52c3a854a192097925fc6610e4 Mon Sep 17 00:00:00 2001
From: Nicole Mazzuca <nicole at strega-nil.co>
Date: Mon, 2 Sep 2024 13:52:03 +0200
Subject: [PATCH 1/5] [libcxx] `cbegin` should always return a constant
iterator
Papers:
- [P2278R4][]: `cbegin` should always return a constant iterator
- [P2836R1][]: `std::basic_const_iterator` should follow its
underlying type's convertibility
Issues:
- [LWG3765][]: `const_sentinel` should be constrained
- [LWG3766][]: `view_interface::cbegin` is underconstrained
- [LWG3770][]: `const_sentinel_t` is missing
- [LWG3769][]: `basic_const_iterator::operator==` causes infinite
constraint recursion
- [LWG3853][]: `basic_const_iterator<volatile int*>::operator->` is
ill-formed
- [LWG3862][]: `basic_const_iterator`'s `common_type` specialization
is underconstrained
- [LWG3872][]: `basic_const_iterator` should have custom `iter_move`
- [LWG3946][]: The definition of `const_iterator_t` should be reworked
- [LWG3948][]: _`possibly-const-range`_ and _`as-const-pointer`_
should be `noexcept`
Implements
- `basic_const_iterator`, `const_iterator`, and `const_sentinel`
- The const accessors - `ranges::{cbegin,cend,crbegin,crend}`
- Add `cbegin` and `cend` member functions to `view_interface`
- `ranges::as_const_view`, `ranges::views::as_const`
- The changes to `span`
- `cdata`
- The changes from [P2836R1][].
Drive-by:
- Fix some includes that would have been circular.
[P2278R4]: https://wg21.link/p2278r4
[P2836R1]: https://wg21.link/p2836r1
[LWG3765]: https://wg21.link/lwg3765
[LWG3766]: https://wg21.link/lwg3766
[LWG3770]: https://wg21.link/lwg3770
[LWG3769]: https://wg21.link/lwg3769
[LWG3853]: https://wg21.link/lwg3853
[LWG3862]: https://wg21.link/lwg3862
[LWG3872]: https://wg21.link/lwg3872
[LWG3946]: https://wg21.link/lwg3946
[LWG3948]: https://wg21.link/lwg3948
---
libcxx/docs/FeatureTestMacroTable.rst | 2 +-
libcxx/docs/Status/Cxx23Issues.csv | 14 +-
libcxx/docs/Status/Cxx23Papers.csv | 2 +-
libcxx/docs/Status/Cxx2cIssues.csv | 4 +-
libcxx/docs/Status/Cxx2cPapers.csv | 2 +-
libcxx/include/CMakeLists.txt | 4 +-
.../include/__algorithm/ranges_reverse_copy.h | 10 +-
.../__format/range_default_formatter.h | 2 +-
libcxx/include/__format/range_formatter.h | 2 +-
libcxx/include/__iterator/const_iterator.h | 351 ++++++++++++++++++
libcxx/include/__iterator/reverse_iterator.h | 13 -
libcxx/include/__ranges/access.h | 62 ++--
libcxx/include/__ranges/as_const_view.h | 205 ++++++++++
libcxx/include/__ranges/concepts.h | 14 +-
libcxx/include/__ranges/const_access.h | 266 +++++++++++++
libcxx/include/__ranges/data.h | 102 -----
libcxx/include/__ranges/owning_view.h | 1 -
libcxx/include/__ranges/rbegin.h | 29 --
libcxx/include/__ranges/ref_view.h | 1 -
libcxx/include/__ranges/rend.h | 28 --
libcxx/include/__ranges/view_interface.h | 22 ++
libcxx/include/iterator | 29 ++
libcxx/include/module.modulemap | 4 +-
libcxx/include/ranges | 12 +-
libcxx/include/span | 68 +++-
libcxx/include/string_view | 2 +-
libcxx/include/version | 4 +-
libcxx/modules/std/iterator.inc | 15 +-
libcxx/modules/std/ranges.inc | 14 +-
...range_concept_conformance.compile.pass.cpp | 7 +
.../views.span/span.iterators/begin.pass.cpp | 138 +++----
.../views.span/span.iterators/end.pass.cpp | 141 +++----
.../span.iterators/iterator.pass.cpp | 17 +-
...rator_concept_conformance.compile.pass.cpp | 20 +
.../views.span/span.iterators/rbegin.pass.cpp | 141 +++----
.../views.span/span.iterators/rend.pass.cpp | 137 +++----
.../iterators/const.iterators/alias.pass.cpp | 32 ++
.../const.iterators/iterator.pass.cpp | 139 +++++++
.../ranges.version.compile.pass.cpp | 34 +-
.../version.version.compile.pass.cpp | 34 +-
.../std/ranges/range.access/begin.pass.cpp | 160 ++++----
.../std/ranges/range.access/cbegin.pass.cpp | 207 +++++++++++
.../std/ranges/range.access/cbegin.verify.cpp | 25 ++
.../std/ranges/range.access/cend.pass.cpp | 207 +++++++++++
.../std/ranges/range.access/cend.verify.cpp | 25 ++
.../std/ranges/range.access/data.pass.cpp | 126 ++++++-
.../test/std/ranges/range.access/end.pass.cpp | 159 ++++----
.../std/ranges/range.access/rbegin.pass.cpp | 233 +++++++-----
.../std/ranges/range.access/rend.pass.cpp | 227 ++++++-----
.../range.as.const/adaptor.pass.cpp | 156 ++++++++
.../range.as.const/base.pass.cpp | 78 ++++
.../range.as.const/begin.pass.cpp | 124 +++++++
.../range.as.const/ctad.compile.pass.cpp | 22 ++
.../range.as.const/ctor.pass.cpp | 57 +++
.../enable_borrowed_range.compile.pass.cpp | 16 +
.../range.as.const/end.pass.cpp | 129 +++++++
.../range.as.const/size.pass.cpp | 80 ++++
.../view.interface/view.interface.pass.cpp | 22 +-
libcxx/test/support/test_iterators.h | 7 +
libcxx/test/support/test_macros.h | 6 +
.../generate_feature_test_macro_components.py | 4 +-
61 files changed, 3248 insertions(+), 946 deletions(-)
create mode 100644 libcxx/include/__iterator/const_iterator.h
create mode 100644 libcxx/include/__ranges/as_const_view.h
create mode 100644 libcxx/include/__ranges/const_access.h
delete mode 100644 libcxx/include/__ranges/data.h
create mode 100644 libcxx/test/std/iterators/const.iterators/alias.pass.cpp
create mode 100644 libcxx/test/std/iterators/const.iterators/iterator.pass.cpp
create mode 100644 libcxx/test/std/ranges/range.access/cbegin.pass.cpp
create mode 100644 libcxx/test/std/ranges/range.access/cbegin.verify.cpp
create mode 100644 libcxx/test/std/ranges/range.access/cend.pass.cpp
create mode 100644 libcxx/test/std/ranges/range.access/cend.verify.cpp
create mode 100644 libcxx/test/std/ranges/range.adaptors/range.as.const/adaptor.pass.cpp
create mode 100644 libcxx/test/std/ranges/range.adaptors/range.as.const/base.pass.cpp
create mode 100644 libcxx/test/std/ranges/range.adaptors/range.as.const/begin.pass.cpp
create mode 100644 libcxx/test/std/ranges/range.adaptors/range.as.const/ctad.compile.pass.cpp
create mode 100644 libcxx/test/std/ranges/range.adaptors/range.as.const/ctor.pass.cpp
create mode 100644 libcxx/test/std/ranges/range.adaptors/range.as.const/enable_borrowed_range.compile.pass.cpp
create mode 100644 libcxx/test/std/ranges/range.adaptors/range.as.const/end.pass.cpp
create mode 100644 libcxx/test/std/ranges/range.adaptors/range.as.const/size.pass.cpp
diff --git a/libcxx/docs/FeatureTestMacroTable.rst b/libcxx/docs/FeatureTestMacroTable.rst
index c909a4300db1a6..bc4ffa3d71c66a 100644
--- a/libcxx/docs/FeatureTestMacroTable.rst
+++ b/libcxx/docs/FeatureTestMacroTable.rst
@@ -352,7 +352,7 @@ Status
---------------------------------------------------------- -----------------
``__cpp_lib_ranges`` ``202406L``
---------------------------------------------------------- -----------------
- ``__cpp_lib_ranges_as_const`` *unimplemented*
+ ``__cpp_lib_ranges_as_const`` ``202311L``
---------------------------------------------------------- -----------------
``__cpp_lib_ranges_as_rvalue`` ``202207L``
---------------------------------------------------------- -----------------
diff --git a/libcxx/docs/Status/Cxx23Issues.csv b/libcxx/docs/Status/Cxx23Issues.csv
index da4cce6eac0c90..6c4deb4d4ad9df 100644
--- a/libcxx/docs/Status/Cxx23Issues.csv
+++ b/libcxx/docs/Status/Cxx23Issues.csv
@@ -219,9 +219,9 @@
"`LWG3761 <https://wg21.link/LWG3761>`__","``cartesian_product_view::iterator::operator-`` should pass by reference","2022-11 (Kona)","","",""
"`LWG3762 <https://wg21.link/LWG3762>`__","``generator::iterator::operator==`` should pass by reference","2022-11 (Kona)","","",""
"`LWG3764 <https://wg21.link/LWG3764>`__","``reference_wrapper::operator()`` should propagate noexcept","2022-11 (Kona)","|Complete|","17.0",""
-"`LWG3765 <https://wg21.link/LWG3765>`__","``const_sentinel`` should be constrained","2022-11 (Kona)","","",""
-"`LWG3766 <https://wg21.link/LWG3766>`__","``view_interface::cbegin`` is underconstrained","2022-11 (Kona)","","",""
-"`LWG3770 <https://wg21.link/LWG3770>`__","``const_sentinel_t`` is missing","2022-11 (Kona)","","",""
+"`LWG3765 <https://wg21.link/LWG3765>`__","``const_sentinel`` should be constrained","2022-11 (Kona)","|Complete|","20.0",""
+"`LWG3766 <https://wg21.link/LWG3766>`__","``view_interface::cbegin`` is underconstrained","2022-11 (Kona)","|Complete|","20.0",""
+"`LWG3770 <https://wg21.link/LWG3770>`__","``const_sentinel_t`` is missing","2022-11 (Kona)","|Complete|","20.0",""
"`LWG3773 <https://wg21.link/LWG3773>`__","``views::zip_transform`` still requires ``F`` to be ``copy_constructible`` when empty pack","2022-11 (Kona)","","",""
"`LWG3774 <https://wg21.link/LWG3774>`__","``<flat_set>`` should include ``<compare>``","2022-11 (Kona)","","",""
"`LWG3775 <https://wg21.link/LWG3775>`__","Broken dependencies in the ``Cpp17Allocator`` requirements","2022-11 (Kona)","","",""
@@ -252,7 +252,7 @@
"`LWG3664 <https://wg21.link/LWG3664>`__","`LWG 3392 <https://wg21.link/LWG3392>`__ ``broke std::ranges::distance(a, a+3)``","2023-02 (Issaquah)","","",""
"`LWG3720 <https://wg21.link/LWG3720>`__","Restrict the valid types of ``arg-id`` for width and precision in ``std-format-spec``","2023-02 (Issaquah)","|Complete|","17.0",""
"`LWG3756 <https://wg21.link/LWG3756>`__","Is the ``std::atomic_flag`` class signal-safe?","2023-02 (Issaquah)","","",""
-"`LWG3769 <https://wg21.link/LWG3769>`__","``basic_const_iterator::operator==`` causes infinite constraint recursion","2023-02 (Issaquah)","","",""
+"`LWG3769 <https://wg21.link/LWG3769>`__","``basic_const_iterator::operator==`` causes infinite constraint recursion","2023-02 (Issaquah)","|Complete|","20.0",""
"`LWG3807 <https://wg21.link/LWG3807>`__","The feature test macro for ``ranges::find_last`` should be renamed","2023-02 (Issaquah)","","",""
"`LWG3811 <https://wg21.link/LWG3811>`__","``views::as_const`` on ``ref_view<T>`` should return ``ref_view<const T>``","2023-02 (Issaquah)","","",""
"`LWG3820 <https://wg21.link/LWG3820>`__","``cartesian_product_view::iterator::prev`` is not quite right","2023-02 (Issaquah)","","",""
@@ -271,7 +271,7 @@
"`LWG3849 <https://wg21.link/LWG3849>`__","``cartesian_product_view::iterator``'s default constructor is overconstrained","2023-02 (Issaquah)","","",""
"`LWG3850 <https://wg21.link/LWG3850>`__","``views::as_const`` on ``empty_view<T>`` should return ``empty_view<const T>``","2023-02 (Issaquah)","","",""
"`LWG3851 <https://wg21.link/LWG3851>`__","``chunk_view::inner-iterator`` missing custom ``iter_move`` and ``iter_swap``","2023-02 (Issaquah)","","",""
-"`LWG3853 <https://wg21.link/LWG3853>`__","``basic_const_iterator<volatile int*>::operator->`` is ill-formed","2023-02 (Issaquah)","","",""
+"`LWG3853 <https://wg21.link/LWG3853>`__","``basic_const_iterator<volatile int*>::operator->`` is ill-formed","2023-02 (Issaquah)","|Complete|","20.0",""
"`LWG3857 <https://wg21.link/LWG3857>`__","``basic_string_view`` should allow explicit conversion when only traits vary","2023-02 (Issaquah)","|Complete|","17.0",""
"`LWG3860 <https://wg21.link/LWG3860>`__","``range_common_reference_t`` is missing","2023-02 (Issaquah)","|Complete|","17.0",""
"`LWG3866 <https://wg21.link/LWG3866>`__","Bad Mandates for ``expected::transform_error`` overloads","2023-02 (Issaquah)","|Complete|","17.0",""
@@ -293,12 +293,12 @@
"`LWG3836 <https://wg21.link/LWG3836>`__","``std::expected<bool, E1>`` conversion constructor ``expected(const expected<U, G>&)`` should take precedence over ``expected(U&&)`` with operator ``bool``","2023-02 (Issaquah)","|Complete|","18.0",""
"`LWG3843 <https://wg21.link/LWG3843>`__","``std::expected<T,E>::value() &`` assumes ``E`` is copy constructible","2023-02 (Issaquah)","|Complete|","17.0",""
"`LWG3847 <https://wg21.link/LWG3847>`__","``ranges::to`` can still return views","2023-02 (Issaquah)","|Complete|","17.0",""
-"`LWG3862 <https://wg21.link/LWG3862>`__","``basic_const_iterator``'s ``common_type`` specialization is underconstrained","2023-02 (Issaquah)","","",""
+"`LWG3862 <https://wg21.link/LWG3862>`__","``basic_const_iterator``'s ``common_type`` specialization is underconstrained","2023-02 (Issaquah)","|Complete|","20.0",""
"`LWG3865 <https://wg21.link/LWG3865>`__","Sorting a range of ``pairs``","2023-02 (Issaquah)","|Complete|","17.0",""
"`LWG3869 <https://wg21.link/LWG3869>`__","Deprecate ``std::errc`` constants related to UNIX STREAMS","2023-02 (Issaquah)","|Complete|","19.0",""
"`LWG3870 <https://wg21.link/LWG3870>`__","Remove ``voidify``","2023-02 (Issaquah)","","",""
"`LWG3871 <https://wg21.link/LWG3871>`__","Adjust note about ``terminate``","2023-02 (Issaquah)","","",""
-"`LWG3872 <https://wg21.link/LWG3872>`__","``basic_const_iterator`` should have custom ``iter_move``","2023-02 (Issaquah)","","",""
+"`LWG3872 <https://wg21.link/LWG3872>`__","``basic_const_iterator`` should have custom ``iter_move``","2023-02 (Issaquah)","|Complete|","20.0",""
"`LWG3875 <https://wg21.link/LWG3875>`__","``std::ranges::repeat_view<T, IntegerClass>::iterator`` may be ill-formed","2023-02 (Issaquah)","|Complete|","17.0",""
"`LWG3876 <https://wg21.link/LWG3876>`__","Default constructor of ``std::layout_XX::mapping`` misses precondition","2023-02 (Issaquah)","","",""
"`LWG3877 <https://wg21.link/LWG3877>`__","Incorrect constraints on ``const``-qualified monadic overloads for ``std::expected``","2023-02 (Issaquah)","|Complete|","17.0",""
diff --git a/libcxx/docs/Status/Cxx23Papers.csv b/libcxx/docs/Status/Cxx23Papers.csv
index 2c8a91d8401b53..4547d0ec5a10ad 100644
--- a/libcxx/docs/Status/Cxx23Papers.csv
+++ b/libcxx/docs/Status/Cxx23Papers.csv
@@ -61,7 +61,7 @@
"`P1899R3 <https://wg21.link/P1899R3>`__","``stride_view``","2022-07 (Virtual)","","",""
"`P2093R14 <https://wg21.link/P2093R14>`__","Formatted output","2022-07 (Virtual)","|Complete|","18.0",""
"`P2165R4 <https://wg21.link/P2165R4>`__","Compatibility between ``tuple``, ``pair`` and ``tuple-like`` objects","2022-07 (Virtual)","","",""
-"`P2278R4 <https://wg21.link/P2278R4>`__","``cbegin`` should always return a constant iterator","2022-07 (Virtual)","","",""
+"`P2278R4 <https://wg21.link/P2278R4>`__","``cbegin`` should always return a constant iterator","2022-07 (Virtual)","|Complete|","20.0",""
"`P2286R8 <https://wg21.link/P2286R8>`__","Formatting Ranges","2022-07 (Virtual)","|Complete|","16.0",""
"`P2291R3 <https://wg21.link/P2291R3>`__","Add Constexpr Modifiers to Functions ``to_chars`` and ``from_chars`` for Integral Types in ``<charconv>`` Header","2022-07 (Virtual)","|Complete|","16.0",""
"`P2302R4 <https://wg21.link/P2302R4>`__","``std::ranges::contains``","2022-07 (Virtual)","|Complete|","19.0",""
diff --git a/libcxx/docs/Status/Cxx2cIssues.csv b/libcxx/docs/Status/Cxx2cIssues.csv
index 14633265a42251..bcb046bd6d2801 100644
--- a/libcxx/docs/Status/Cxx2cIssues.csv
+++ b/libcxx/docs/Status/Cxx2cIssues.csv
@@ -25,9 +25,9 @@
"`LWG3809 <https://wg21.link/LWG3809>`__","Is ``std::subtract_with_carry_engine<uint16_t>`` supposed to work","2023-11 (Kona)","","",""
"`LWG3892 <https://wg21.link/LWG3892>`__","Incorrect formatting of nested ranges and tuples","2023-11 (Kona)","|Complete|","17.0",""
"`LWG3897 <https://wg21.link/LWG3897>`__","``inout_ptr`` will not update raw pointer to 0","2023-11 (Kona)","|Complete|","19.0",""
-"`LWG3946 <https://wg21.link/LWG3946>`__","The definition of ``const_iterator_t`` should be reworked","2023-11 (Kona)","","",""
+"`LWG3946 <https://wg21.link/LWG3946>`__","The definition of ``const_iterator_t`` should be reworked","2023-11 (Kona)","|Complete|","20.0",""
"`LWG3947 <https://wg21.link/LWG3947>`__","Unexpected constraints on ``adjacent_transform_view::base()``","2023-11 (Kona)","","",""
-"`LWG3948 <https://wg21.link/LWG3948>`__","``possibly-const-range and as-const-pointer`` should be ``noexcept``","2023-11 (Kona)","","",""
+"`LWG3948 <https://wg21.link/LWG3948>`__","``possibly-const-range and as-const-pointer`` should be ``noexcept``","2023-11 (Kona)","|Complete|","20.0",""
"`LWG3949 <https://wg21.link/LWG3949>`__","``std::atomic<bool>``'s trivial destructor dropped in C++17 spec wording","2023-11 (Kona)","","",""
"`LWG3951 <https://wg21.link/LWG3951>`__","[expected.object.swap]: Using ``value()`` instead of ``has_value()``","2023-11 (Kona)","|Complete|","16.0",""
"`LWG3953 <https://wg21.link/LWG3953>`__","``iter_move`` for ``common_iterator`` and ``counted_iterator`` should return ``decltype(auto)``","2023-11 (Kona)","","",""
diff --git a/libcxx/docs/Status/Cxx2cPapers.csv b/libcxx/docs/Status/Cxx2cPapers.csv
index 8864b1ebe28891..328586e1a027c9 100644
--- a/libcxx/docs/Status/Cxx2cPapers.csv
+++ b/libcxx/docs/Status/Cxx2cPapers.csv
@@ -42,7 +42,7 @@
"`P2819R2 <https://wg21.link/P2819R2>`__","Add tuple protocol to complex","2023-11 (Kona)","|Complete|","19.0",""
"`P2937R0 <https://wg21.link/P2937R0>`__","Freestanding: Remove ``strtok``","2023-11 (Kona)","","",""
"`P2833R2 <https://wg21.link/P2833R2>`__","Freestanding Library: inout expected span","2023-11 (Kona)","","",""
-"`P2836R1 <https://wg21.link/P2836R1>`__","``std::basic_const_iterator`` should follow its underlying type's convertibility","2023-11 (Kona)","","",""
+"`P2836R1 <https://wg21.link/P2836R1>`__","``std::basic_const_iterator`` should follow its underlying type's convertibility","2023-11 (Kona)","|Complete|","20.0","Implemented as a DR against C++23. (MSVC STL and libstdc++ will do the same.)"
"`P2264R7 <https://wg21.link/P2264R7>`__","Make ``assert()`` macro user friendly for C and C++","2023-11 (Kona)","","",""
"`P1673R13 <https://wg21.link/P1673R13>`__","A free function linear algebra interface based on the BLAS","2023-11 (Kona)","","",""
"","","","","",""
diff --git a/libcxx/include/CMakeLists.txt b/libcxx/include/CMakeLists.txt
index 32579272858a8e..99d8b22281a777 100644
--- a/libcxx/include/CMakeLists.txt
+++ b/libcxx/include/CMakeLists.txt
@@ -444,6 +444,7 @@ set(files
__iterator/bounded_iter.h
__iterator/common_iterator.h
__iterator/concepts.h
+ __iterator/const_iterator.h
__iterator/counted_iterator.h
__iterator/cpp17_iterator_concepts.h
__iterator/data.h
@@ -635,14 +636,15 @@ set(files
__random/weibull_distribution.h
__ranges/access.h
__ranges/all.h
+ __ranges/as_const_view.h
__ranges/as_rvalue_view.h
__ranges/chunk_by_view.h
__ranges/common_view.h
__ranges/concepts.h
+ __ranges/const_access.h
__ranges/container_compatible_range.h
__ranges/counted.h
__ranges/dangling.h
- __ranges/data.h
__ranges/drop_view.h
__ranges/drop_while_view.h
__ranges/elements_view.h
diff --git a/libcxx/include/__algorithm/ranges_reverse_copy.h b/libcxx/include/__algorithm/ranges_reverse_copy.h
index e5ca5cf652dc4d..c290fd24946fbe 100644
--- a/libcxx/include/__algorithm/ranges_reverse_copy.h
+++ b/libcxx/include/__algorithm/ranges_reverse_copy.h
@@ -34,6 +34,14 @@ _LIBCPP_BEGIN_NAMESPACE_STD
namespace ranges {
+template <ranges::bidirectional_range _Range>
+_LIBCPP_HIDE_FROM_ABI constexpr ranges::subrange<reverse_iterator<ranges::iterator_t<_Range>>,
+ reverse_iterator<ranges::iterator_t<_Range>>>
+__reverse_range(_Range&& __range) {
+ auto __first = ranges::begin(__range);
+ return {std::make_reverse_iterator(ranges::next(__first, ranges::end(__range))), std::make_reverse_iterator(__first)};
+}
+
template <class _InIter, class _OutIter>
using reverse_copy_result = in_out_result<_InIter, _OutIter>;
@@ -49,7 +57,7 @@ struct __reverse_copy {
requires indirectly_copyable<iterator_t<_Range>, _OutIter>
_LIBCPP_HIDE_FROM_ABI constexpr reverse_copy_result<borrowed_iterator_t<_Range>, _OutIter>
operator()(_Range&& __range, _OutIter __result) const {
- auto __ret = ranges::copy(std::__reverse_range(__range), std::move(__result));
+ auto __ret = ranges::copy(ranges::__reverse_range(__range), std::move(__result));
return {ranges::next(ranges::begin(__range), ranges::end(__range)), std::move(__ret.out)};
}
};
diff --git a/libcxx/include/__format/range_default_formatter.h b/libcxx/include/__format/range_default_formatter.h
index fb21b0f8beb3a1..c0515892b12be9 100644
--- a/libcxx/include/__format/range_default_formatter.h
+++ b/libcxx/include/__format/range_default_formatter.h
@@ -22,8 +22,8 @@
#include <__format/formatter.h>
#include <__format/range_formatter.h>
#include <__iterator/back_insert_iterator.h>
+#include <__ranges/access.h>
#include <__ranges/concepts.h>
-#include <__ranges/data.h>
#include <__ranges/from_range.h>
#include <__ranges/size.h>
#include <__type_traits/conditional.h>
diff --git a/libcxx/include/__format/range_formatter.h b/libcxx/include/__format/range_formatter.h
index def55c86ce51cd..c7a07727dee2ef 100644
--- a/libcxx/include/__format/range_formatter.h
+++ b/libcxx/include/__format/range_formatter.h
@@ -26,8 +26,8 @@
#include <__format/formatter_output.h>
#include <__format/parser_std_format_spec.h>
#include <__iterator/back_insert_iterator.h>
+#include <__ranges/access.h>
#include <__ranges/concepts.h>
-#include <__ranges/data.h>
#include <__ranges/from_range.h>
#include <__ranges/size.h>
#include <__type_traits/remove_cvref.h>
diff --git a/libcxx/include/__iterator/const_iterator.h b/libcxx/include/__iterator/const_iterator.h
new file mode 100644
index 00000000000000..4fcd76b4117dc6
--- /dev/null
+++ b/libcxx/include/__iterator/const_iterator.h
@@ -0,0 +1,351 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ITERATOR_CONST_ITERATOR_H
+#define _LIBCPP___ITERATOR_CONST_ITERATOR_H
+
+#include <__compare/three_way_comparable.h>
+#include <__concepts/common_with.h>
+#include <__concepts/convertible_to.h>
+#include <__concepts/different_from.h>
+#include <__concepts/same_as.h>
+#include <__concepts/semiregular.h>
+#include <__concepts/totally_ordered.h>
+#include <__iterator/concepts.h>
+#include <__iterator/incrementable_traits.h>
+#include <__iterator/iter_move.h>
+#include <__iterator/iterator_traits.h>
+#include <__memory/addressof.h>
+#include <__memory/pointer_traits.h>
+#include <__type_traits/common_reference.h>
+#include <__type_traits/common_type.h>
+#include <__type_traits/conditional.h>
+#include <__type_traits/integral_constant.h>
+#include <__type_traits/is_reference.h>
+#include <__type_traits/is_specialization.h>
+#include <__utility/forward.h>
+#include <__utility/move.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+# pragma GCC system_header
+#endif
+
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if _LIBCPP_STD_VER >= 23
+
+template <indirectly_readable _Iter>
+using iter_const_reference_t = common_reference_t<const iter_value_t<_Iter>&&, iter_reference_t<_Iter>>;
+
+template <class _Iter>
+concept __constant_iterator = input_iterator<_Iter> && same_as<iter_const_reference_t<_Iter>, iter_reference_t<_Iter>>;
+
+template <input_iterator _Iter>
+class basic_const_iterator;
+
+template <input_iterator _Iter>
+using const_iterator = conditional_t<__constant_iterator<_Iter>, _Iter, basic_const_iterator<_Iter>>;
+
+// This doesn't use `conditional_t` to avoid instantiating const_iterator<_Sent> when _Sent is not an input_iterator.
+template <class _Sent>
+struct __const_sentinel_impl {
+ using type = _Sent;
+};
+template <class _Sent>
+ requires input_iterator<_Sent>
+struct __const_sentinel_impl<_Sent> {
+ using type = const_iterator<_Sent>;
+};
+template <semiregular _Sent>
+using const_sentinel = __const_sentinel_impl<_Sent>::type;
+
+template <class _Iter>
+concept __not_a_const_iterator = !__is_specialization_v<_Iter, basic_const_iterator>;
+
+template <indirectly_readable _Iter>
+using __iter_const_rvalue_reference_t = common_reference_t<const iter_value_t<_Iter>&&, iter_rvalue_reference_t<_Iter>>;
+
+template <class _Iter>
+struct __basic_const_iterator_concept {
+ // clang-format off
+ using iterator_concept =
+ conditional_t<contiguous_iterator<_Iter>,
+ contiguous_iterator_tag,
+ conditional_t<random_access_iterator<_Iter>,
+ random_access_iterator_tag,
+ conditional_t<bidirectional_iterator<_Iter>,
+ bidirectional_iterator_tag,
+ conditional_t<forward_iterator<_Iter>,
+ forward_iterator_tag,
+ // else
+ input_iterator_tag>>>>;
+ // clang-format on
+};
+
+template <class _Iter>
+struct __basic_const_iterator_category : __basic_const_iterator_concept<_Iter> {};
+template <forward_iterator _Iter>
+struct __basic_const_iterator_category<_Iter> : __basic_const_iterator_concept<_Iter> {
+ using iterator_category = std::iterator_traits<_Iter>::iterator_category;
+};
+
+template <input_iterator _Iter>
+class _LIBCPP_TEMPLATE_VIS basic_const_iterator : public __basic_const_iterator_category<_Iter> {
+ _Iter __current_ = _Iter();
+
+ using __reference = iter_const_reference_t<_Iter>;
+ using __rvalue_reference = __iter_const_rvalue_reference_t<_Iter>;
+
+public:
+ using value_type = iter_value_t<_Iter>;
+ using difference_type = iter_difference_t<_Iter>;
+
+ _LIBCPP_HIDE_FROM_ABI basic_const_iterator()
+ requires default_initializable<_Iter>
+ = default;
+
+ _LIBCPP_HIDE_FROM_ABI constexpr basic_const_iterator(_Iter __cur) : __current_(std::move(__cur)) {}
+ template <convertible_to<_Iter> _Type>
+ _LIBCPP_HIDE_FROM_ABI constexpr basic_const_iterator(basic_const_iterator<_Type> __cur)
+ : __current_(std::move(__cur.__current_)) {}
+ template <__different_from<basic_const_iterator> _Type>
+ requires convertible_to<_Type, _Iter>
+ _LIBCPP_HIDE_FROM_ABI constexpr basic_const_iterator(_Type&& __cur) : __current_(std::forward<_Type>(__cur)) {}
+
+ _LIBCPP_HIDE_FROM_ABI constexpr const _Iter& base() const& noexcept { return __current_; }
+ _LIBCPP_HIDE_FROM_ABI constexpr _Iter base() && { return std::move(__current_); }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr __reference operator*() const { return static_cast<__reference>(*__current_); }
+ _LIBCPP_HIDE_FROM_ABI constexpr const auto* operator->() const
+ requires is_lvalue_reference_v<iter_reference_t<_Iter>> &&
+ same_as<remove_cvref_t<iter_reference_t<_Iter>>, value_type>
+ {
+ if constexpr (contiguous_iterator<_Iter>) {
+ return std::to_address(__current_);
+ } else {
+ return std::addressof(*__current_);
+ }
+ }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr basic_const_iterator& operator++() {
+ ++__current_;
+ return *this;
+ }
+ _LIBCPP_HIDE_FROM_ABI constexpr void operator++(int) { ++__current_; }
+ _LIBCPP_HIDE_FROM_ABI constexpr basic_const_iterator operator++(int)
+ requires forward_iterator<_Iter>
+ {
+ auto __tmp = *this;
+ ++__current_;
+ return __tmp;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr basic_const_iterator& operator--()
+ requires bidirectional_iterator<_Iter>
+ {
+ --__current_;
+ return *this;
+ }
+ _LIBCPP_HIDE_FROM_ABI constexpr basic_const_iterator operator--(int)
+ requires bidirectional_iterator<_Iter>
+ {
+ auto __tmp = *this;
+ --__current_;
+ return __tmp;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr basic_const_iterator& operator+=(difference_type __n)
+ requires random_access_iterator<_Iter>
+ {
+ __current_ += __n;
+ return *this;
+ }
+ _LIBCPP_HIDE_FROM_ABI constexpr basic_const_iterator& operator-=(difference_type __n)
+ requires random_access_iterator<_Iter>
+ {
+ __current_ -= __n;
+ return *this;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr __reference operator[](difference_type __n) const
+ requires random_access_iterator<_Iter>
+ {
+ return static_cast<__reference>(__current_[__n]);
+ }
+
+ template <sentinel_for<_Iter> _Sent>
+ _LIBCPP_HIDE_FROM_ABI constexpr bool operator==(const _Sent& __sent) const {
+ return __current_ == __sent;
+ }
+
+ template <__not_a_const_iterator _ConstIt>
+ requires __constant_iterator<_ConstIt> && convertible_to<_Iter const&, _ConstIt>
+ _LIBCPP_HIDE_FROM_ABI constexpr operator _ConstIt() const& {
+ return __current_;
+ }
+ template <__not_a_const_iterator _ConstIt>
+ requires __constant_iterator<_ConstIt> && convertible_to<_Iter, _ConstIt>
+ _LIBCPP_HIDE_FROM_ABI constexpr operator _ConstIt() && {
+ return std::move(__current_);
+ }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr bool operator<(const basic_const_iterator& __rhs) const
+ requires random_access_iterator<_Iter>
+ {
+ return __current_ < __rhs.__current_;
+ }
+ _LIBCPP_HIDE_FROM_ABI constexpr bool operator>(const basic_const_iterator& __rhs) const
+ requires random_access_iterator<_Iter>
+ {
+ return __current_ > __rhs.__current_;
+ }
+ _LIBCPP_HIDE_FROM_ABI constexpr bool operator<=(const basic_const_iterator& __rhs) const
+ requires random_access_iterator<_Iter>
+ {
+ return __current_ <= __rhs.__current_;
+ }
+ _LIBCPP_HIDE_FROM_ABI constexpr bool operator>=(const basic_const_iterator& __rhs) const
+ requires random_access_iterator<_Iter>
+ {
+ return __current_ >= __rhs.__current_;
+ }
+ _LIBCPP_HIDE_FROM_ABI constexpr auto operator<=>(const basic_const_iterator& __rhs) const
+ requires random_access_iterator<_Iter> && three_way_comparable<_Iter>
+ {
+ return __current_ <=> __rhs.__current_;
+ }
+
+ template <__different_from<basic_const_iterator> _Iter2>
+ _LIBCPP_HIDE_FROM_ABI constexpr bool operator<(const _Iter2& __rhs) const
+ requires random_access_iterator<_Iter> && totally_ordered_with<_Iter, _Iter2>
+ {
+ return __current_ < __rhs;
+ }
+ template <__different_from<basic_const_iterator> _Iter2>
+ _LIBCPP_HIDE_FROM_ABI constexpr bool operator>(const _Iter2& __rhs) const
+ requires random_access_iterator<_Iter> && totally_ordered_with<_Iter, _Iter2>
+ {
+ return __current_ > __rhs;
+ }
+ template <__different_from<basic_const_iterator> _Iter2>
+ _LIBCPP_HIDE_FROM_ABI constexpr bool operator<=(const _Iter2& __rhs) const
+ requires random_access_iterator<_Iter> && totally_ordered_with<_Iter, _Iter2>
+ {
+ return __current_ <= __rhs;
+ }
+ template <__different_from<basic_const_iterator> _Iter2>
+ _LIBCPP_HIDE_FROM_ABI constexpr bool operator>=(const _Iter2& __rhs) const
+ requires random_access_iterator<_Iter> && totally_ordered_with<_Iter, _Iter2>
+ {
+ return __current_ >= __rhs;
+ }
+ template <__different_from<basic_const_iterator> _Iter2>
+ _LIBCPP_HIDE_FROM_ABI constexpr auto operator<=>(const _Iter2& __rhs) const
+ requires random_access_iterator<_Iter> && totally_ordered_with<_Iter, _Iter2> &&
+ three_way_comparable_with<_Iter, _Iter2>
+ {
+ return __current_ <=> __rhs;
+ }
+
+ template <__not_a_const_iterator _Iter2>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr bool operator<(const _Iter2& __lhs, const basic_const_iterator& __rhs)
+ requires random_access_iterator<_Iter> && totally_ordered_with<_Iter, _Iter2>
+ {
+ return __lhs < __rhs.__current_;
+ }
+ template <__not_a_const_iterator _Iter2>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr bool operator>(const _Iter2& __lhs, const basic_const_iterator& __rhs)
+ requires random_access_iterator<_Iter> && totally_ordered_with<_Iter, _Iter2>
+ {
+ return __lhs > __rhs.__current_;
+ }
+ template <__not_a_const_iterator _Iter2>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr bool operator<=(const _Iter2& __lhs, const basic_const_iterator& __rhs)
+ requires random_access_iterator<_Iter> && totally_ordered_with<_Iter, _Iter2>
+ {
+ return __lhs <= __rhs.__current_;
+ }
+ template <__not_a_const_iterator _Iter2>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr bool operator>=(const _Iter2& __lhs, const basic_const_iterator& __rhs)
+ requires random_access_iterator<_Iter> && totally_ordered_with<_Iter, _Iter2>
+ {
+ return __lhs >= __rhs.__current_;
+ }
+
+ friend _LIBCPP_HIDE_FROM_ABI constexpr basic_const_iterator
+ operator+(const basic_const_iterator& __it, difference_type __n)
+ requires random_access_iterator<_Iter>
+ {
+ return basic_const_iterator(__it.__current_ + __n);
+ }
+ friend _LIBCPP_HIDE_FROM_ABI constexpr basic_const_iterator
+ operator+(difference_type __n, const basic_const_iterator& __it)
+ requires random_access_iterator<_Iter>
+ {
+ return basic_const_iterator(__it.__current_ + __n);
+ }
+
+ friend _LIBCPP_HIDE_FROM_ABI constexpr basic_const_iterator
+ operator-(const basic_const_iterator& __it, difference_type __n)
+ requires random_access_iterator<_Iter>
+ {
+ return basic_const_iterator(__it.__current_ - __n);
+ }
+ template <sized_sentinel_for<_Iter> _Sent>
+ _LIBCPP_HIDE_FROM_ABI constexpr difference_type operator-(const _Sent& __rhs) const {
+ return __current_ - __rhs;
+ }
+ template <__not_a_const_iterator _Sent>
+ requires sized_sentinel_for<_Sent, _Iter>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr difference_type
+ operator-(const _Sent& __lhs, const basic_const_iterator& __rhs) {
+ return __lhs - __rhs;
+ }
+
+ friend _LIBCPP_HIDE_FROM_ABI constexpr __rvalue_reference iter_move(const basic_const_iterator& __it) noexcept(
+ noexcept(static_cast<__rvalue_reference>(ranges::iter_move(__it.__current_)))) {
+ return static_cast<__rvalue_reference>(ranges::iter_move(__it.__current_));
+ }
+};
+
+template <class _Type1, common_with<_Type1> _Type2>
+ requires input_iterator<common_type_t<_Type1, _Type2>>
+struct common_type<basic_const_iterator<_Type1>, _Type2> {
+ using type = basic_const_iterator<common_type_t<_Type1, _Type2>>;
+};
+template <class _Type1, common_with<_Type1> _Type2>
+ requires input_iterator<common_type_t<_Type1, _Type2>>
+struct common_type<_Type2, basic_const_iterator<_Type1>> {
+ using type = basic_const_iterator<common_type_t<_Type1, _Type2>>;
+};
+template <class _Type1, common_with<_Type1> _Type2>
+ requires input_iterator<common_type_t<_Type1, _Type2>>
+struct common_type<basic_const_iterator<_Type1>, basic_const_iterator<_Type2>> {
+ using type = basic_const_iterator<common_type_t<_Type1, _Type2>>;
+};
+
+template <input_iterator _Iter>
+_LIBCPP_HIDE_FROM_ABI constexpr const_iterator<_Iter> make_const_iterator(_Iter __it) {
+ return __it;
+}
+template <semiregular _Sent>
+_LIBCPP_HIDE_FROM_ABI constexpr const_sentinel<_Sent> make_const_sentinel(_Sent __sent) {
+ return __sent;
+}
+
+#endif // _LIBCPP_STD_VER >= 23
+
+_LIBCPP_END_NAMESPACE_STD
+
+_LIBCPP_POP_MACROS
+
+#endif // _LIBCPP___ITERATOR_CONST_ITERATOR_H
diff --git a/libcxx/include/__iterator/reverse_iterator.h b/libcxx/include/__iterator/reverse_iterator.h
index 50c0f21eaa286b..823203cadf7e18 100644
--- a/libcxx/include/__iterator/reverse_iterator.h
+++ b/libcxx/include/__iterator/reverse_iterator.h
@@ -27,9 +27,6 @@
#include <__iterator/readable_traits.h>
#include <__iterator/segmented_iterator.h>
#include <__memory/addressof.h>
-#include <__ranges/access.h>
-#include <__ranges/concepts.h>
-#include <__ranges/subrange.h>
#include <__type_traits/conditional.h>
#include <__type_traits/enable_if.h>
#include <__type_traits/is_assignable.h>
@@ -315,16 +312,6 @@ inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 reverse_iterator<_Ite
}
#endif
-#if _LIBCPP_STD_VER >= 20
-template <ranges::bidirectional_range _Range>
-_LIBCPP_HIDE_FROM_ABI constexpr ranges::subrange<reverse_iterator<ranges::iterator_t<_Range>>,
- reverse_iterator<ranges::iterator_t<_Range>>>
-__reverse_range(_Range&& __range) {
- auto __first = ranges::begin(__range);
- return {std::make_reverse_iterator(ranges::next(__first, ranges::end(__range))), std::make_reverse_iterator(__first)};
-}
-#endif
-
template <class _Iter, bool __b>
struct __unwrap_iter_impl<reverse_iterator<reverse_iterator<_Iter> >, __b> {
using _UnwrappedIter = decltype(__unwrap_iter_impl<_Iter>::__unwrap(std::declval<_Iter>()));
diff --git a/libcxx/include/__ranges/access.h b/libcxx/include/__ranges/access.h
index c0a40c5e10178a..251898128f078d 100644
--- a/libcxx/include/__ranges/access.h
+++ b/libcxx/include/__ranges/access.h
@@ -14,10 +14,13 @@
#include <__config>
#include <__iterator/concepts.h>
#include <__iterator/readable_traits.h>
+#include <__memory/pointer_traits.h>
#include <__ranges/enable_borrowed_range.h>
#include <__type_traits/decay.h>
+#include <__type_traits/is_pointer.h>
#include <__type_traits/is_reference.h>
#include <__type_traits/remove_cvref.h>
+#include <__type_traits/remove_pointer.h>
#include <__type_traits/remove_reference.h>
#include <__utility/auto_cast.h>
#include <__utility/declval.h>
@@ -148,58 +151,39 @@ inline constexpr auto end = __end::__fn{};
} // namespace __cpo
} // namespace ranges
-// [range.access.cbegin]
+// [range.prim.data]
namespace ranges {
-namespace __cbegin {
-struct __fn {
- template <class _Tp>
- requires is_lvalue_reference_v<_Tp&&>
- [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
- noexcept(noexcept(ranges::begin(static_cast<const remove_reference_t<_Tp>&>(__t))))
- -> decltype(ranges::begin(static_cast<const remove_reference_t<_Tp>&>(__t))) {
- return ranges::begin(static_cast<const remove_reference_t<_Tp>&>(__t));
- }
+namespace __data {
+template <class _Tp>
+concept __ptr_to_object = is_pointer_v<_Tp> && is_object_v<remove_pointer_t<_Tp>>;
- template <class _Tp>
- requires is_rvalue_reference_v<_Tp&&>
- [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
- noexcept(noexcept(ranges::begin(static_cast<const _Tp&&>(__t))))
- -> decltype(ranges::begin(static_cast<const _Tp&&>(__t))) {
- return ranges::begin(static_cast<const _Tp&&>(__t));
- }
+template <class _Tp>
+concept __member_data = __can_borrow<_Tp> && requires(_Tp&& __t) {
+ { _LIBCPP_AUTO_CAST(__t.data()) } -> __ptr_to_object;
};
-} // namespace __cbegin
-inline namespace __cpo {
-inline constexpr auto cbegin = __cbegin::__fn{};
-} // namespace __cpo
-} // namespace ranges
-
-// [range.access.cend]
+template <class _Tp>
+concept __ranges_begin_invocable = !__member_data<_Tp> && __can_borrow<_Tp> && requires(_Tp&& __t) {
+ { ranges::begin(__t) } -> contiguous_iterator;
+};
-namespace ranges {
-namespace __cend {
struct __fn {
- template <class _Tp>
- requires is_lvalue_reference_v<_Tp&&>
- [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
- noexcept(noexcept(ranges::end(static_cast<const remove_reference_t<_Tp>&>(__t))))
- -> decltype(ranges::end(static_cast<const remove_reference_t<_Tp>&>(__t))) {
- return ranges::end(static_cast<const remove_reference_t<_Tp>&>(__t));
+ template <__member_data _Tp>
+ _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const noexcept(noexcept(__t.data())) {
+ return __t.data();
}
- template <class _Tp>
- requires is_rvalue_reference_v<_Tp&&>
- [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const noexcept(
- noexcept(ranges::end(static_cast<const _Tp&&>(__t)))) -> decltype(ranges::end(static_cast<const _Tp&&>(__t))) {
- return ranges::end(static_cast<const _Tp&&>(__t));
+ template <__ranges_begin_invocable _Tp>
+ _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
+ noexcept(noexcept(std::to_address(ranges::begin(__t)))) {
+ return std::to_address(ranges::begin(__t));
}
};
-} // namespace __cend
+} // namespace __data
inline namespace __cpo {
-inline constexpr auto cend = __cend::__fn{};
+inline constexpr auto data = __data::__fn{};
} // namespace __cpo
} // namespace ranges
diff --git a/libcxx/include/__ranges/as_const_view.h b/libcxx/include/__ranges/as_const_view.h
new file mode 100644
index 00000000000000..d2613ad939fd0d
--- /dev/null
+++ b/libcxx/include/__ranges/as_const_view.h
@@ -0,0 +1,205 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___RANGES_AS_CONST_VIEW_H
+#define _LIBCPP___RANGES_AS_CONST_VIEW_H
+
+#include <__concepts/constructible.h>
+#include <__iterator/concepts.h>
+#include <__ranges/all.h>
+#include <__ranges/concepts.h>
+#include <__ranges/const_access.h>
+#include <__ranges/empty_view.h>
+#include <__ranges/range_adaptor.h>
+#include <__ranges/ref_view.h>
+#include <__ranges/size.h>
+#include <__ranges/view_interface.h>
+#include <__type_traits/is_specialization.h>
+#include <__utility/auto_cast.h>
+#include <__utility/move.h>
+#include <__utility/pair.h>
+#include <cstddef>
+#include <span>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+# pragma GCC system_header
+#endif
+
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if _LIBCPP_STD_VER >= 23
+
+namespace ranges {
+template <input_range _View>
+ requires view<_View>
+class as_const_view : public view_interface<as_const_view<_View>> {
+ _LIBCPP_NO_UNIQUE_ADDRESS _View __base_ = _View();
+
+public:
+ _LIBCPP_HIDE_FROM_ABI as_const_view()
+ requires default_initializable<_View>
+ = default;
+ _LIBCPP_HIDE_FROM_ABI constexpr explicit as_const_view(_View __base) : __base_(std::move(__base)) {}
+
+ _LIBCPP_HIDE_FROM_ABI constexpr _View base() const&
+ requires copy_constructible<_View>
+ {
+ return __base_;
+ }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr _View base() && { return std::move(__base_); }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr auto begin()
+ requires(!__simple_view<_View>)
+ {
+ return ranges::cbegin(__base_);
+ }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr auto begin() const
+ requires range<const _View>
+ {
+ return ranges::cbegin(__base_);
+ }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr auto end()
+ requires(!__simple_view<_View>)
+ {
+ return ranges::cend(__base_);
+ }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr auto end() const
+ requires range<const _View>
+ {
+ return ranges::cend(__base_);
+ }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr auto size()
+ requires sized_range<_View>
+ {
+ return ranges::size(__base_);
+ }
+
+ _LIBCPP_HIDE_FROM_ABI constexpr auto size() const
+ requires sized_range<const _View>
+ {
+ return ranges::size(__base_);
+ }
+};
+
+template <class _Range>
+as_const_view(_Range&&) -> as_const_view<views::all_t<_Range>>;
+
+template <class _Tp>
+inline constexpr bool enable_borrowed_range<as_const_view<_Tp>> = enable_borrowed_range<_Tp>;
+
+namespace views {
+namespace __as_const {
+
+template <class _Tp>
+inline constexpr bool __is_span_v = false; // true if and only if _Tp is a specialization of span
+template <class _Tp, size_t _Extent>
+inline constexpr bool __is_span_v<span<_Tp, _Extent>> = true;
+
+template <class _UType>
+struct __xtype {
+ using type = void;
+};
+template <class _XType>
+struct __xtype<empty_view<_XType>> {
+ using type = _XType;
+};
+template <class _XType, size_t _Extent>
+struct __xtype<span<_XType, _Extent>> {
+ using type = _XType;
+ constexpr static size_t __extent = _Extent;
+};
+template <class _XType>
+struct __xtype<ref_view<_XType>> {
+ using type = _XType;
+};
+
+struct __fn : __range_adaptor_closure<__fn> {
+ // implementation strategy taken from Microsoft's STL
+ enum class __strategy {
+ __already_const,
+ __empty_view,
+ __span,
+ __ref_view,
+ __const_is_constant_range,
+ __otherwise,
+ __none,
+ };
+
+ template <class _Type>
+ static consteval pair<__strategy, bool> __choose_strategy() {
+ using _UType = std::remove_cvref_t<_Type>;
+ using _XType = __xtype<_UType>::type;
+
+ if constexpr (!requires { typename all_t<_Type>; }) {
+ return {__strategy::__none, false};
+ } else if constexpr (constant_range<all_t<_Type>>) {
+ return {__strategy::__already_const, noexcept(views::all(std::declval<_Type>()))};
+ } else if constexpr (__is_specialization_v<_UType, empty_view>) {
+ return {__strategy::__empty_view, true};
+ } else if constexpr (__is_span_v<_UType>) {
+ return {__strategy::__span, true};
+ } else if constexpr (__is_specialization_v<_UType, ref_view> && constant_range<const _XType>) {
+ return {__strategy::__ref_view, noexcept(ref_view(static_cast<const _XType&>(std::declval<_Type>().base())))};
+ } else if constexpr (is_lvalue_reference_v<_Type> && constant_range<const _UType> && !view<_UType>) {
+ return {__strategy::__const_is_constant_range,
+ noexcept(ref_view(static_cast<const _UType&>(std::declval<_Type>())))};
+ } else {
+ return {__strategy::__otherwise, noexcept(as_const_view(std::declval<_Type>()))};
+ }
+ }
+
+ template <class _Type>
+ requires(__choose_strategy<_Type>().first != __strategy::__none)
+ [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr static auto
+ operator()(_Type&& __range) noexcept(__choose_strategy<_Type>().second) {
+ using _UType = std::remove_cvref_t<_Type>;
+ using _XType = __xtype<_UType>::type;
+
+ constexpr auto __st = __choose_strategy<_Type>().first;
+
+ if constexpr (__st == __strategy::__already_const) {
+ return views::all(std::forward<_Type>(__range));
+ } else if constexpr (__st == __strategy::__empty_view) {
+ return auto(views::empty<const _XType>);
+ } else if constexpr (__st == __strategy::__span) {
+ return span<const _XType, __xtype<_UType>::__extent>(std::forward<_Type>(__range));
+ } else if constexpr (__st == __strategy::__ref_view) {
+ return ref_view(static_cast<const _XType&>(std::forward<_Type>(__range).base()));
+ } else if constexpr (__st == __strategy::__const_is_constant_range) {
+ return ref_view(static_cast<const _UType&>(std::forward<_Type>(__range)));
+ } else if constexpr (__st == __strategy::__otherwise) {
+ return as_const_view(std::forward<_Type>(__range));
+ }
+ }
+};
+
+} // namespace __as_const
+
+inline namespace __cpo {
+inline constexpr auto as_const = __as_const::__fn{};
+} // namespace __cpo
+} // namespace views
+
+} // namespace ranges
+
+#endif // _LIBCPP_STD_VER >= 23
+
+_LIBCPP_END_NAMESPACE_STD
+
+_LIBCPP_POP_MACROS
+
+#endif // _LIBCPP___RANGES_AS_CONST_VIEW_H
diff --git a/libcxx/include/__ranges/concepts.h b/libcxx/include/__ranges/concepts.h
index 674a3f359ff99c..22ff67a73bce1c 100644
--- a/libcxx/include/__ranges/concepts.h
+++ b/libcxx/include/__ranges/concepts.h
@@ -15,12 +15,12 @@
#include <__concepts/same_as.h>
#include <__config>
#include <__iterator/concepts.h>
+#include <__iterator/const_iterator.h>
#include <__iterator/incrementable_traits.h>
#include <__iterator/iter_move.h>
#include <__iterator/iterator_traits.h>
#include <__iterator/readable_traits.h>
#include <__ranges/access.h>
-#include <__ranges/data.h>
#include <__ranges/enable_borrowed_range.h>
#include <__ranges/enable_view.h>
#include <__ranges/size.h>
@@ -61,6 +61,8 @@ concept borrowed_range =
template <range _Rp>
using sentinel_t = decltype(ranges::end(std::declval<_Rp&>()));
+// `const_iterator_t` and `const_sentinel_t` defined in <__ranges/const_access.h>
+
template <range _Rp>
using range_difference_t = iter_difference_t<iterator_t<_Rp>>;
@@ -70,6 +72,11 @@ using range_value_t = iter_value_t<iterator_t<_Rp>>;
template <range _Rp>
using range_reference_t = iter_reference_t<iterator_t<_Rp>>;
+# if _LIBCPP_STD_VER >= 23
+template <range _Rp>
+using range_const_reference_t = iter_const_reference_t<iterator_t<_Rp>>;
+# endif
+
template <range _Rp>
using range_rvalue_reference_t = iter_rvalue_reference_t<iterator_t<_Rp>>;
@@ -133,6 +140,11 @@ concept viewable_range =
(is_lvalue_reference_v<_Tp> ||
(movable<remove_reference_t<_Tp>> && !__is_std_initializer_list<remove_cvref_t<_Tp>>))));
+# if _LIBCPP_STD_VER >= 23
+template <class _Tp>
+concept constant_range = input_range<_Tp> && __constant_iterator<iterator_t<_Tp>>;
+# endif // _LIBCPP_STD_VER >= 23
+
} // namespace ranges
#endif // _LIBCPP_STD_VER >= 20
diff --git a/libcxx/include/__ranges/const_access.h b/libcxx/include/__ranges/const_access.h
new file mode 100644
index 00000000000000..e7b95b26529538
--- /dev/null
+++ b/libcxx/include/__ranges/const_access.h
@@ -0,0 +1,266 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___RANGES_CONST_ACCESS_H
+#define _LIBCPP___RANGES_CONST_ACCESS_H
+
+#include <__iterator/const_iterator.h>
+#include <__ranges/access.h>
+#include <__ranges/concepts.h>
+#include <__ranges/enable_borrowed_range.h>
+#include <__ranges/rbegin.h>
+#include <__ranges/rend.h>
+#include <__type_traits/is_reference.h>
+#include <__type_traits/remove_cv.h>
+#include <__type_traits/remove_reference.h>
+#include <__utility/declval.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+# pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if _LIBCPP_STD_VER >= 20
+
+// [range.const]
+# if _LIBCPP_STD_VER >= 23
+namespace ranges {
+template <input_range _Rp>
+_LIBCPP_HIDE_FROM_ABI constexpr auto& __possibly_const_range(_Rp& __rng) noexcept {
+ if constexpr (constant_range<const _Rp> && !constant_range<_Rp>) {
+ return const_cast<const _Rp&>(__rng);
+ } else {
+ return __rng;
+ }
+}
+} // namespace ranges
+# endif // _LIBCPP_STD_VER >= 23
+
+// [range.access.cbegin]
+namespace ranges {
+
+template <class _Type>
+concept __const_accessible_range = (!is_rvalue_reference_v<_Type&&> || enable_borrowed_range<remove_cv_t<_Type>>);
+
+namespace __cbegin {
+struct __fn {
+# if _LIBCPP_STD_VER >= 23
+ template <class _Rng>
+ using _UType = decltype(ranges::begin(ranges::__possibly_const_range(std::declval<_Rng&>())));
+
+ template <__const_accessible_range _Rng>
+ [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr static auto
+ operator()(_Rng&& __rng) noexcept(noexcept(const_iterator<_UType<_Rng>>(
+ ranges::begin(ranges::__possibly_const_range(__rng))))) -> const_iterator<_UType<_Rng>> {
+ return const_iterator<_UType<_Rng>>(ranges::begin(ranges::__possibly_const_range(__rng)));
+ }
+# else // ^^^ _LIBCPP_STD_VER >= 23 / _LIBCPP_STD_VER < 23 vvv
+ template <class _Tp>
+ requires is_lvalue_reference_v<_Tp&&>
+ [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
+ noexcept(noexcept(ranges::begin(static_cast<const remove_reference_t<_Tp>&>(__t))))
+ -> decltype(ranges::begin(static_cast<const remove_reference_t<_Tp>&>(__t))) {
+ return ranges::begin(static_cast<const remove_reference_t<_Tp>&>(__t));
+ }
+
+ template <class _Tp>
+ requires is_rvalue_reference_v<_Tp&&>
+ [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
+ noexcept(noexcept(ranges::begin(static_cast<const _Tp&&>(__t))))
+ -> decltype(ranges::begin(static_cast<const _Tp&&>(__t))) {
+ return ranges::begin(static_cast<const _Tp&&>(__t));
+ }
+# endif // ^^^ _LIBCPP_STD_VER < 23
+};
+} // namespace __cbegin
+
+inline namespace __cpo {
+inline constexpr auto cbegin = __cbegin::__fn{};
+} // namespace __cpo
+} // namespace ranges
+
+# if _LIBCPP_STD_VER >= 23
+// [range.range]
+namespace ranges {
+template <class _Rp>
+using const_iterator_t = decltype(ranges::cbegin(std::declval<_Rp&>()));
+} // namespace ranges
+# endif // _LIBCPP_STD_VER >= 23
+
+// [range.access.cend]
+namespace ranges {
+namespace __cend {
+struct __fn {
+# if _LIBCPP_STD_VER >= 23
+ template <class _Rng>
+ using _UType = decltype(ranges::end(ranges::__possibly_const_range(std::declval<_Rng&>())));
+
+ template <__const_accessible_range _Rng>
+ [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr static auto
+ operator()(_Rng&& __rng) noexcept(noexcept(const_sentinel<_UType<_Rng>>(
+ ranges::end(ranges::__possibly_const_range(__rng))))) -> const_sentinel<_UType<_Rng>> {
+ return const_sentinel<_UType<_Rng>>(ranges::end(ranges::__possibly_const_range(__rng)));
+ }
+# else // ^^^ _LIBCPP_STD_VER >= 23 / _LIBCPP_STD_VER < 23 vvv
+ template <class _Tp>
+ requires is_lvalue_reference_v<_Tp&&>
+ [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
+ noexcept(noexcept(ranges::end(static_cast<const remove_reference_t<_Tp>&>(__t))))
+ -> decltype(ranges::end(static_cast<const remove_reference_t<_Tp>&>(__t))) {
+ return ranges::end(static_cast<const remove_reference_t<_Tp>&>(__t));
+ }
+
+ template <class _Tp>
+ requires is_rvalue_reference_v<_Tp&&>
+ [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const noexcept(
+ noexcept(ranges::end(static_cast<const _Tp&&>(__t)))) -> decltype(ranges::end(static_cast<const _Tp&&>(__t))) {
+ return ranges::end(static_cast<const _Tp&&>(__t));
+ }
+# endif
+};
+} // namespace __cend
+
+inline namespace __cpo {
+inline constexpr auto cend = __cend::__fn{};
+} // namespace __cpo
+} // namespace ranges
+
+# if _LIBCPP_STD_VER >= 23
+// [range.range]
+namespace ranges {
+template <class _Rp>
+using const_sentinel_t = decltype(ranges::cend(std::declval<_Rp&>()));
+} // namespace ranges
+# endif
+
+// [range.access.crbegin]
+namespace ranges {
+namespace __crbegin {
+struct __fn {
+# if _LIBCPP_STD_VER >= 23
+ template <class _Rng>
+ using _UType = decltype(ranges::rbegin(ranges::__possibly_const_range(std::declval<_Rng&>())));
+
+ template <__const_accessible_range _Rng>
+ [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr static auto
+ operator()(_Rng&& __rng) noexcept(noexcept(const_iterator<_UType<_Rng>>(
+ ranges::rbegin(ranges::__possibly_const_range(__rng))))) -> const_iterator<_UType<_Rng>> {
+ return const_iterator<_UType<_Rng>>(ranges::rbegin(ranges::__possibly_const_range(__rng)));
+ }
+# else // ^^^ _LIBCPP_STD_VER >= 23 / _LIBCPP_STD_VER < 23
+ template <class _Tp>
+ requires is_lvalue_reference_v<_Tp&&>
+ [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
+ noexcept(noexcept(ranges::rbegin(static_cast<const remove_reference_t<_Tp>&>(__t))))
+ -> decltype(ranges::rbegin(static_cast<const remove_reference_t<_Tp>&>(__t))) {
+ return ranges::rbegin(static_cast<const remove_reference_t<_Tp>&>(__t));
+ }
+
+ template <class _Tp>
+ requires is_rvalue_reference_v<_Tp&&>
+ [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
+ noexcept(noexcept(ranges::rbegin(static_cast<const _Tp&&>(__t))))
+ -> decltype(ranges::rbegin(static_cast<const _Tp&&>(__t))) {
+ return ranges::rbegin(static_cast<const _Tp&&>(__t));
+ }
+# endif // ^^^ _LIBCPP_STD_VER < 23
+};
+} // namespace __crbegin
+
+inline namespace __cpo {
+inline constexpr auto crbegin = __crbegin::__fn{};
+} // namespace __cpo
+} // namespace ranges
+
+// [range.access.crend]
+namespace ranges {
+namespace __crend {
+struct __fn {
+# if _LIBCPP_STD_VER >= 23
+ template <class _Rng>
+ using _UType = decltype(ranges::rend(ranges::__possibly_const_range(std::declval<_Rng&>())));
+
+ template <__const_accessible_range _Rng>
+ [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr static auto
+ operator()(_Rng&& __rng) noexcept(noexcept(const_sentinel<_UType<_Rng>>(
+ ranges::rend(ranges::__possibly_const_range(__rng))))) -> const_sentinel<_UType<_Rng>> {
+ return const_sentinel<_UType<_Rng>>(ranges::rend(ranges::__possibly_const_range(__rng)));
+ }
+# else // ^^^ _LIBCPP_STD_VER >= 23 / _LIBCPP_STD_VER < 23 vvv
+ template <class _Tp>
+ requires is_lvalue_reference_v<_Tp&&>
+ [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
+ noexcept(noexcept(ranges::rend(static_cast<const remove_reference_t<_Tp>&>(__t))))
+ -> decltype(ranges::rend(static_cast<const remove_reference_t<_Tp>&>(__t))) {
+ return ranges::rend(static_cast<const remove_reference_t<_Tp>&>(__t));
+ }
+
+ template <class _Tp>
+ requires is_rvalue_reference_v<_Tp&&>
+ [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const noexcept(
+ noexcept(ranges::rend(static_cast<const _Tp&&>(__t)))) -> decltype(ranges::rend(static_cast<const _Tp&&>(__t))) {
+ return ranges::rend(static_cast<const _Tp&&>(__t));
+ }
+# endif // ^^^ _LIBCPP_STD_VER < 23
+};
+} // namespace __crend
+
+inline namespace __cpo {
+inline constexpr auto crend = __crend::__fn{};
+} // namespace __cpo
+} // namespace ranges
+
+// [range.prim.cdata]
+
+namespace ranges {
+namespace __cdata {
+struct __fn {
+# if _LIBCPP_STD_VER >= 23
+ template <class _Tp>
+ _LIBCPP_HIDE_FROM_ABI constexpr static auto __as_const_pointer(const _Tp* __ptr) noexcept {
+ return __ptr;
+ }
+
+ template <__const_accessible_range _Rng>
+ [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr static auto
+ operator()(_Rng&& __rng) noexcept(noexcept(__as_const_pointer(ranges::data(ranges::__possibly_const_range(__rng)))))
+ -> decltype(__as_const_pointer(ranges::data(ranges::__possibly_const_range(__rng)))) {
+ return __as_const_pointer(ranges::data(ranges::__possibly_const_range(__rng)));
+ }
+
+# else // ^^^ _LIBCPP_STD_VER >= 23 / _LIBCPP_STD_VER < 23 vvv
+ template <class _Tp>
+ requires is_lvalue_reference_v<_Tp&&>
+ [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
+ noexcept(noexcept(ranges::data(static_cast<const remove_reference_t<_Tp>&>(__t))))
+ -> decltype(ranges::data(static_cast<const remove_reference_t<_Tp>&>(__t))) {
+ return ranges::data(static_cast<const remove_reference_t<_Tp>&>(__t));
+ }
+
+ template <class _Tp>
+ requires is_rvalue_reference_v<_Tp&&>
+ [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const noexcept(
+ noexcept(ranges::data(static_cast<const _Tp&&>(__t)))) -> decltype(ranges::data(static_cast<const _Tp&&>(__t))) {
+ return ranges::data(static_cast<const _Tp&&>(__t));
+ }
+# endif // ^^^ _LIBCPP_STD_VER < 23
+};
+} // namespace __cdata
+
+inline namespace __cpo {
+inline constexpr auto cdata = __cdata::__fn{};
+} // namespace __cpo
+} // namespace ranges
+
+#endif // _LIBCPP_STD_VER >= 20
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___RANGES_CONST_ACCESS_H
diff --git a/libcxx/include/__ranges/data.h b/libcxx/include/__ranges/data.h
deleted file mode 100644
index 50db3cffeeed8a..00000000000000
--- a/libcxx/include/__ranges/data.h
+++ /dev/null
@@ -1,102 +0,0 @@
-// -*- C++ -*-
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef _LIBCPP___RANGES_DATA_H
-#define _LIBCPP___RANGES_DATA_H
-
-#include <__concepts/class_or_enum.h>
-#include <__config>
-#include <__iterator/concepts.h>
-#include <__iterator/iterator_traits.h>
-#include <__memory/pointer_traits.h>
-#include <__ranges/access.h>
-#include <__type_traits/decay.h>
-#include <__type_traits/is_object.h>
-#include <__type_traits/is_pointer.h>
-#include <__type_traits/is_reference.h>
-#include <__type_traits/remove_pointer.h>
-#include <__type_traits/remove_reference.h>
-#include <__utility/auto_cast.h>
-
-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-# pragma GCC system_header
-#endif
-
-_LIBCPP_BEGIN_NAMESPACE_STD
-
-#if _LIBCPP_STD_VER >= 20
-
-// [range.prim.data]
-
-namespace ranges {
-namespace __data {
-template <class _Tp>
-concept __ptr_to_object = is_pointer_v<_Tp> && is_object_v<remove_pointer_t<_Tp>>;
-
-template <class _Tp>
-concept __member_data = __can_borrow<_Tp> && requires(_Tp&& __t) {
- { _LIBCPP_AUTO_CAST(__t.data()) } -> __ptr_to_object;
-};
-
-template <class _Tp>
-concept __ranges_begin_invocable = !__member_data<_Tp> && __can_borrow<_Tp> && requires(_Tp&& __t) {
- { ranges::begin(__t) } -> contiguous_iterator;
-};
-
-struct __fn {
- template <__member_data _Tp>
- _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const noexcept(noexcept(__t.data())) {
- return __t.data();
- }
-
- template <__ranges_begin_invocable _Tp>
- _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
- noexcept(noexcept(std::to_address(ranges::begin(__t)))) {
- return std::to_address(ranges::begin(__t));
- }
-};
-} // namespace __data
-
-inline namespace __cpo {
-inline constexpr auto data = __data::__fn{};
-} // namespace __cpo
-} // namespace ranges
-
-// [range.prim.cdata]
-
-namespace ranges {
-namespace __cdata {
-struct __fn {
- template <class _Tp>
- requires is_lvalue_reference_v<_Tp&&>
- [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
- noexcept(noexcept(ranges::data(static_cast<const remove_reference_t<_Tp>&>(__t))))
- -> decltype(ranges::data(static_cast<const remove_reference_t<_Tp>&>(__t))) {
- return ranges::data(static_cast<const remove_reference_t<_Tp>&>(__t));
- }
-
- template <class _Tp>
- requires is_rvalue_reference_v<_Tp&&>
- [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const noexcept(
- noexcept(ranges::data(static_cast<const _Tp&&>(__t)))) -> decltype(ranges::data(static_cast<const _Tp&&>(__t))) {
- return ranges::data(static_cast<const _Tp&&>(__t));
- }
-};
-} // namespace __cdata
-
-inline namespace __cpo {
-inline constexpr auto cdata = __cdata::__fn{};
-} // namespace __cpo
-} // namespace ranges
-
-#endif // _LIBCPP_STD_VER >= 20
-
-_LIBCPP_END_NAMESPACE_STD
-
-#endif // _LIBCPP___RANGES_DATA_H
diff --git a/libcxx/include/__ranges/owning_view.h b/libcxx/include/__ranges/owning_view.h
index 254bdb43291190..7e1b8318a2a4df 100644
--- a/libcxx/include/__ranges/owning_view.h
+++ b/libcxx/include/__ranges/owning_view.h
@@ -15,7 +15,6 @@
#include <__config>
#include <__ranges/access.h>
#include <__ranges/concepts.h>
-#include <__ranges/data.h>
#include <__ranges/empty.h>
#include <__ranges/enable_borrowed_range.h>
#include <__ranges/size.h>
diff --git a/libcxx/include/__ranges/rbegin.h b/libcxx/include/__ranges/rbegin.h
index 12e739e1a2b852..1e27ccc6648264 100644
--- a/libcxx/include/__ranges/rbegin.h
+++ b/libcxx/include/__ranges/rbegin.h
@@ -20,7 +20,6 @@
#include <__type_traits/decay.h>
#include <__type_traits/is_reference.h>
#include <__type_traits/remove_cvref.h>
-#include <__type_traits/remove_reference.h>
#include <__utility/auto_cast.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -85,34 +84,6 @@ inline constexpr auto rbegin = __rbegin::__fn{};
} // namespace __cpo
} // namespace ranges
-// [range.access.crbegin]
-
-namespace ranges {
-namespace __crbegin {
-struct __fn {
- template <class _Tp>
- requires is_lvalue_reference_v<_Tp&&>
- [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
- noexcept(noexcept(ranges::rbegin(static_cast<const remove_reference_t<_Tp>&>(__t))))
- -> decltype(ranges::rbegin(static_cast<const remove_reference_t<_Tp>&>(__t))) {
- return ranges::rbegin(static_cast<const remove_reference_t<_Tp>&>(__t));
- }
-
- template <class _Tp>
- requires is_rvalue_reference_v<_Tp&&>
- [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
- noexcept(noexcept(ranges::rbegin(static_cast<const _Tp&&>(__t))))
- -> decltype(ranges::rbegin(static_cast<const _Tp&&>(__t))) {
- return ranges::rbegin(static_cast<const _Tp&&>(__t));
- }
-};
-} // namespace __crbegin
-
-inline namespace __cpo {
-inline constexpr auto crbegin = __crbegin::__fn{};
-} // namespace __cpo
-} // namespace ranges
-
#endif // _LIBCPP_STD_VER >= 20
_LIBCPP_END_NAMESPACE_STD
diff --git a/libcxx/include/__ranges/ref_view.h b/libcxx/include/__ranges/ref_view.h
index 5329d778dd30db..db858b8e79490d 100644
--- a/libcxx/include/__ranges/ref_view.h
+++ b/libcxx/include/__ranges/ref_view.h
@@ -19,7 +19,6 @@
#include <__memory/addressof.h>
#include <__ranges/access.h>
#include <__ranges/concepts.h>
-#include <__ranges/data.h>
#include <__ranges/empty.h>
#include <__ranges/enable_borrowed_range.h>
#include <__ranges/size.h>
diff --git a/libcxx/include/__ranges/rend.h b/libcxx/include/__ranges/rend.h
index 02b4c5999a7ebb..f0194bf192ca24 100644
--- a/libcxx/include/__ranges/rend.h
+++ b/libcxx/include/__ranges/rend.h
@@ -21,7 +21,6 @@
#include <__type_traits/decay.h>
#include <__type_traits/is_reference.h>
#include <__type_traits/remove_cvref.h>
-#include <__type_traits/remove_reference.h>
#include <__utility/auto_cast.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -89,33 +88,6 @@ inline constexpr auto rend = __rend::__fn{};
} // namespace __cpo
} // namespace ranges
-// [range.access.crend]
-
-namespace ranges {
-namespace __crend {
-struct __fn {
- template <class _Tp>
- requires is_lvalue_reference_v<_Tp&&>
- [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const
- noexcept(noexcept(ranges::rend(static_cast<const remove_reference_t<_Tp>&>(__t))))
- -> decltype(ranges::rend(static_cast<const remove_reference_t<_Tp>&>(__t))) {
- return ranges::rend(static_cast<const remove_reference_t<_Tp>&>(__t));
- }
-
- template <class _Tp>
- requires is_rvalue_reference_v<_Tp&&>
- [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t) const noexcept(
- noexcept(ranges::rend(static_cast<const _Tp&&>(__t)))) -> decltype(ranges::rend(static_cast<const _Tp&&>(__t))) {
- return ranges::rend(static_cast<const _Tp&&>(__t));
- }
-};
-} // namespace __crend
-
-inline namespace __cpo {
-inline constexpr auto crend = __crend::__fn{};
-} // namespace __cpo
-} // namespace ranges
-
#endif // _LIBCPP_STD_VER >= 20
_LIBCPP_END_NAMESPACE_STD
diff --git a/libcxx/include/__ranges/view_interface.h b/libcxx/include/__ranges/view_interface.h
index 3bcfbaf3a2f9ed..f825941dcba4c4 100644
--- a/libcxx/include/__ranges/view_interface.h
+++ b/libcxx/include/__ranges/view_interface.h
@@ -20,6 +20,7 @@
#include <__memory/pointer_traits.h>
#include <__ranges/access.h>
#include <__ranges/concepts.h>
+#include <__ranges/const_access.h>
#include <__ranges/empty.h>
#include <__ranges/size.h>
#include <__type_traits/is_class.h>
@@ -72,6 +73,27 @@ class view_interface {
}
}
+ _LIBCPP_HIDE_FROM_ABI constexpr auto cbegin()
+ requires input_range<_Derived>
+ {
+ return ranges::cbegin(__derived());
+ }
+ _LIBCPP_HIDE_FROM_ABI constexpr auto cbegin() const
+ requires input_range<const _Derived>
+ {
+ return ranges::cbegin(__derived());
+ }
+ _LIBCPP_HIDE_FROM_ABI constexpr auto cend()
+ requires input_range<_Derived>
+ {
+ return ranges::cend(__derived());
+ }
+ _LIBCPP_HIDE_FROM_ABI constexpr auto cend() const
+ requires input_range<const _Derived>
+ {
+ return ranges::cend(__derived());
+ }
+
template <class _D2 = _Derived>
_LIBCPP_HIDE_FROM_ABI constexpr explicit operator bool()
requires requires(_D2& __t) { ranges::empty(__t); }
diff --git a/libcxx/include/iterator b/libcxx/include/iterator
index fca75f0a19ed1b..9a0c618f860cf8 100644
--- a/libcxx/include/iterator
+++ b/libcxx/include/iterator
@@ -383,6 +383,31 @@ insert_iterator<Container> inserter(Container& x, typename Container::iterator i
template <class Container>
constexpr insert_iterator<Container> inserter(Container& x, ranges::iterator_t<Container> i); // since C++20
+template<indirectly_readable I>
+using iter_const_reference_t = see below; // since C++23
+template<input_iterator I>
+using const_iterator = see below; // since C++23
+template<semiregular S>
+using const_sentinel = see below; // since C++23
+
+template<input_iterator Iterator>
+class basic_const_iterator; // since C++23
+
+template<class T, common_with<T> U>
+ requires input_iterator<common_type_t<T, U>>
+struct common_type<basic_const_iterator<T>, U>; // since C++23
+template<class T, common_with<T> U>
+ requires input_iterator<common_type_t<T, U>>
+struct common_type<U, basic_const_iterator<T>>; // since C++23
+template<class T, common_with<T> U>
+ requires input_iterator<common_type_t<T, U>>
+struct common_type<basic_const_iterator<T>, basic_const_iterator<U>>; // since C++23
+
+template<input_iterator I>
+constexpr const_iterator<I> make_const_iterator(I it); // since C++23
+template<semiregular S>
+constexpr const_sentinel<S> make_const_sentinel(S s); // since C++23
+
template <class Iterator>
class move_iterator {
public:
@@ -726,6 +751,10 @@ template <class E> constexpr const E* data(initializer_list<E> il) noexcept;
# include <__iterator/unreachable_sentinel.h>
#endif
+#if _LIBCPP_STD_VER >= 23
+# include <__iterator/const_iterator.h>
+#endif
+
#include <version>
// standard-mandated includes
diff --git a/libcxx/include/module.modulemap b/libcxx/include/module.modulemap
index f193b5d95f49f5..f4b472131bfc41 100644
--- a/libcxx/include/module.modulemap
+++ b/libcxx/include/module.modulemap
@@ -1408,6 +1408,7 @@ module std_private_iterator_concepts [system] {
export std_private_type_traits_is_reference
export std_private_type_traits_remove_cvref
}
+module std_private_iterator_const_iterator [system] { header "__iterator/const_iterator.h" }
module std_private_iterator_counted_iterator [system] { header "__iterator/counted_iterator.h" }
module std_private_iterator_cpp17_iterator_concepts [system] { header "__iterator/cpp17_iterator_concepts.h" }
module std_private_iterator_data [system] { header "__iterator/data.h" }
@@ -1690,9 +1691,11 @@ module std_private_ranges_all [system] {
export std_private_functional_perfect_forward
export std_private_ranges_owning_view
}
+module std_private_ranges_as_const_view [system] { header "__ranges/as_const_view.h" }
module std_private_ranges_as_rvalue_view [system] { header "__ranges/as_rvalue_view.h" }
module std_private_ranges_chunk_by_view [system] { header "__ranges/chunk_by_view.h" }
module std_private_ranges_common_view [system] { header "__ranges/common_view.h" }
+module std_private_ranges_const_access [system] { header "__ranges/const_access.h" }
module std_private_ranges_concepts [system] {
header "__ranges/concepts.h"
export std_private_iterator_concepts
@@ -1703,7 +1706,6 @@ module std_private_ranges_counted [system] {
export std_span
}
module std_private_ranges_dangling [system] { header "__ranges/dangling.h" }
-module std_private_ranges_data [system] { header "__ranges/data.h" }
module std_private_ranges_drop_view [system] { header "__ranges/drop_view.h" }
module std_private_ranges_drop_while_view [system] { header "__ranges/drop_while_view.h" }
module std_private_ranges_elements_view [system] { header "__ranges/elements_view.h" }
diff --git a/libcxx/include/ranges b/libcxx/include/ranges
index fa35874265de67..45698ea2fe32c7 100644
--- a/libcxx/include/ranges
+++ b/libcxx/include/ranges
@@ -39,6 +39,10 @@ namespace std::ranges {
using iterator_t = decltype(ranges::begin(declval<T&>()));
template<range R>
using sentinel_t = decltype(ranges::end(declval<R&>()));
+ template<range R>
+ using const_iterator_t = decltype(ranges::cbegin(declval<R&>())); // since C++23
+ template<range R>
+ using const_sentinel_t = decltype(ranges::cend(declval<R&>())); // since C++23
template<range R>
using range_difference_t = iter_difference_t<iterator_t<R>>;
template<sized_range R>
@@ -47,6 +51,8 @@ namespace std::ranges {
using range_value_t = iter_value_t<iterator_t<R>>;
template<range R>
using range_reference_t = iter_reference_t<iterator_t<R>>;
+ template<range R>
+ using range_const_reference_t = iter_const_reference_t<iterator_t<R>>; // since C++23
template<range R>
using range_rvalue_reference_t = iter_rvalue_reference_t<iterator_t<R>>;
template <range R>
@@ -93,6 +99,9 @@ namespace std::ranges {
template<class T>
concept viewable_range = see below;
+ template<class T>
+ concept constant_range = see below; // since C++23
+
// [range.adaptor.object], range adaptor objects
template<class D>
requires is_class_v<D> && same_as<D, remove_cv_t<D>>
@@ -387,9 +396,9 @@ namespace std {
# include <__ranges/all.h>
# include <__ranges/common_view.h>
# include <__ranges/concepts.h>
+# include <__ranges/const_access.h>
# include <__ranges/counted.h>
# include <__ranges/dangling.h>
-# include <__ranges/data.h>
# include <__ranges/drop_view.h>
# include <__ranges/drop_while_view.h>
# include <__ranges/elements_view.h>
@@ -421,6 +430,7 @@ namespace std {
#endif
#if _LIBCPP_STD_VER >= 23
+# include <__ranges/as_const_view.h>
# include <__ranges/as_rvalue_view.h>
# include <__ranges/chunk_by_view.h>
# include <__ranges/from_range.h>
diff --git a/libcxx/include/span b/libcxx/include/span
index da631cdc3f90e6..98a92822d630e4 100644
--- a/libcxx/include/span
+++ b/libcxx/include/span
@@ -65,7 +65,9 @@ public:
using reference = element_type&;
using const_reference = const element_type&;
using iterator = implementation-defined;
+ using const_iterator = std::const_iterator<iterator>; // since C++23
using reverse_iterator = std::reverse_iterator<iterator>;
+ using const_reverse_iterator = std::const_iterator<reverse_iterator>; // since C++23
static constexpr size_type extent = Extent;
// [span.cons], span constructors, copy, assignment, and destructor
@@ -115,8 +117,12 @@ public:
// [span.iterators], span iterator support
constexpr iterator begin() const noexcept;
constexpr iterator end() const noexcept;
+ constexpr const_iterator cbegin() const noexcept; // since C++23
+ constexpr const_iterator cend() const noexcept; // since C++23
constexpr reverse_iterator rbegin() const noexcept;
constexpr reverse_iterator rend() const noexcept;
+ constexpr const_reverse_iterator crbegin() const noexcept; // since C++23
+ constexpr const_reverse_iterator crend() const noexcept; // since C++23
private:
pointer data_; // exposition only
@@ -152,12 +158,13 @@ template<class R>
#include <__fwd/span.h>
#include <__iterator/bounded_iter.h>
#include <__iterator/concepts.h>
+#include <__iterator/const_iterator.h>
#include <__iterator/iterator_traits.h>
#include <__iterator/reverse_iterator.h>
#include <__iterator/wrap_iter.h>
#include <__memory/pointer_traits.h>
+#include <__ranges/access.h>
#include <__ranges/concepts.h>
-#include <__ranges/data.h>
#include <__ranges/enable_borrowed_range.h>
#include <__ranges/enable_view.h>
#include <__ranges/size.h>
@@ -167,6 +174,7 @@ template<class R>
#include <__type_traits/is_convertible.h>
#include <__type_traits/is_integral.h>
#include <__type_traits/is_same.h>
+#include <__type_traits/is_volatile.h>
#include <__type_traits/remove_const.h>
#include <__type_traits/remove_cv.h>
#include <__type_traits/remove_cvref.h>
@@ -242,6 +250,10 @@ public:
using iterator = __wrap_iter<pointer>;
# endif
using reverse_iterator = std::reverse_iterator<iterator>;
+# if _LIBCPP_STD_VER >= 23
+ using const_iterator = std::const_iterator<iterator>;
+ using const_reverse_iterator = std::const_iterator<reverse_iterator>;
+# endif // _LIBCPP_STD_VER >= 23
static constexpr size_type extent = _Extent;
@@ -390,8 +402,33 @@ public:
return iterator(data() + size());
# endif
}
+# if _LIBCPP_STD_VER >= 23
+ _LIBCPP_HIDE_FROM_ABI constexpr const_iterator cbegin() const noexcept
+ requires(!is_volatile_v<_Tp>)
+ {
+ return begin();
+ }
+ _LIBCPP_HIDE_FROM_ABI constexpr const_iterator cend() const noexcept
+ requires(!is_volatile_v<_Tp>)
+ {
+ return end();
+ }
+# endif // _LIBCPP_STD_VER >= 23
+
_LIBCPP_HIDE_FROM_ABI constexpr reverse_iterator rbegin() const noexcept { return reverse_iterator(end()); }
_LIBCPP_HIDE_FROM_ABI constexpr reverse_iterator rend() const noexcept { return reverse_iterator(begin()); }
+# if _LIBCPP_STD_VER >= 23
+ _LIBCPP_HIDE_FROM_ABI constexpr const_reverse_iterator crbegin() const noexcept
+ requires(!is_volatile_v<_Tp>)
+ {
+ return rbegin();
+ }
+ _LIBCPP_HIDE_FROM_ABI constexpr const_reverse_iterator crend() const noexcept
+ requires(!is_volatile_v<_Tp>)
+ {
+ return rend();
+ }
+# endif // _LIBCPP_STD_VER >= 23
_LIBCPP_HIDE_FROM_ABI span<const byte, _Extent * sizeof(element_type)> __as_bytes() const noexcept {
return span<const byte, _Extent * sizeof(element_type)>{reinterpret_cast<const byte*>(data()), size_bytes()};
@@ -423,6 +460,10 @@ public:
using iterator = __wrap_iter<pointer>;
# endif
using reverse_iterator = std::reverse_iterator<iterator>;
+# if _LIBCPP_STD_VER >= 23
+ using const_iterator = std::const_iterator<iterator>;
+ using const_reverse_iterator = std::const_iterator<reverse_iterator>;
+# endif
static constexpr size_type extent = dynamic_extent;
@@ -552,8 +593,33 @@ public:
return iterator(data() + size());
# endif
}
+# if _LIBCPP_STD_VER >= 23
+ _LIBCPP_HIDE_FROM_ABI constexpr const_iterator cbegin() const noexcept
+ requires(!is_volatile_v<_Tp>)
+ {
+ return begin();
+ }
+ _LIBCPP_HIDE_FROM_ABI constexpr const_iterator cend() const noexcept
+ requires(!is_volatile_v<_Tp>)
+ {
+ return end();
+ }
+# endif
+
_LIBCPP_HIDE_FROM_ABI constexpr reverse_iterator rbegin() const noexcept { return reverse_iterator(end()); }
_LIBCPP_HIDE_FROM_ABI constexpr reverse_iterator rend() const noexcept { return reverse_iterator(begin()); }
+# if _LIBCPP_STD_VER >= 23
+ _LIBCPP_HIDE_FROM_ABI constexpr const_reverse_iterator crbegin() const noexcept
+ requires(!is_volatile_v<_Tp>)
+ {
+ return rbegin();
+ }
+ _LIBCPP_HIDE_FROM_ABI constexpr const_reverse_iterator crend() const noexcept
+ requires(!is_volatile_v<_Tp>)
+ {
+ return rend();
+ }
+# endif
_LIBCPP_HIDE_FROM_ABI span<const byte, dynamic_extent> __as_bytes() const noexcept {
return {reinterpret_cast<const byte*>(data()), size_bytes()};
diff --git a/libcxx/include/string_view b/libcxx/include/string_view
index cf97e3a9be314d..63c319367c1394 100644
--- a/libcxx/include/string_view
+++ b/libcxx/include/string_view
@@ -219,8 +219,8 @@ namespace std {
#include <__iterator/reverse_iterator.h>
#include <__iterator/wrap_iter.h>
#include <__memory/pointer_traits.h>
+#include <__ranges/access.h>
#include <__ranges/concepts.h>
-#include <__ranges/data.h>
#include <__ranges/enable_borrowed_range.h>
#include <__ranges/enable_view.h>
#include <__ranges/size.h>
diff --git a/libcxx/include/version b/libcxx/include/version
index dc1d3fd268ce83..4a3ef43b6f57d4 100644
--- a/libcxx/include/version
+++ b/libcxx/include/version
@@ -185,7 +185,7 @@ __cpp_lib_quoted_string_io 201304L <iomanip>
__cpp_lib_ranges 202406L <algorithm> <functional> <iterator>
<memory> <ranges>
202110L // C++20
-__cpp_lib_ranges_as_const 202207L <ranges>
+__cpp_lib_ranges_as_const 202311L <ranges>
__cpp_lib_ranges_as_rvalue 202207L <ranges>
__cpp_lib_ranges_chunk 202202L <ranges>
__cpp_lib_ranges_chunk_by 202202L <ranges>
@@ -483,7 +483,7 @@ __cpp_lib_void_t 201411L <type_traits>
# define __cpp_lib_print 202207L
# undef __cpp_lib_ranges
# define __cpp_lib_ranges 202406L
-// # define __cpp_lib_ranges_as_const 202207L
+# define __cpp_lib_ranges_as_const 202311L
# define __cpp_lib_ranges_as_rvalue 202207L
// # define __cpp_lib_ranges_chunk 202202L
# define __cpp_lib_ranges_chunk_by 202202L
diff --git a/libcxx/modules/std/iterator.inc b/libcxx/modules/std/iterator.inc
index 10c63d74e6e05e..5278ceaf2785b6 100644
--- a/libcxx/modules/std/iterator.inc
+++ b/libcxx/modules/std/iterator.inc
@@ -182,18 +182,21 @@ export namespace std {
using std::insert_iterator;
using std::inserter;
+#if _LIBCPP_STD_VER >= 23
// [const.iterators], constant iterators and sentinels
// [const.iterators.alias], alias templates
- // using std::const_iterator;
- // using std::const_sentinel;
- // using std::iter_const_reference_t;
+ using std::const_iterator;
+ using std::const_sentinel;
+ using std::iter_const_reference_t;
// [const.iterators.iterator], class template basic_const_iterator
- // using std::basic_const_iterator;
+ using std::basic_const_iterator;
- // using std::common_type;
+ using std::common_type;
- // using std::make_const_iterator;
+ using std::make_const_iterator;
+ using std::make_const_sentinel;
+#endif
// [move.iterators], move iterators and sentinels
using std::move_iterator;
diff --git a/libcxx/modules/std/ranges.inc b/libcxx/modules/std/ranges.inc
index f71efe948ede10..e111d818a3ae00 100644
--- a/libcxx/modules/std/ranges.inc
+++ b/libcxx/modules/std/ranges.inc
@@ -34,10 +34,14 @@ export namespace std {
using std::ranges::borrowed_range;
- // using std::ranges::const_iterator_t;
- // using std::ranges::const_sentinel_t;
+#if _LIBCPP_STD_VER >= 23
+ using std::ranges::const_iterator_t;
+ using std::ranges::const_sentinel_t;
+#endif
using std::ranges::iterator_t;
- // using std::ranges::range_const_reference_t;
+#if _LIBCPP_STD_VER >= 23
+ using std::ranges::range_const_reference_t;
+#endif
using std::ranges::range_common_reference_t;
using std::ranges::range_difference_t;
using std::ranges::range_reference_t;
@@ -58,7 +62,9 @@ export namespace std {
// [range.refinements], other range refinements
using std::ranges::bidirectional_range;
using std::ranges::common_range;
- // using std::ranges::constant_range;
+#if _LIBCPP_STD_VER >= 23
+ using std::ranges::constant_range;
+#endif
using std::ranges::contiguous_range;
using std::ranges::forward_range;
using std::ranges::input_range;
diff --git a/libcxx/test/std/containers/views/views.span/range_concept_conformance.compile.pass.cpp b/libcxx/test/std/containers/views/views.span/range_concept_conformance.compile.pass.cpp
index fe28aeea3802b5..414d009ab93a06 100644
--- a/libcxx/test/std/containers/views/views.span/range_concept_conformance.compile.pass.cpp
+++ b/libcxx/test/std/containers/views/views.span/range_concept_conformance.compile.pass.cpp
@@ -15,6 +15,8 @@
#include <concepts>
#include <ranges>
+#include "test_macros.h"
+
using range = std::span<int>;
@@ -35,3 +37,8 @@ static_assert(!std::ranges::view<range const> && !std::ranges::enable_view<range
static_assert(std::ranges::sized_range<range const>);
static_assert(std::ranges::borrowed_range<range const>);
static_assert(std::ranges::viewable_range<range const>);
+
+#if TEST_STD_VER >= 23
+static_assert(std::same_as<std::ranges::const_iterator_t<range>, range::const_iterator>);
+static_assert(std::same_as<std::ranges::const_iterator_t<range const>, range::const_iterator>);
+#endif
diff --git a/libcxx/test/std/containers/views/views.span/span.iterators/begin.pass.cpp b/libcxx/test/std/containers/views/views.span/span.iterators/begin.pass.cpp
index f6b24017ffc1f9..70dda6e5c2a5e0 100644
--- a/libcxx/test/std/containers/views/views.span/span.iterators/begin.pass.cpp
+++ b/libcxx/test/std/containers/views/views.span/span.iterators/begin.pass.cpp
@@ -10,7 +10,7 @@
// <span>
// constexpr iterator begin() const noexcept;
-// constexpr const_iterator cbegin() const noexcept;
+// constexpr const_iterator cbegin() const noexcept; // since C++23
#include <span>
#include <cassert>
@@ -18,90 +18,68 @@
#include "test_macros.h"
-template <class Span>
-constexpr bool testConstexprSpan(Span s)
-{
- bool ret = true;
- typename Span::iterator b = s.begin();
-
- if (s.empty())
- {
- ret = ret && (b == s.end());
- }
- else
- {
- ret = ret && ( *b == s[0]);
- ret = ret && (&*b == &s[0]);
- }
- return ret;
+template <class Span, class Iter>
+constexpr bool testSpanImpl(Span s, Iter first) {
+ bool ret = true;
+ if (s.empty()) {
+ ret = ret && (first == s.end());
+ } else {
+ ret = ret && (*first == s[0]);
+ ret = ret && (&*first == &s[0]);
+ }
+ return ret;
}
+template <class EType, size_t Extent, class... Args>
+constexpr bool testSpan(Args&&... args) {
+ auto s1 = std::span<EType>(std::forward<Args>(args)...);
+ bool ret = true;
-template <class Span>
-void testRuntimeSpan(Span s)
-{
- typename Span::iterator b = s.begin();
-
- if (s.empty())
- {
- assert(b == s.end());
- }
- else
- {
- assert( *b == s[0]);
- assert(&*b == &s[0]);
- }
+ ret = ret && testSpanImpl(s1, s1.begin());
+#if TEST_STD_VER >= 23
+ ret = ret && testSpanImpl(s1, s1.cbegin());
+#endif
+
+ auto s2 = std::span<EType, Extent>(std::forward<Args>(args)...);
+ ret = ret && testSpanImpl(s2, s2.begin());
+#if TEST_STD_VER >= 23
+ ret = ret && testSpanImpl(s2, s2.cbegin());
+#endif
+
+ return ret;
}
-struct A{};
-bool operator==(A, A) {return true;}
-
-constexpr int iArr1[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
- int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
-
-
-int main(int, char**)
-{
- static_assert(testConstexprSpan(std::span<int>()), "");
- static_assert(testConstexprSpan(std::span<long>()), "");
- static_assert(testConstexprSpan(std::span<double>()), "");
- static_assert(testConstexprSpan(std::span<A>()), "");
- static_assert(testConstexprSpan(std::span<std::string>()), "");
-
- static_assert(testConstexprSpan(std::span<int, 0>()), "");
- static_assert(testConstexprSpan(std::span<long, 0>()), "");
- static_assert(testConstexprSpan(std::span<double, 0>()), "");
- static_assert(testConstexprSpan(std::span<A, 0>()), "");
- static_assert(testConstexprSpan(std::span<std::string, 0>()), "");
-
- static_assert(testConstexprSpan(std::span<const int>(iArr1, 1)), "");
- static_assert(testConstexprSpan(std::span<const int>(iArr1, 2)), "");
- static_assert(testConstexprSpan(std::span<const int>(iArr1, 3)), "");
- static_assert(testConstexprSpan(std::span<const int>(iArr1, 4)), "");
- static_assert(testConstexprSpan(std::span<const int>(iArr1, 5)), "");
-
-
- testRuntimeSpan(std::span<int> ());
- testRuntimeSpan(std::span<long> ());
- testRuntimeSpan(std::span<double> ());
- testRuntimeSpan(std::span<A> ());
- testRuntimeSpan(std::span<std::string>());
-
- testRuntimeSpan(std::span<int, 0> ());
- testRuntimeSpan(std::span<long, 0> ());
- testRuntimeSpan(std::span<double, 0> ());
- testRuntimeSpan(std::span<A, 0> ());
- testRuntimeSpan(std::span<std::string, 0>());
-
- testRuntimeSpan(std::span<int>(iArr2, 1));
- testRuntimeSpan(std::span<int>(iArr2, 2));
- testRuntimeSpan(std::span<int>(iArr2, 3));
- testRuntimeSpan(std::span<int>(iArr2, 4));
- testRuntimeSpan(std::span<int>(iArr2, 5));
-
- std::string s;
- testRuntimeSpan(std::span<std::string>(&s, (std::size_t) 0));
- testRuntimeSpan(std::span<std::string>(&s, 1));
+struct A {};
+bool operator==(A, A) { return true; }
+
+constexpr int iArr1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
+
+int main(int, char**) {
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<int, 0>());
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<long, 0>());
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<double, 0>());
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<A, 0>());
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<std::string, 0>());
+
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const int, 1>(iArr1, 1));
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const int, 2>(iArr1, 2));
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const int, 3>(iArr1, 3));
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const int, 4>(iArr1, 4));
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const int, 5>(iArr1, 5));
+
+ testSpan<int, 1>(iArr2, 1);
+ testSpan<int, 2>(iArr2, 2);
+ testSpan<int, 3>(iArr2, 3);
+ testSpan<int, 4>(iArr2, 4);
+ testSpan<int, 5>(iArr2, 5);
+
+ std::string s1;
+ constexpr static std::string s2;
+ testSpan<std::string, 0>(&s1, static_cast<size_t>(0));
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const std::string, 0>(&s2, static_cast<size_t>(0)));
+ testSpan<std::string, 1>(&s1, 1);
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const std::string, 1>(&s2, 1));
return 0;
}
diff --git a/libcxx/test/std/containers/views/views.span/span.iterators/end.pass.cpp b/libcxx/test/std/containers/views/views.span/span.iterators/end.pass.cpp
index d6aaf74d1058c3..5fc3cead94d6b2 100644
--- a/libcxx/test/std/containers/views/views.span/span.iterators/end.pass.cpp
+++ b/libcxx/test/std/containers/views/views.span/span.iterators/end.pass.cpp
@@ -10,7 +10,7 @@
// <span>
// constexpr iterator end() const noexcept;
-// constexpr const_iterator cend() const noexcept;
+// constexpr const_iterator cend() const noexcept; // since C++23
#include <span>
#include <cassert>
@@ -18,94 +18,69 @@
#include "test_macros.h"
-template <class Span>
-constexpr bool testConstexprSpan(Span s)
-{
- bool ret = true;
- typename Span::iterator e = s.end();
- if (s.empty())
- {
- ret = ret && (e == s.begin());
- }
- else
- {
- typename Span::const_pointer last = &*(s.begin() + s.size() - 1);
- ret = ret && (e != s.begin());
- ret = ret && (&*( e-1) == last);
- }
-
- ret = ret && (static_cast<std::size_t>(e - s.begin()) == s.size());
- return ret;
+template <class Span, class Iter>
+constexpr bool testSpanImpl(Span s, Iter last) {
+ bool ret = true;
+ if (s.empty()) {
+ ret = ret && (last == s.begin());
+ } else {
+ ret = ret && (last != s.begin());
+ ret = ret && (&*(last - 1) == s.data() + s.size() - 1);
+ }
+ ret = ret && (static_cast<size_t>(last - s.begin()) == s.size());
+ return ret;
}
-template <class Span>
-void testRuntimeSpan(Span s)
-{
- typename Span::iterator e = s.end();
- if (s.empty())
- {
- assert(e == s.begin());
- }
- else
- {
- typename Span::const_pointer last = &*(s.begin() + s.size() - 1);
- assert(e != s.begin());
- assert(&*( e-1) == last);
- }
-
- assert(static_cast<std::size_t>(e - s.begin()) == s.size());
-}
-
-
-struct A{};
-bool operator==(A, A) {return true;}
-
-constexpr int iArr1[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
- int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
-
+template <class EType, size_t Extent, class... Args>
+constexpr bool testSpan(Args&&... args) {
+ auto s1 = std::span<EType>(std::forward<Args>(args)...);
+ bool ret = true;
-int main(int, char**)
-{
- static_assert(testConstexprSpan(std::span<int>()), "");
- static_assert(testConstexprSpan(std::span<long>()), "");
- static_assert(testConstexprSpan(std::span<double>()), "");
- static_assert(testConstexprSpan(std::span<A>()), "");
- static_assert(testConstexprSpan(std::span<std::string>()), "");
+ ret = ret && testSpanImpl(s1, s1.end());
+#if TEST_STD_VER >= 23
+ ret = ret && testSpanImpl(s1, s1.cend());
+#endif
- static_assert(testConstexprSpan(std::span<int, 0>()), "");
- static_assert(testConstexprSpan(std::span<long, 0>()), "");
- static_assert(testConstexprSpan(std::span<double, 0>()), "");
- static_assert(testConstexprSpan(std::span<A, 0>()), "");
- static_assert(testConstexprSpan(std::span<std::string, 0>()), "");
+ auto s2 = std::span<EType, Extent>(std::forward<Args>(args)...);
+ ret = ret && testSpanImpl(s2, s2.end());
+#if TEST_STD_VER >= 23
+ ret = ret && testSpanImpl(s2, s2.cend());
+#endif
- static_assert(testConstexprSpan(std::span<const int>(iArr1, 1)), "");
- static_assert(testConstexprSpan(std::span<const int>(iArr1, 2)), "");
- static_assert(testConstexprSpan(std::span<const int>(iArr1, 3)), "");
- static_assert(testConstexprSpan(std::span<const int>(iArr1, 4)), "");
- static_assert(testConstexprSpan(std::span<const int>(iArr1, 5)), "");
-
-
- testRuntimeSpan(std::span<int> ());
- testRuntimeSpan(std::span<long> ());
- testRuntimeSpan(std::span<double> ());
- testRuntimeSpan(std::span<A> ());
- testRuntimeSpan(std::span<std::string>());
-
- testRuntimeSpan(std::span<int, 0> ());
- testRuntimeSpan(std::span<long, 0> ());
- testRuntimeSpan(std::span<double, 0> ());
- testRuntimeSpan(std::span<A, 0> ());
- testRuntimeSpan(std::span<std::string, 0>());
-
- testRuntimeSpan(std::span<int>(iArr2, 1));
- testRuntimeSpan(std::span<int>(iArr2, 2));
- testRuntimeSpan(std::span<int>(iArr2, 3));
- testRuntimeSpan(std::span<int>(iArr2, 4));
- testRuntimeSpan(std::span<int>(iArr2, 5));
+ return ret;
+}
- std::string s;
- testRuntimeSpan(std::span<std::string>(&s, (std::size_t) 0));
- testRuntimeSpan(std::span<std::string>(&s, 1));
+struct A {};
+bool operator==(A, A) { return true; }
+
+constexpr int iArr1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
+
+int main(int, char**) {
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<int, 0>());
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<long, 0>());
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<double, 0>());
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<A, 0>());
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<std::string, 0>());
+
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const int, 1>(iArr1, 1));
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const int, 2>(iArr1, 2));
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const int, 3>(iArr1, 3));
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const int, 4>(iArr1, 4));
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const int, 5>(iArr1, 5));
+
+ testSpan<int, 1>(iArr2, 1);
+ testSpan<int, 2>(iArr2, 2);
+ testSpan<int, 3>(iArr2, 3);
+ testSpan<int, 4>(iArr2, 4);
+ testSpan<int, 5>(iArr2, 5);
+
+ std::string s1;
+ constexpr static std::string s2;
+ testSpan<std::string, 0>(&s1, static_cast<size_t>(0));
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const std::string, 0>(&s2, static_cast<size_t>(0)));
+ testSpan<std::string, 1>(&s1, 1);
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const std::string, 1>(&s2, 1));
return 0;
}
diff --git a/libcxx/test/std/containers/views/views.span/span.iterators/iterator.pass.cpp b/libcxx/test/std/containers/views/views.span/span.iterators/iterator.pass.cpp
index 13a7628e6043d9..7379ce61436d84 100644
--- a/libcxx/test/std/containers/views/views.span/span.iterators/iterator.pass.cpp
+++ b/libcxx/test/std/containers/views/views.span/span.iterators/iterator.pass.cpp
@@ -26,20 +26,17 @@ constexpr void test_type() {
using C = std::span<T>;
typename C::iterator ii1{}, ii2{};
typename C::iterator ii4 = ii1;
- // TODO Test against C++23 after implementing
- // P2278R4 cbegin should always return a constant iterator
- // The means adjusting the #ifdef to guard against C++23.
-#ifdef __cpp_lib_ranges_as_const
+#if TEST_STD_VER >= 23
typename C::const_iterator cii{};
#endif
assert(ii1 == ii2);
assert(ii1 == ii4);
-#ifdef __cpp_lib_ranges_as_const
+#if TEST_STD_VER >= 23
assert(ii1 == cii);
#endif
assert(!(ii1 != ii2));
-#ifdef __cpp_lib_ranges_as_const
+#if TEST_STD_VER >= 23
assert(!(ii1 != cii));
#endif
@@ -47,21 +44,21 @@ constexpr void test_type() {
C c{&v, 1};
assert(c.begin() == std::begin(c));
assert(c.rbegin() == std::rbegin(c));
-#ifdef __cpp_lib_ranges_as_const
+#if TEST_STD_VER >= 23
assert(c.cbegin() == std::cbegin(c));
assert(c.crbegin() == std::crbegin(c));
#endif
assert(c.end() == std::end(c));
assert(c.rend() == std::rend(c));
-#ifdef __cpp_lib_ranges_as_const
+#if TEST_STD_VER >= 23
assert(c.cend() == std::cend(c));
assert(c.crend() == std::crend(c));
#endif
assert(std::begin(c) != std::end(c));
assert(std::rbegin(c) != std::rend(c));
-#ifdef __cpp_lib_ranges_as_const
+#if TEST_STD_VER >= 23
assert(std::cbegin(c) != std::cend(c));
assert(std::crbegin(c) != std::crend(c));
#endif
@@ -70,7 +67,7 @@ constexpr void test_type() {
std::same_as<std::strong_ordering> decltype(auto) r1 = ii1 <=> ii2;
assert(r1 == std::strong_ordering::equal);
-#ifdef __cpp_lib_ranges_as_const
+#if TEST_STD_VER >= 23
std::same_as<std::strong_ordering> decltype(auto) r2 = cii <=> ii2;
assert(r2 == std::strong_ordering::equal);
#endif
diff --git a/libcxx/test/std/containers/views/views.span/span.iterators/iterator_concept_conformance.compile.pass.cpp b/libcxx/test/std/containers/views/views.span/span.iterators/iterator_concept_conformance.compile.pass.cpp
index 1d9ea600bd2a06..3eedb24bee7b28 100644
--- a/libcxx/test/std/containers/views/views.span/span.iterators/iterator_concept_conformance.compile.pass.cpp
+++ b/libcxx/test/std/containers/views/views.span/span.iterators/iterator_concept_conformance.compile.pass.cpp
@@ -19,6 +19,11 @@ using iterator = std::span<int>::iterator;
using reverse_iterator = std::span<int>::reverse_iterator;
using value_type = int;
+#if TEST_STD_VER >= 23
+using const_iterator = std::span<int>::const_iterator;
+using const_reverse_iterator = std::span<int>::const_reverse_iterator;
+#endif
+
static_assert(std::contiguous_iterator<iterator>);
LIBCPP_STATIC_ASSERT(std::__has_random_access_iterator_category<iterator>::value);
static_assert(std::indirectly_writable<iterator, value_type>);
@@ -31,3 +36,18 @@ static_assert(std::indirectly_movable_storable<iterator, int*>);
static_assert(std::indirectly_copyable<iterator, int*>);
static_assert(std::indirectly_copyable_storable<iterator, int*>);
static_assert(std::indirectly_swappable<iterator, iterator>);
+
+#if TEST_STD_VER >= 23
+static_assert(std::contiguous_iterator<const_iterator>);
+LIBCPP_STATIC_ASSERT(std::__has_random_access_iterator_category<const_iterator>::value);
+static_assert(std::sentinel_for<const_iterator, const_iterator>);
+static_assert(std::sentinel_for<const_iterator, iterator>);
+static_assert(std::sentinel_for<iterator, const_iterator>);
+static_assert(!std::sentinel_for<const_iterator, const_reverse_iterator>);
+static_assert(!std::sentinel_for<const_iterator, reverse_iterator>);
+static_assert(std::sized_sentinel_for<const_iterator, const_iterator>);
+static_assert(std::sized_sentinel_for<iterator, const_iterator>);
+static_assert(std::sized_sentinel_for<const_iterator, iterator>);
+static_assert(!std::sized_sentinel_for<const_iterator, const_reverse_iterator>);
+static_assert(!std::sized_sentinel_for<const_iterator, reverse_iterator>);
+#endif
diff --git a/libcxx/test/std/containers/views/views.span/span.iterators/rbegin.pass.cpp b/libcxx/test/std/containers/views/views.span/span.iterators/rbegin.pass.cpp
index 26e4389840857f..5dca0e89565470 100644
--- a/libcxx/test/std/containers/views/views.span/span.iterators/rbegin.pass.cpp
+++ b/libcxx/test/std/containers/views/views.span/span.iterators/rbegin.pass.cpp
@@ -9,8 +9,8 @@
// <span>
-// constexpr reverse_iterator rbegin() const noexcept;
-// constexpr const_reverse_iterator crbegin() const noexcept;
+// constexpr neverse_iterator rbegin() const noexcept;
+// constexpr const_reverse_iterator crbegin() const noexcept; // since C++23
#include <span>
#include <cassert>
@@ -18,91 +18,70 @@
#include "test_macros.h"
-template <class Span>
-constexpr bool testConstexprSpan(Span s)
-{
- bool ret = true;
- typename Span::reverse_iterator b = s.rbegin();
- if (s.empty())
- {
- ret = ret && ( b == s.rend());
- }
- else
- {
- const typename Span::size_type last = s.size() - 1;
- ret = ret && ( *b == s[last]);
- ret = ret && (&*b == &s[last]);
- }
- return ret;
+template <class Span, class Iter>
+constexpr bool testSpanImpl(Span s, Iter rfirst) {
+ bool ret = true;
+ if (s.empty()) {
+ ret = ret && (rfirst == s.rend());
+ } else {
+ const typename Span::size_type last = s.size() - 1;
+
+ ret = ret && (*rfirst == s[last]);
+ ret = ret && (&*rfirst == &s[last]);
+ }
+ return ret;
}
+template <class EType, size_t Extent, class... Args>
+constexpr bool testSpan(Args&&... args) {
+ auto s1 = std::span<EType>(std::forward<Args>(args)...);
+ bool ret = true;
-template <class Span>
-void testRuntimeSpan(Span s)
-{
- typename Span::reverse_iterator b = s.rbegin();
- if (s.empty())
- {
- assert(b == s.rend());
- }
- else
- {
- const typename Span::size_type last = s.size() - 1;
- assert( *b == s[last]);
- assert(&*b == &s[last]);
- }
-}
-
-
-struct A{};
-bool operator==(A, A) {return true;}
-
-constexpr int iArr1[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
- int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
-
-
-int main(int, char**)
-{
- static_assert(testConstexprSpan(std::span<int>()), "");
- static_assert(testConstexprSpan(std::span<long>()), "");
- static_assert(testConstexprSpan(std::span<double>()), "");
- static_assert(testConstexprSpan(std::span<A>()), "");
- static_assert(testConstexprSpan(std::span<std::string>()), "");
+ ret = ret && testSpanImpl(s1, s1.rbegin());
+#if TEST_STD_VER >= 23
+ ret = ret && testSpanImpl(s1, s1.crbegin());
+#endif
- static_assert(testConstexprSpan(std::span<int, 0>()), "");
- static_assert(testConstexprSpan(std::span<long, 0>()), "");
- static_assert(testConstexprSpan(std::span<double, 0>()), "");
- static_assert(testConstexprSpan(std::span<A, 0>()), "");
- static_assert(testConstexprSpan(std::span<std::string, 0>()), "");
+ auto s2 = std::span<EType, Extent>(std::forward<Args>(args)...);
+ ret = ret && testSpanImpl(s2, s2.rbegin());
+#if TEST_STD_VER >= 23
+ ret = ret && testSpanImpl(s2, s2.crbegin());
+#endif
- static_assert(testConstexprSpan(std::span<const int>(iArr1, 1)), "");
- static_assert(testConstexprSpan(std::span<const int>(iArr1, 2)), "");
- static_assert(testConstexprSpan(std::span<const int>(iArr1, 3)), "");
- static_assert(testConstexprSpan(std::span<const int>(iArr1, 4)), "");
- static_assert(testConstexprSpan(std::span<const int>(iArr1, 5)), "");
-
-
- testRuntimeSpan(std::span<int> ());
- testRuntimeSpan(std::span<long> ());
- testRuntimeSpan(std::span<double> ());
- testRuntimeSpan(std::span<A> ());
- testRuntimeSpan(std::span<std::string>());
-
- testRuntimeSpan(std::span<int, 0> ());
- testRuntimeSpan(std::span<long, 0> ());
- testRuntimeSpan(std::span<double, 0> ());
- testRuntimeSpan(std::span<A, 0> ());
- testRuntimeSpan(std::span<std::string, 0>());
-
- testRuntimeSpan(std::span<int>(iArr2, 1));
- testRuntimeSpan(std::span<int>(iArr2, 2));
- testRuntimeSpan(std::span<int>(iArr2, 3));
- testRuntimeSpan(std::span<int>(iArr2, 4));
- testRuntimeSpan(std::span<int>(iArr2, 5));
+ return ret;
+}
- std::string s;
- testRuntimeSpan(std::span<std::string>(&s, static_cast<std::size_t>(0)));
- testRuntimeSpan(std::span<std::string>(&s, 1));
+struct A {};
+bool operator==(A, A) { return true; }
+
+constexpr int iArr1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
+
+int main(int, char**) {
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<int, 0>());
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<long, 0>());
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<double, 0>());
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<A, 0>());
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<std::string, 0>());
+
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const int, 1>(iArr1, 1));
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const int, 2>(iArr1, 2));
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const int, 3>(iArr1, 3));
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const int, 4>(iArr1, 4));
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const int, 5>(iArr1, 5));
+
+ testSpan<int, 1>(iArr2, 1);
+ testSpan<int, 2>(iArr2, 2);
+ testSpan<int, 3>(iArr2, 3);
+ testSpan<int, 4>(iArr2, 4);
+ testSpan<int, 5>(iArr2, 5);
+
+ std::string s1;
+ constexpr static std::string s2;
+ testSpan<std::string, 0>(&s1, static_cast<size_t>(0));
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const std::string, 0>(&s2, static_cast<size_t>(0)));
+ testSpan<std::string, 1>(&s1, 1);
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const std::string, 1>(&s2, 1));
return 0;
}
diff --git a/libcxx/test/std/containers/views/views.span/span.iterators/rend.pass.cpp b/libcxx/test/std/containers/views/views.span/span.iterators/rend.pass.cpp
index ffec15c6b2492c..85e43c0a0bb424 100644
--- a/libcxx/test/std/containers/views/views.span/span.iterators/rend.pass.cpp
+++ b/libcxx/test/std/containers/views/views.span/span.iterators/rend.pass.cpp
@@ -10,7 +10,7 @@
// <span>
// constexpr reverse_iterator rend() const noexcept;
-// constexpr const_reverse_iterator crend() const noexcept;
+// constexpr const_reverse_iterator crend() const noexcept; // since C++23
#include <span>
#include <cassert>
@@ -18,90 +18,71 @@
#include "test_macros.h"
-template <class Span>
-constexpr bool testConstexprSpan(Span s)
-{
- bool ret = true;
- typename Span::reverse_iterator e = s.rend();
- if (s.empty())
- {
- ret = ret && (e == s.rbegin());
- }
- else
- {
- ret = ret && (e != s.rbegin());
- }
-
- ret = ret && (static_cast<std::size_t>(e - s.rbegin()) == s.size());
- return ret;
-}
-
-template <class Span>
-void testRuntimeSpan(Span s)
-{
- typename Span::reverse_iterator e = s.rend();
- if (s.empty())
- {
- assert(e == s.rbegin());
- }
- else
- {
- assert(e != s.rbegin());
- }
-
- assert(static_cast<std::size_t>(e - s.rbegin()) == s.size());
-}
-
-
-struct A{};
-bool operator==(A, A) {return true;}
+template <class Span, class Iter>
+constexpr bool testSpanImpl(Span s, Iter rlast) {
+ bool ret = true;
+ if (s.empty()) {
+ ret = ret && (rlast == s.rbegin());
+ } else {
+ ret = ret && (rlast != s.rbegin());
+ ret = ret && (rlast == std::make_reverse_iterator(s.begin()));
+ }
-constexpr int iArr1[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
- int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
+ ret = ret && (static_cast<std::size_t>(rlast - s.rbegin()) == s.size());
+ return ret;
+}
-int main(int, char**)
-{
- static_assert(testConstexprSpan(std::span<int>()), "");
- static_assert(testConstexprSpan(std::span<long>()), "");
- static_assert(testConstexprSpan(std::span<double>()), "");
- static_assert(testConstexprSpan(std::span<A>()), "");
- static_assert(testConstexprSpan(std::span<std::string>()), "");
-
- static_assert(testConstexprSpan(std::span<int, 0>()), "");
- static_assert(testConstexprSpan(std::span<long, 0>()), "");
- static_assert(testConstexprSpan(std::span<double, 0>()), "");
- static_assert(testConstexprSpan(std::span<A, 0>()), "");
- static_assert(testConstexprSpan(std::span<std::string, 0>()), "");
-
- static_assert(testConstexprSpan(std::span<const int>(iArr1, 1)), "");
- static_assert(testConstexprSpan(std::span<const int>(iArr1, 2)), "");
- static_assert(testConstexprSpan(std::span<const int>(iArr1, 3)), "");
- static_assert(testConstexprSpan(std::span<const int>(iArr1, 4)), "");
- static_assert(testConstexprSpan(std::span<const int>(iArr1, 5)), "");
-
+template <class EType, size_t Extent, class... Args>
+constexpr bool testSpan(Args&&... args) {
+ auto s1 = std::span<EType>(std::forward<Args>(args)...);
+ bool ret = true;
- testRuntimeSpan(std::span<int> ());
- testRuntimeSpan(std::span<long> ());
- testRuntimeSpan(std::span<double> ());
- testRuntimeSpan(std::span<A> ());
- testRuntimeSpan(std::span<std::string>());
+ ret = ret && testSpanImpl(s1, s1.rend());
+#if TEST_STD_VER >= 23
+ ret = ret && testSpanImpl(s1, s1.crend());
+#endif
- testRuntimeSpan(std::span<int, 0> ());
- testRuntimeSpan(std::span<long, 0> ());
- testRuntimeSpan(std::span<double, 0> ());
- testRuntimeSpan(std::span<A, 0> ());
- testRuntimeSpan(std::span<std::string, 0>());
+ auto s2 = std::span<EType, Extent>(std::forward<Args>(args)...);
+ ret = ret && testSpanImpl(s2, s2.rend());
+#if TEST_STD_VER >= 23
+ ret = ret && testSpanImpl(s2, s2.crend());
+#endif
- testRuntimeSpan(std::span<int>(iArr2, 1));
- testRuntimeSpan(std::span<int>(iArr2, 2));
- testRuntimeSpan(std::span<int>(iArr2, 3));
- testRuntimeSpan(std::span<int>(iArr2, 4));
- testRuntimeSpan(std::span<int>(iArr2, 5));
+ return ret;
+}
- std::string s;
- testRuntimeSpan(std::span<std::string>(&s, (std::size_t) 0));
- testRuntimeSpan(std::span<std::string>(&s, 1));
+struct A {};
+bool operator==(A, A) { return true; }
+
+constexpr int iArr1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
+int iArr2[] = {10, 11, 12, 13, 14, 15, 16, 17, 18, 19};
+
+int main(int, char**) {
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<int, 0>());
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<long, 0>());
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<double, 0>());
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<A, 0>());
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<std::string, 0>());
+
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const int, 1>(iArr1, 1));
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const int, 2>(iArr1, 2));
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const int, 3>(iArr1, 3));
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const int, 4>(iArr1, 4));
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const int, 5>(iArr1, 5));
+
+ testSpan<int, 1>(iArr2, 1);
+ testSpan<int, 2>(iArr2, 2);
+ testSpan<int, 3>(iArr2, 3);
+ testSpan<int, 4>(iArr2, 4);
+ testSpan<int, 5>(iArr2, 5);
+
+ std::string s1;
+ constexpr static std::string s2;
+ testSpan<std::string, 0>(&s1, static_cast<size_t>(0));
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const std::string, 0>(&s2, static_cast<size_t>(0)));
+ testSpan<std::string, 1>(&s1, 1);
+ ASSERT_RUNTIME_AND_CONSTEXPR(testSpan<const std::string, 1>(&s2, 1));
return 0;
}
diff --git a/libcxx/test/std/iterators/const.iterators/alias.pass.cpp b/libcxx/test/std/iterators/const.iterators/alias.pass.cpp
new file mode 100644
index 00000000000000..10c0665764cc86
--- /dev/null
+++ b/libcxx/test/std/iterators/const.iterators/alias.pass.cpp
@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+
+// std::const_iterator
+
+#include <iterator>
+#include <list>
+#include <ranges>
+#include "test_macros.h"
+
+ASSERT_SAME_TYPE(std::const_iterator<int*>, std::basic_const_iterator<int*>);
+ASSERT_SAME_TYPE(std::const_iterator<const int*>, const int*);
+ASSERT_SAME_TYPE(std::const_sentinel<int*>, std::basic_const_iterator<int*>);
+ASSERT_SAME_TYPE(std::const_sentinel<const int*>, const int*);
+ASSERT_SAME_TYPE(std::const_sentinel<std::default_sentinel_t>, std::default_sentinel_t);
+
+using list_iterator = std::list<int>::iterator;
+using list_const_iterator = std::list<int>::const_iterator;
+
+ASSERT_SAME_TYPE(std::const_iterator<list_iterator>, std::basic_const_iterator<list_iterator>);
+ASSERT_SAME_TYPE(std::const_iterator<list_const_iterator>, list_const_iterator);
+ASSERT_SAME_TYPE(std::const_sentinel<list_iterator>, std::basic_const_iterator<list_iterator>);
+ASSERT_SAME_TYPE(std::const_sentinel<list_const_iterator>, list_const_iterator);
+
+int main() { return 0; }
diff --git a/libcxx/test/std/iterators/const.iterators/iterator.pass.cpp b/libcxx/test/std/iterators/const.iterators/iterator.pass.cpp
new file mode 100644
index 00000000000000..9163976deb8f12
--- /dev/null
+++ b/libcxx/test/std/iterators/const.iterators/iterator.pass.cpp
@@ -0,0 +1,139 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+
+// std::basic_const_iterator
+
+#include <iterator>
+#include <list>
+#include <ranges>
+#include <vector>
+#include "test_macros.h"
+#include "test_iterators.h"
+#include "type_algorithms.h"
+
+template <class T>
+concept has_iterator_category = requires { typename T::iterator_category; };
+
+template <class It>
+constexpr bool check_category_and_concept() {
+ using ConstIt = std::basic_const_iterator<It>;
+
+ if constexpr (std::contiguous_iterator<It>) {
+ ASSERT_SAME_TYPE(typename ConstIt::iterator_concept, std::contiguous_iterator_tag);
+ static_assert(std::contiguous_iterator<ConstIt>);
+ } else if constexpr (std::random_access_iterator<It>) {
+ ASSERT_SAME_TYPE(typename ConstIt::iterator_concept, std::random_access_iterator_tag);
+ static_assert(!std::contiguous_iterator<ConstIt>);
+ static_assert(std::random_access_iterator<ConstIt>);
+ } else if constexpr (std::bidirectional_iterator<It>) {
+ ASSERT_SAME_TYPE(typename ConstIt::iterator_concept, std::bidirectional_iterator_tag);
+ static_assert(!std::random_access_iterator<ConstIt>);
+ static_assert(std::bidirectional_iterator<ConstIt>);
+ } else if constexpr (std::forward_iterator<It>) {
+ ASSERT_SAME_TYPE(typename ConstIt::iterator_concept, std::forward_iterator_tag);
+ static_assert(!std::bidirectional_iterator<ConstIt>);
+ static_assert(std::forward_iterator<ConstIt>);
+ } else {
+ ASSERT_SAME_TYPE(typename ConstIt::iterator_concept, std::input_iterator_tag);
+ static_assert(!std::forward_iterator<ConstIt>);
+ static_assert(std::input_iterator<ConstIt>);
+ }
+
+ if constexpr (std::forward_iterator<It>) {
+ ASSERT_SAME_TYPE(typename ConstIt::iterator_category, typename std::iterator_traits<It>::iterator_category);
+ } else {
+ static_assert(!has_iterator_category<ConstIt>);
+ }
+
+ return true;
+}
+
+constexpr bool test_p2836r1() {
+ auto f = [](std::vector<int>::const_iterator) {};
+
+ auto v = std::vector<int>();
+ {
+ auto i1 = std::ranges::cbegin(v);
+ f(i1);
+ }
+
+ auto t = v | std::views::take_while([](int const x) { return x < 100; });
+ {
+ auto i2 = std::ranges::cbegin(t);
+ f(i2);
+ }
+
+ return true;
+}
+
+constexpr bool test_basic_operations() {
+ struct S {
+ int x;
+ };
+ S arr[10] = {};
+ std::basic_const_iterator<S*> first = arr;
+ std::basic_const_iterator<S*> last = arr + 10;
+
+ for (auto it = first; it != last; ++it) {
+ (void)*it;
+ (void)it->x;
+ (void)iter_move(it);
+ }
+ static_assert(!std::is_invocable_v<decltype(std::ranges::iter_swap), decltype(first), decltype(first)>);
+
+ assert(++first == arr + 1);
+ assert(--first == arr + 0);
+ assert(first++ == arr + 0);
+ assert(first-- == arr + 1);
+
+ assert(first + 3 == arr + 3);
+ assert(last - 1 == arr + 9);
+
+ first += 3;
+ assert(first == arr + 3);
+ first -= 2;
+ assert(first == arr + 1);
+ --first;
+
+ assert(first < last);
+ assert(last > first);
+ assert(first <= last);
+ assert(last >= first);
+
+ assert(first < arr + 1);
+ assert(arr + 1 > first);
+ assert(first <= arr + 1);
+ assert(arr + 1 >= first);
+
+ assert((first <=> last) < 0);
+ assert((first <=> arr + 1) < 0);
+ assert((arr + 1 <=> first) > 0);
+
+ return true;
+}
+
+int main() {
+ types::for_each(types::cpp20_input_iterator_list<int*>{}, []<class It>() {
+ using ConstIt = std::basic_const_iterator<It>;
+ ASSERT_SAME_TYPE(typename ConstIt::value_type, int);
+ static_assert(check_category_and_concept<It>());
+
+ ASSERT_SAME_TYPE(std::iter_reference_t<ConstIt>, const int&);
+ ASSERT_SAME_TYPE(std::iter_rvalue_reference_t<ConstIt>, const int&&);
+ });
+
+ test_p2836r1();
+ static_assert(test_p2836r1());
+
+ test_basic_operations();
+ static_assert(test_basic_operations());
+
+ return 0;
+}
diff --git a/libcxx/test/std/language.support/support.limits/support.limits.general/ranges.version.compile.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/ranges.version.compile.pass.cpp
index 8493505ef0236d..df8f1c96960d2f 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/ranges.version.compile.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/ranges.version.compile.pass.cpp
@@ -19,7 +19,7 @@
__cpp_lib_default_template_type_for_algorithm_values 202403L [C++26]
__cpp_lib_ranges 202110L [C++20]
202406L [C++23]
- __cpp_lib_ranges_as_const 202207L [C++23]
+ __cpp_lib_ranges_as_const 202311L [C++23]
__cpp_lib_ranges_as_rvalue 202207L [C++23]
__cpp_lib_ranges_chunk 202202L [C++23]
__cpp_lib_ranges_chunk_by 202202L [C++23]
@@ -250,17 +250,11 @@
# error "__cpp_lib_ranges should have the value 202406L in c++23"
# endif
-# if !defined(_LIBCPP_VERSION)
-# ifndef __cpp_lib_ranges_as_const
-# error "__cpp_lib_ranges_as_const should be defined in c++23"
-# endif
-# if __cpp_lib_ranges_as_const != 202207L
-# error "__cpp_lib_ranges_as_const should have the value 202207L in c++23"
-# endif
-# else // _LIBCPP_VERSION
-# ifdef __cpp_lib_ranges_as_const
-# error "__cpp_lib_ranges_as_const should not be defined because it is unimplemented in libc++!"
-# endif
+# ifndef __cpp_lib_ranges_as_const
+# error "__cpp_lib_ranges_as_const should be defined in c++23"
+# endif
+# if __cpp_lib_ranges_as_const != 202311L
+# error "__cpp_lib_ranges_as_const should have the value 202311L in c++23"
# endif
# ifndef __cpp_lib_ranges_as_rvalue
@@ -369,17 +363,11 @@
# error "__cpp_lib_ranges should have the value 202406L in c++26"
# endif
-# if !defined(_LIBCPP_VERSION)
-# ifndef __cpp_lib_ranges_as_const
-# error "__cpp_lib_ranges_as_const should be defined in c++26"
-# endif
-# if __cpp_lib_ranges_as_const != 202207L
-# error "__cpp_lib_ranges_as_const should have the value 202207L in c++26"
-# endif
-# else // _LIBCPP_VERSION
-# ifdef __cpp_lib_ranges_as_const
-# error "__cpp_lib_ranges_as_const should not be defined because it is unimplemented in libc++!"
-# endif
+# ifndef __cpp_lib_ranges_as_const
+# error "__cpp_lib_ranges_as_const should be defined in c++26"
+# endif
+# if __cpp_lib_ranges_as_const != 202311L
+# error "__cpp_lib_ranges_as_const should have the value 202311L in c++26"
# endif
# ifndef __cpp_lib_ranges_as_rvalue
diff --git a/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp
index a022c90e166c8d..af7ce69b345d91 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp
@@ -168,7 +168,7 @@
__cpp_lib_quoted_string_io 201304L [C++14]
__cpp_lib_ranges 202110L [C++20]
202406L [C++23]
- __cpp_lib_ranges_as_const 202207L [C++23]
+ __cpp_lib_ranges_as_const 202311L [C++23]
__cpp_lib_ranges_as_rvalue 202207L [C++23]
__cpp_lib_ranges_chunk 202202L [C++23]
__cpp_lib_ranges_chunk_by 202202L [C++23]
@@ -5624,17 +5624,11 @@
# error "__cpp_lib_ranges should have the value 202406L in c++23"
# endif
-# if !defined(_LIBCPP_VERSION)
-# ifndef __cpp_lib_ranges_as_const
-# error "__cpp_lib_ranges_as_const should be defined in c++23"
-# endif
-# if __cpp_lib_ranges_as_const != 202207L
-# error "__cpp_lib_ranges_as_const should have the value 202207L in c++23"
-# endif
-# else // _LIBCPP_VERSION
-# ifdef __cpp_lib_ranges_as_const
-# error "__cpp_lib_ranges_as_const should not be defined because it is unimplemented in libc++!"
-# endif
+# ifndef __cpp_lib_ranges_as_const
+# error "__cpp_lib_ranges_as_const should be defined in c++23"
+# endif
+# if __cpp_lib_ranges_as_const != 202311L
+# error "__cpp_lib_ranges_as_const should have the value 202311L in c++23"
# endif
# ifndef __cpp_lib_ranges_as_rvalue
@@ -7475,17 +7469,11 @@
# error "__cpp_lib_ranges should have the value 202406L in c++26"
# endif
-# if !defined(_LIBCPP_VERSION)
-# ifndef __cpp_lib_ranges_as_const
-# error "__cpp_lib_ranges_as_const should be defined in c++26"
-# endif
-# if __cpp_lib_ranges_as_const != 202207L
-# error "__cpp_lib_ranges_as_const should have the value 202207L in c++26"
-# endif
-# else // _LIBCPP_VERSION
-# ifdef __cpp_lib_ranges_as_const
-# error "__cpp_lib_ranges_as_const should not be defined because it is unimplemented in libc++!"
-# endif
+# ifndef __cpp_lib_ranges_as_const
+# error "__cpp_lib_ranges_as_const should be defined in c++26"
+# endif
+# if __cpp_lib_ranges_as_const != 202311L
+# error "__cpp_lib_ranges_as_const should have the value 202311L in c++26"
# endif
# ifndef __cpp_lib_ranges_as_rvalue
diff --git a/libcxx/test/std/ranges/range.access/begin.pass.cpp b/libcxx/test/std/ranges/range.access/begin.pass.cpp
index 5ca3d59abb1407..7f2357b319a8a0 100644
--- a/libcxx/test/std/ranges/range.access/begin.pass.cpp
+++ b/libcxx/test/std/ranges/range.access/begin.pass.cpp
@@ -9,7 +9,7 @@
// UNSUPPORTED: c++03, c++11, c++14, c++17
// std::ranges::begin
-// std::ranges::cbegin
+// std::ranges::cbegin // until C++23
#include <ranges>
@@ -19,7 +19,9 @@
#include "test_iterators.h"
using RangeBeginT = decltype(std::ranges::begin);
+#if TEST_STD_VER < 23
using RangeCBeginT = decltype(std::ranges::cbegin);
+#endif // TEST_STD_VER < 23
static int globalBuff[8];
@@ -27,33 +29,43 @@ static_assert(!std::is_invocable_v<RangeBeginT, int (&&)[10]>);
static_assert( std::is_invocable_v<RangeBeginT, int (&)[10]>);
static_assert(!std::is_invocable_v<RangeBeginT, int (&&)[]>);
static_assert( std::is_invocable_v<RangeBeginT, int (&)[]>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCBeginT, int (&&)[10]>);
static_assert( std::is_invocable_v<RangeCBeginT, int (&)[10]>);
static_assert(!std::is_invocable_v<RangeCBeginT, int (&&)[]>);
static_assert( std::is_invocable_v<RangeCBeginT, int (&)[]>);
+#endif // TEST_STD_VER < 23
struct Incomplete;
static_assert(!std::is_invocable_v<RangeBeginT, Incomplete(&&)[]>);
static_assert(!std::is_invocable_v<RangeBeginT, const Incomplete(&&)[]>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCBeginT, Incomplete(&&)[]>);
static_assert(!std::is_invocable_v<RangeCBeginT, const Incomplete(&&)[]>);
+#endif // TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeBeginT, Incomplete(&&)[10]>);
static_assert(!std::is_invocable_v<RangeBeginT, const Incomplete(&&)[10]>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCBeginT, Incomplete(&&)[10]>);
static_assert(!std::is_invocable_v<RangeCBeginT, const Incomplete(&&)[10]>);
+#endif // TEST_STD_VER < 23
// This case is IFNDR; we handle it SFINAE-friendly.
LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeBeginT, Incomplete(&)[]>);
LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeBeginT, const Incomplete(&)[]>);
+#if TEST_STD_VER < 23
LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCBeginT, Incomplete(&)[]>);
LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCBeginT, const Incomplete(&)[]>);
+#endif // TEST_STD_VER < 23
// This case is IFNDR; we handle it SFINAE-friendly.
LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeBeginT, Incomplete(&)[10]>);
LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeBeginT, const Incomplete(&)[10]>);
+#if TEST_STD_VER < 23
LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCBeginT, Incomplete(&)[10]>);
LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCBeginT, const Incomplete(&)[10]>);
+#endif // TEST_STD_VER < 23
struct BeginMember {
int x;
@@ -65,45 +77,48 @@ static_assert( std::is_invocable_v<RangeBeginT, BeginMember &>);
static_assert(!std::is_invocable_v<RangeBeginT, BeginMember &&>);
static_assert( std::is_invocable_v<RangeBeginT, BeginMember const&>);
static_assert(!std::is_invocable_v<RangeBeginT, BeginMember const&&>);
+#if TEST_STD_VER < 23
static_assert( std::is_invocable_v<RangeCBeginT, BeginMember &>);
static_assert(!std::is_invocable_v<RangeCBeginT, BeginMember &&>);
static_assert( std::is_invocable_v<RangeCBeginT, BeginMember const&>);
static_assert(!std::is_invocable_v<RangeCBeginT, BeginMember const&&>);
+#endif // TEST_STD_VER < 23
constexpr bool testReturnTypes() {
- {
- int *x[2];
- ASSERT_SAME_TYPE(decltype(std::ranges::begin(x)), int**);
- ASSERT_SAME_TYPE(decltype(std::ranges::cbegin(x)), int* const*);
- }
- {
- int x[2][2];
- ASSERT_SAME_TYPE(decltype(std::ranges::begin(x)), int(*)[2]);
- ASSERT_SAME_TYPE(decltype(std::ranges::cbegin(x)), const int(*)[2]);
- }
- {
- struct Different {
- char*& begin();
- short*& begin() const;
- } x;
- ASSERT_SAME_TYPE(decltype(std::ranges::begin(x)), char*);
- ASSERT_SAME_TYPE(decltype(std::ranges::cbegin(x)), short*);
- }
+ int* a[2];
+ int b[2][2];
+ struct Different {
+ char*& begin();
+ short*& begin() const;
+ } c;
+
+ ASSERT_SAME_TYPE(decltype(std::ranges::begin(a)), int**);
+ ASSERT_SAME_TYPE(decltype(std::ranges::begin(b)), int(*)[2]);
+ ASSERT_SAME_TYPE(decltype(std::ranges::begin(c)), char*);
+
+#if TEST_STD_VER < 23
+ ASSERT_SAME_TYPE(decltype(std::ranges::cbegin(a)), int* const*);
+ ASSERT_SAME_TYPE(decltype(std::ranges::cbegin(b)), const int(*)[2]);
+ ASSERT_SAME_TYPE(decltype(std::ranges::cbegin(c)), short*);
+#endif // TEST_STD_VER < 23
+
return true;
}
constexpr bool testArray() {
int a[2];
- assert(std::ranges::begin(a) == a);
- assert(std::ranges::cbegin(a) == a);
-
int b[2][2];
- assert(std::ranges::begin(b) == b);
- assert(std::ranges::cbegin(b) == b);
-
BeginMember c[2];
+
+ assert(std::ranges::begin(a) == a);
+ assert(std::ranges::begin(b) == b);
assert(std::ranges::begin(c) == c);
+
+#if TEST_STD_VER < 23
+ assert(std::ranges::cbegin(a) == a);
+ assert(std::ranges::cbegin(b) == b);
assert(std::ranges::cbegin(c) == c);
+#endif // TEST_STD_VER < 23
return true;
}
@@ -136,8 +151,10 @@ struct NonConstBeginMember {
};
static_assert( std::is_invocable_v<RangeBeginT, NonConstBeginMember &>);
static_assert(!std::is_invocable_v<RangeBeginT, NonConstBeginMember const&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCBeginT, NonConstBeginMember &>);
static_assert(!std::is_invocable_v<RangeCBeginT, NonConstBeginMember const&>);
+#endif // TEST_STD_VER < 23
struct EnabledBorrowingBeginMember {
constexpr int *begin() const { return &globalBuff[0]; }
@@ -159,28 +176,28 @@ struct EmptyPtrBeginMember {
constexpr bool testBeginMember() {
BeginMember a;
+ NonConstBeginMember b;
+ EnabledBorrowingBeginMember c;
+ BeginMemberFunction d;
+ EmptyPtrBeginMember e;
+
assert(std::ranges::begin(a) == &a.x);
- assert(std::ranges::cbegin(a) == &a.x);
static_assert(!std::is_invocable_v<RangeBeginT, BeginMember&&>);
- static_assert(!std::is_invocable_v<RangeCBeginT, BeginMember&&>);
-
- NonConstBeginMember b;
assert(std::ranges::begin(b) == &b.x);
- static_assert(!std::is_invocable_v<RangeCBeginT, NonConstBeginMember&>);
-
- EnabledBorrowingBeginMember c;
assert(std::ranges::begin(c) == &globalBuff[0]);
- assert(std::ranges::cbegin(c) == &globalBuff[0]);
assert(std::ranges::begin(std::move(c)) == &globalBuff[0]);
- assert(std::ranges::cbegin(std::move(c)) == &globalBuff[0]);
-
- BeginMemberFunction d;
assert(std::ranges::begin(d) == &d.x);
- assert(std::ranges::cbegin(d) == &d.x);
-
- EmptyPtrBeginMember e;
assert(std::ranges::begin(e) == &e.x);
+
+#if TEST_STD_VER < 23
+ assert(std::ranges::cbegin(a) == &a.x);
+ static_assert(!std::is_invocable_v<RangeCBeginT, BeginMember&&>);
+ static_assert(!std::is_invocable_v<RangeCBeginT, NonConstBeginMember&>);
+ assert(std::ranges::cbegin(c) == &globalBuff[0]);
+ assert(std::ranges::cbegin(std::move(c)) == &globalBuff[0]);
+ assert(std::ranges::cbegin(d) == &d.x);
assert(std::ranges::cbegin(e) == &e.x);
+#endif // TEST_STD_VER < 23
return true;
}
@@ -193,8 +210,10 @@ struct BeginFunction {
static_assert( std::is_invocable_v<RangeBeginT, BeginFunction const&>);
static_assert(!std::is_invocable_v<RangeBeginT, BeginFunction &&>);
static_assert(std::is_invocable_v<RangeBeginT, BeginFunction&>); // Ill-formed before P2602R2 Poison Pills are Too Toxic
+#if TEST_STD_VER < 23
static_assert( std::is_invocable_v<RangeCBeginT, BeginFunction const&>);
static_assert( std::is_invocable_v<RangeCBeginT, BeginFunction &>);
+#endif // TEST_STD_VER < 23
struct BeginFunctionReturnsInt {
friend int begin(BeginFunctionReturnsInt const&);
@@ -215,7 +234,9 @@ static_assert(!std::is_invocable_v<RangeBeginT, BeginFunctionReturnsPtrConvertib
struct BeginFunctionByValue {
friend constexpr int *begin(BeginFunctionByValue) { return &globalBuff[1]; }
};
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCBeginT, BeginFunctionByValue>);
+#endif // TEST_STD_VER < 23
struct BeginFunctionEnabledBorrowing {
friend constexpr int *begin(BeginFunctionEnabledBorrowing) { return &globalBuff[2]; }
@@ -245,85 +266,96 @@ struct BeginFunctionWithPrivateBeginMember {
constexpr bool testBeginFunction() {
BeginFunction a{};
const BeginFunction aa{};
- assert(std::ranges::begin(a) == &a.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
- assert(std::ranges::cbegin(a) == &a.x);
- assert(std::ranges::begin(aa) == &aa.x);
- assert(std::ranges::cbegin(aa) == &aa.x);
-
BeginFunctionByValue b{};
const BeginFunctionByValue bb{};
- assert(std::ranges::begin(b) == &globalBuff[1]);
- assert(std::ranges::cbegin(b) == &globalBuff[1]);
- assert(std::ranges::begin(bb) == &globalBuff[1]);
- assert(std::ranges::cbegin(bb) == &globalBuff[1]);
-
BeginFunctionEnabledBorrowing c{};
const BeginFunctionEnabledBorrowing cc{};
- assert(std::ranges::begin(std::move(c)) == &globalBuff[2]);
- assert(std::ranges::cbegin(std::move(c)) == &globalBuff[2]);
- assert(std::ranges::begin(std::move(cc)) == &globalBuff[2]);
- assert(std::ranges::cbegin(std::move(cc)) == &globalBuff[2]);
-
BeginFunctionReturnsEmptyPtr d{};
const BeginFunctionReturnsEmptyPtr dd{};
- assert(std::ranges::begin(d) == &d.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
- assert(std::ranges::cbegin(d) == &d.x);
- assert(std::ranges::begin(dd) == &dd.x);
- assert(std::ranges::cbegin(dd) == &dd.x);
-
BeginFunctionWithDataMember e{};
const BeginFunctionWithDataMember ee{};
+ BeginFunctionWithPrivateBeginMember f{};
+ const BeginFunctionWithPrivateBeginMember ff{};
+
+ assert(std::ranges::begin(a) == &a.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
+ assert(std::ranges::begin(aa) == &aa.x);
+ assert(std::ranges::begin(b) == &globalBuff[1]);
+ assert(std::ranges::begin(bb) == &globalBuff[1]);
+ assert(std::ranges::begin(std::move(c)) == &globalBuff[2]);
+ assert(std::ranges::begin(std::move(cc)) == &globalBuff[2]);
+ assert(std::ranges::begin(d) == &d.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
+ assert(std::ranges::begin(dd) == &dd.x);
assert(std::ranges::begin(e) == &e.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
assert(std::ranges::begin(ee) == &ee.x);
+ assert(std::ranges::begin(f) == &f.y); // Ill-formed before P2602R2 Poison Pills are Too Toxic
+ assert(std::ranges::begin(ff) == &ff.y);
+
+#if TEST_STD_VER < 23
+ assert(std::ranges::cbegin(a) == &a.x);
+ assert(std::ranges::cbegin(aa) == &aa.x);
+ assert(std::ranges::cbegin(b) == &globalBuff[1]);
+ assert(std::ranges::cbegin(bb) == &globalBuff[1]);
+ assert(std::ranges::cbegin(std::move(c)) == &globalBuff[2]);
+ assert(std::ranges::cbegin(std::move(cc)) == &globalBuff[2]);
+ assert(std::ranges::cbegin(d) == &d.x);
+ assert(std::ranges::cbegin(dd) == &dd.x);
assert(std::ranges::cbegin(e) == &e.x);
assert(std::ranges::cbegin(ee) == &ee.x);
-
- BeginFunctionWithPrivateBeginMember f{};
- const BeginFunctionWithPrivateBeginMember ff{};
- assert(std::ranges::begin(f) == &f.y); // Ill-formed before P2602R2 Poison Pills are Too Toxic
assert(std::ranges::cbegin(f) == &f.y);
- assert(std::ranges::begin(ff) == &ff.y);
assert(std::ranges::cbegin(ff) == &ff.y);
+#endif // TEST_STD_VER < 23
return true;
}
ASSERT_NOEXCEPT(std::ranges::begin(std::declval<int (&)[10]>()));
+#if TEST_STD_VER < 23
ASSERT_NOEXCEPT(std::ranges::cbegin(std::declval<int (&)[10]>()));
+#endif // TEST_STD_VER < 23
struct NoThrowMemberBegin {
ThrowingIterator<int> begin() const noexcept; // auto(t.begin()) doesn't throw
} ntmb;
static_assert(noexcept(std::ranges::begin(ntmb)));
+#if TEST_STD_VER < 23
static_assert(noexcept(std::ranges::cbegin(ntmb)));
+#endif // TEST_STD_VER < 23
struct NoThrowADLBegin {
friend ThrowingIterator<int> begin(NoThrowADLBegin&) noexcept; // auto(begin(t)) doesn't throw
friend ThrowingIterator<int> begin(const NoThrowADLBegin&) noexcept;
} ntab;
static_assert(noexcept(std::ranges::begin(ntab)));
+#if TEST_STD_VER < 23
static_assert(noexcept(std::ranges::cbegin(ntab)));
+#endif // TEST_STD_VER < 23
struct NoThrowMemberBeginReturnsRef {
ThrowingIterator<int>& begin() const noexcept; // auto(t.begin()) may throw
} ntmbrr;
static_assert(!noexcept(std::ranges::begin(ntmbrr)));
+#if TEST_STD_VER < 23
static_assert(!noexcept(std::ranges::cbegin(ntmbrr)));
+#endif // TEST_STD_VER < 23
struct BeginReturnsArrayRef {
auto begin() const noexcept -> int(&)[10];
} brar;
static_assert(noexcept(std::ranges::begin(brar)));
+#if TEST_STD_VER < 23
static_assert(noexcept(std::ranges::cbegin(brar)));
+#endif // TEST_STD_VER < 23
// Test ADL-proofing.
struct Incomplete;
template<class T> struct Holder { T t; };
static_assert(!std::is_invocable_v<RangeBeginT, Holder<Incomplete>*>);
static_assert(!std::is_invocable_v<RangeBeginT, Holder<Incomplete>*&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCBeginT, Holder<Incomplete>*>);
static_assert(!std::is_invocable_v<RangeCBeginT, Holder<Incomplete>*&>);
+#endif // TEST_STD_VER < 23
int main(int, char**) {
static_assert(testReturnTypes());
diff --git a/libcxx/test/std/ranges/range.access/cbegin.pass.cpp b/libcxx/test/std/ranges/range.access/cbegin.pass.cpp
new file mode 100644
index 00000000000000..a2da7cdf3b6d39
--- /dev/null
+++ b/libcxx/test/std/ranges/range.access/cbegin.pass.cpp
@@ -0,0 +1,207 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+
+// std::ranges::cbegin
+// std::ranges::crbegin
+
+#include <ranges>
+
+#include <cassert>
+#include <utility>
+#include "almost_satisfies_types.h"
+#include "test_macros.h"
+#include "test_iterators.h"
+
+using RangeCBeginT = decltype(std::ranges::cbegin);
+using RangeCRBeginT = decltype(std::ranges::crbegin);
+
+static_assert(!std::is_invocable_v<RangeCBeginT, int (&&)[10]>);
+static_assert(std::is_invocable_v<RangeCBeginT, int (&)[10]>);
+static_assert(!std::is_invocable_v<RangeCBeginT, int (&&)[]>);
+static_assert(!std::is_invocable_v<RangeCBeginT, int (&)[]>);
+static_assert(!std::is_invocable_v<RangeCRBeginT, int (&&)[10]>);
+static_assert(std::is_invocable_v<RangeCRBeginT, int (&)[10]>);
+static_assert(!std::is_invocable_v<RangeCRBeginT, int (&&)[]>);
+static_assert(!std::is_invocable_v<RangeCRBeginT, int (&)[]>);
+
+static_assert(!std::is_invocable_v<RangeCBeginT, InputRangeNotDerivedFrom>);
+static_assert(!std::is_invocable_v<RangeCBeginT, InputRangeNotIndirectlyReadable>);
+static_assert(!std::is_invocable_v<RangeCBeginT, InputRangeNotInputOrOutputIterator>);
+static_assert(!std::is_invocable_v<RangeCBeginT, InputRangeNotSentinelSemiregular>);
+static_assert(!std::is_invocable_v<RangeCBeginT, InputRangeNotSentinelEqualityComparableWith>);
+
+static_assert(!std::is_invocable_v<RangeCRBeginT, BidirectionalRangeNotDerivedFrom>);
+static_assert(!std::is_invocable_v<RangeCRBeginT, BidirectionalRangeNotSentinelSemiregular>);
+static_assert(!std::is_invocable_v<RangeCRBeginT, BidirectionalRangeNotSentinelWeaklyEqualityComparableWith>);
+static_assert(!std::is_invocable_v<RangeCRBeginT, BidirectionalRangeNotDecrementable>);
+
+struct Incomplete;
+
+static_assert(!std::is_invocable_v<RangeCBeginT, Incomplete (&&)[]>);
+static_assert(!std::is_invocable_v<RangeCBeginT, const Incomplete (&&)[]>);
+static_assert(!std::is_invocable_v<RangeCBeginT, Incomplete (&&)[10]>);
+static_assert(!std::is_invocable_v<RangeCBeginT, const Incomplete (&&)[10]>);
+
+static_assert(!std::is_invocable_v<RangeCRBeginT, Incomplete (&&)[]>);
+static_assert(!std::is_invocable_v<RangeCRBeginT, const Incomplete (&&)[]>);
+static_assert(!std::is_invocable_v<RangeCRBeginT, Incomplete (&&)[10]>);
+static_assert(!std::is_invocable_v<RangeCRBeginT, const Incomplete (&&)[10]>);
+
+// This case is IFNDR; we handle it SFINAE-friendly.
+LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCBeginT, Incomplete (&)[]>);
+LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCBeginT, const Incomplete (&)[]>);
+LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCRBeginT, Incomplete (&)[]>);
+LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCRBeginT, const Incomplete (&)[]>);
+
+// This case is IFNDR; we handle it SFINAE-friendly.
+LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCBeginT, Incomplete (&)[10]>);
+LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCBeginT, const Incomplete (&)[10]>);
+LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCRBeginT, Incomplete (&)[10]>);
+LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCRBeginT, const Incomplete (&)[10]>);
+
+struct NonborrowingRange {
+ int x;
+ constexpr const int* begin() const { return &x; }
+ constexpr const int* rbegin() const { return &x; }
+ constexpr const int* end() const { return &x; }
+ constexpr const int* rend() const { return &x; }
+};
+
+// Ensure that we can't call with rvalues with borrowing disabled.
+static_assert(std::is_invocable_v<RangeCBeginT, NonborrowingRange&>);
+static_assert(!std::is_invocable_v<RangeCBeginT, NonborrowingRange&&>);
+static_assert(std::is_invocable_v<RangeCBeginT, NonborrowingRange const&>);
+static_assert(!std::is_invocable_v<RangeCBeginT, NonborrowingRange const&&>);
+static_assert(std::is_invocable_v<RangeCRBeginT, NonborrowingRange&>);
+static_assert(!std::is_invocable_v<RangeCRBeginT, NonborrowingRange&&>);
+static_assert(std::is_invocable_v<RangeCRBeginT, NonborrowingRange const&>);
+static_assert(!std::is_invocable_v<RangeCRBeginT, NonborrowingRange const&&>);
+
+constexpr bool testReturnTypes() {
+ int* a[2];
+ int b[2][2];
+ struct PossiblyConstRange {
+ char*& begin();
+ char*& end();
+ const short*& begin() const;
+ const short*& end() const;
+ int*& rbegin();
+ int*& rend();
+ const long*& rbegin() const;
+ const long*& rend() const;
+ } c;
+ struct AlwaysConstRange {
+ const char*& begin();
+ const char*& end();
+ const short*& begin() const;
+ const short*& end() const;
+ const int*& rbegin();
+ const int*& rend();
+ const long*& rbegin() const;
+ const long*& rend() const;
+ } d;
+ struct NeverConstRange {
+ char*& begin();
+ char*& end();
+ short*& begin() const;
+ short& end() const;
+ int*& rbegin();
+ int*& rend();
+ long*& rbegin() const;
+ long*& rend() const;
+ } e;
+
+ static_assert(!std::ranges::constant_range<PossiblyConstRange>);
+ static_assert(std::ranges::constant_range<const PossiblyConstRange>);
+ static_assert(std::ranges::constant_range<AlwaysConstRange>);
+ static_assert(std::ranges::constant_range<const AlwaysConstRange>);
+ static_assert(!std::ranges::constant_range<NeverConstRange>);
+ static_assert(!std::ranges::constant_range<const NeverConstRange>);
+
+ ASSERT_SAME_TYPE(decltype(std::ranges::cbegin(a)), int* const*);
+ ASSERT_SAME_TYPE(decltype(std::ranges::cbegin(b)), const int(*)[2]);
+ ASSERT_SAME_TYPE(decltype(std::ranges::cbegin(c)), const short*);
+ ASSERT_SAME_TYPE(decltype(std::ranges::cbegin(d)), const char*);
+ ASSERT_SAME_TYPE(decltype(std::ranges::cbegin(e)), std::basic_const_iterator<char*>);
+
+ ASSERT_SAME_TYPE(decltype(std::ranges::crbegin(a)), std::reverse_iterator<int* const*>);
+ ASSERT_SAME_TYPE(decltype(std::ranges::crbegin(b)), std::reverse_iterator<const int(*)[2]>);
+ ASSERT_SAME_TYPE(decltype(std::ranges::crbegin(c)), const long*);
+ ASSERT_SAME_TYPE(decltype(std::ranges::crbegin(d)), const int*);
+ ASSERT_SAME_TYPE(decltype(std::ranges::crbegin(e)), std::basic_const_iterator<int*>);
+
+ return true;
+}
+
+constexpr bool testArray() {
+ int a[2];
+ int b[2][2];
+ NonborrowingRange c[2];
+
+ assert(std::ranges::cbegin(a) == a);
+ assert(std::ranges::cbegin(b) == b);
+ assert(std::ranges::cbegin(c) == c);
+
+ assert(std::ranges::crbegin(a).base() == a + 2);
+ assert(std::ranges::crbegin(b).base() == b + 2);
+ assert(std::ranges::crbegin(c).base() == c + 2);
+
+ return true;
+}
+
+struct BorrowingRange {
+ int* begin() const;
+ int* end() const;
+};
+template <>
+inline constexpr bool std::ranges::enable_borrowed_range<BorrowingRange> = true;
+
+static_assert(std::is_invocable_v<RangeCBeginT, BorrowingRange>);
+static_assert(std::is_invocable_v<RangeCBeginT, const BorrowingRange>);
+static_assert(std::is_invocable_v<RangeCBeginT, BorrowingRange&>);
+static_assert(std::is_invocable_v<RangeCBeginT, const BorrowingRange&>);
+static_assert(std::is_invocable_v<RangeCRBeginT, BorrowingRange>);
+static_assert(std::is_invocable_v<RangeCRBeginT, const BorrowingRange>);
+static_assert(std::is_invocable_v<RangeCRBeginT, BorrowingRange&>);
+static_assert(std::is_invocable_v<RangeCRBeginT, const BorrowingRange&>);
+
+struct NoThrowBeginThrowingEnd {
+ const int* begin() const noexcept;
+ const int* end() const;
+} ntbte;
+static_assert(noexcept(std::ranges::cbegin(ntbte)));
+static_assert(!noexcept(std::ranges::crbegin(ntbte)));
+
+struct ThrowingBeginNoThrowEnd {
+ const int* begin() const;
+ const int* end() const noexcept;
+} tbnte;
+static_assert(!noexcept(std::ranges::cbegin(tbnte)));
+static_assert(noexcept(std::ranges::crbegin(tbnte)));
+
+// Test ADL-proofing.
+struct Incomplete;
+template <class T>
+struct Holder {
+ T t;
+};
+static_assert(!std::is_invocable_v<RangeCBeginT, Holder<Incomplete>*>);
+static_assert(!std::is_invocable_v<RangeCBeginT, Holder<Incomplete>*&>);
+static_assert(!std::is_invocable_v<RangeCRBeginT, Holder<Incomplete>*>);
+static_assert(!std::is_invocable_v<RangeCRBeginT, Holder<Incomplete>*&>);
+
+int main(int, char**) {
+ static_assert(testReturnTypes());
+
+ testArray();
+ static_assert(testArray());
+
+ return 0;
+}
diff --git a/libcxx/test/std/ranges/range.access/cbegin.verify.cpp b/libcxx/test/std/ranges/range.access/cbegin.verify.cpp
new file mode 100644
index 00000000000000..18ac8ae65e3383
--- /dev/null
+++ b/libcxx/test/std/ranges/range.access/cbegin.verify.cpp
@@ -0,0 +1,25 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+
+// std::ranges::cbegin
+
+#include <ranges>
+
+struct NonBorrowedRange {
+ int* begin() const;
+ int* end() const;
+};
+static_assert(!std::ranges::enable_borrowed_range<NonBorrowedRange>);
+
+// Verify that if the expression is an rvalue and `enable_borrowed_range` is false, `ranges::cbegin` is ill-formed.
+void test() {
+ std::ranges::cbegin(NonBorrowedRange());
+ // expected-error-re at -1 {{{{no matching function for call to object of type 'const (std::ranges::)?__cbegin::__fn'}}}}
+}
diff --git a/libcxx/test/std/ranges/range.access/cend.pass.cpp b/libcxx/test/std/ranges/range.access/cend.pass.cpp
new file mode 100644
index 00000000000000..86cb8ac160eb37
--- /dev/null
+++ b/libcxx/test/std/ranges/range.access/cend.pass.cpp
@@ -0,0 +1,207 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+
+// std::ranges::cend
+// std::ranges::crend
+
+#include <ranges>
+
+#include <cassert>
+#include <utility>
+#include "almost_satisfies_types.h"
+#include "test_macros.h"
+#include "test_iterators.h"
+
+using RangeCEndT = decltype(std::ranges::cend);
+using RangeCREndT = decltype(std::ranges::crend);
+
+static_assert(!std::is_invocable_v<RangeCEndT, int (&&)[10]>);
+static_assert(std::is_invocable_v<RangeCEndT, int (&)[10]>);
+static_assert(!std::is_invocable_v<RangeCEndT, int (&&)[]>);
+static_assert(!std::is_invocable_v<RangeCEndT, int (&)[]>);
+static_assert(!std::is_invocable_v<RangeCREndT, int (&&)[10]>);
+static_assert(std::is_invocable_v<RangeCREndT, int (&)[10]>);
+static_assert(!std::is_invocable_v<RangeCREndT, int (&&)[]>);
+static_assert(!std::is_invocable_v<RangeCREndT, int (&)[]>);
+
+static_assert(!std::is_invocable_v<RangeCEndT, InputRangeNotDerivedFrom>);
+static_assert(!std::is_invocable_v<RangeCEndT, InputRangeNotIndirectlyReadable>);
+static_assert(!std::is_invocable_v<RangeCEndT, InputRangeNotInputOrOutputIterator>);
+static_assert(!std::is_invocable_v<RangeCEndT, InputRangeNotSentinelSemiregular>);
+static_assert(!std::is_invocable_v<RangeCEndT, InputRangeNotSentinelEqualityComparableWith>);
+
+static_assert(!std::is_invocable_v<RangeCREndT, BidirectionalRangeNotDerivedFrom>);
+static_assert(!std::is_invocable_v<RangeCREndT, BidirectionalRangeNotSentinelSemiregular>);
+static_assert(!std::is_invocable_v<RangeCREndT, BidirectionalRangeNotSentinelWeaklyEqualityComparableWith>);
+static_assert(!std::is_invocable_v<RangeCREndT, BidirectionalRangeNotDecrementable>);
+
+struct Incomplete;
+
+static_assert(!std::is_invocable_v<RangeCEndT, Incomplete (&&)[]>);
+static_assert(!std::is_invocable_v<RangeCEndT, const Incomplete (&&)[]>);
+static_assert(!std::is_invocable_v<RangeCEndT, Incomplete (&&)[10]>);
+static_assert(!std::is_invocable_v<RangeCEndT, const Incomplete (&&)[10]>);
+
+static_assert(!std::is_invocable_v<RangeCREndT, Incomplete (&&)[]>);
+static_assert(!std::is_invocable_v<RangeCREndT, const Incomplete (&&)[]>);
+static_assert(!std::is_invocable_v<RangeCREndT, Incomplete (&&)[10]>);
+static_assert(!std::is_invocable_v<RangeCREndT, const Incomplete (&&)[10]>);
+
+// This case is IFNDR; we handle it SFINAE-friendly.
+LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCEndT, Incomplete (&)[]>);
+LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCEndT, const Incomplete (&)[]>);
+LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCREndT, Incomplete (&)[]>);
+LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCREndT, const Incomplete (&)[]>);
+
+// This case is IFNDR; we handle it SFINAE-friendly.
+LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCEndT, Incomplete (&)[10]>);
+LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCEndT, const Incomplete (&)[10]>);
+LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCREndT, Incomplete (&)[10]>);
+LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCREndT, const Incomplete (&)[10]>);
+
+struct NonborrowingRange {
+ int x;
+ constexpr const int* begin() const { return &x; }
+ constexpr const int* rbegin() const { return &x; }
+ constexpr const int* end() const { return &x; }
+ constexpr const int* rend() const { return &x; }
+};
+
+// Ensure that we can't call with rvalues with borrowing disabled.
+static_assert(std::is_invocable_v<RangeCEndT, NonborrowingRange&>);
+static_assert(!std::is_invocable_v<RangeCEndT, NonborrowingRange&&>);
+static_assert(std::is_invocable_v<RangeCEndT, NonborrowingRange const&>);
+static_assert(!std::is_invocable_v<RangeCEndT, NonborrowingRange const&&>);
+static_assert(std::is_invocable_v<RangeCREndT, NonborrowingRange&>);
+static_assert(!std::is_invocable_v<RangeCREndT, NonborrowingRange&&>);
+static_assert(std::is_invocable_v<RangeCREndT, NonborrowingRange const&>);
+static_assert(!std::is_invocable_v<RangeCREndT, NonborrowingRange const&&>);
+
+constexpr bool testReturnTypes() {
+ int* a[2];
+ int b[2][2];
+ struct PossiblyConstRange {
+ char*& begin();
+ char*& end();
+ const short*& begin() const;
+ const short*& end() const;
+ int*& rbegin();
+ int*& rend();
+ const long*& rbegin() const;
+ const long*& rend() const;
+ } c;
+ struct AlwaysConstRange {
+ const char*& begin();
+ const char*& end();
+ const short*& begin() const;
+ const short*& end() const;
+ const int*& rbegin();
+ const int*& rend();
+ const long*& rbegin() const;
+ const long*& rend() const;
+ } d;
+ struct NeverConstRange {
+ char*& begin();
+ char*& end();
+ short*& begin() const;
+ short& end() const;
+ int*& rbegin();
+ int*& rend();
+ long*& rbegin() const;
+ long*& rend() const;
+ } e;
+
+ static_assert(!std::ranges::constant_range<PossiblyConstRange>);
+ static_assert(std::ranges::constant_range<const PossiblyConstRange>);
+ static_assert(std::ranges::constant_range<AlwaysConstRange>);
+ static_assert(std::ranges::constant_range<const AlwaysConstRange>);
+ static_assert(!std::ranges::constant_range<NeverConstRange>);
+ static_assert(!std::ranges::constant_range<const NeverConstRange>);
+
+ ASSERT_SAME_TYPE(decltype(std::ranges::cend(a)), int* const*);
+ ASSERT_SAME_TYPE(decltype(std::ranges::cend(b)), const int(*)[2]);
+ ASSERT_SAME_TYPE(decltype(std::ranges::cend(c)), const short*);
+ ASSERT_SAME_TYPE(decltype(std::ranges::cend(d)), const char*);
+ ASSERT_SAME_TYPE(decltype(std::ranges::cend(e)), std::basic_const_iterator<char*>);
+
+ ASSERT_SAME_TYPE(decltype(std::ranges::crend(a)), std::reverse_iterator<int* const*>);
+ ASSERT_SAME_TYPE(decltype(std::ranges::crend(b)), std::reverse_iterator<const int(*)[2]>);
+ ASSERT_SAME_TYPE(decltype(std::ranges::crend(c)), const long*);
+ ASSERT_SAME_TYPE(decltype(std::ranges::crend(d)), const int*);
+ ASSERT_SAME_TYPE(decltype(std::ranges::crend(e)), std::basic_const_iterator<int*>);
+
+ return true;
+}
+
+constexpr bool testArray() {
+ int a[2];
+ int b[2][2];
+ NonborrowingRange c[2];
+
+ assert(std::ranges::cend(a) == a + 2);
+ assert(std::ranges::cend(b) == b + 2);
+ assert(std::ranges::cend(c) == c + 2);
+
+ assert(std::ranges::crend(a).base() == a);
+ assert(std::ranges::crend(b).base() == b);
+ assert(std::ranges::crend(c).base() == c);
+
+ return true;
+}
+
+struct BorrowingRange {
+ int* begin() const;
+ int* end() const;
+};
+template <>
+inline constexpr bool std::ranges::enable_borrowed_range<BorrowingRange> = true;
+
+static_assert(std::is_invocable_v<RangeCEndT, BorrowingRange>);
+static_assert(std::is_invocable_v<RangeCEndT, const BorrowingRange>);
+static_assert(std::is_invocable_v<RangeCEndT, BorrowingRange&>);
+static_assert(std::is_invocable_v<RangeCEndT, const BorrowingRange&>);
+static_assert(std::is_invocable_v<RangeCREndT, BorrowingRange>);
+static_assert(std::is_invocable_v<RangeCREndT, const BorrowingRange>);
+static_assert(std::is_invocable_v<RangeCREndT, BorrowingRange&>);
+static_assert(std::is_invocable_v<RangeCREndT, const BorrowingRange&>);
+
+struct NoThrowEndThrowingEnd {
+ const int* begin() const noexcept;
+ const int* end() const;
+} ntbte;
+static_assert(!noexcept(std::ranges::cend(ntbte)));
+static_assert(noexcept(std::ranges::crend(ntbte)));
+
+struct ThrowingEndNoThrowEnd {
+ const int* begin() const;
+ const int* end() const noexcept;
+} tbnte;
+static_assert(noexcept(std::ranges::cend(tbnte)));
+static_assert(!noexcept(std::ranges::crend(tbnte)));
+
+// Test ADL-proofing.
+struct Incomplete;
+template <class T>
+struct Holder {
+ T t;
+};
+static_assert(!std::is_invocable_v<RangeCEndT, Holder<Incomplete>*>);
+static_assert(!std::is_invocable_v<RangeCEndT, Holder<Incomplete>*&>);
+static_assert(!std::is_invocable_v<RangeCREndT, Holder<Incomplete>*>);
+static_assert(!std::is_invocable_v<RangeCREndT, Holder<Incomplete>*&>);
+
+int main(int, char**) {
+ static_assert(testReturnTypes());
+
+ testArray();
+ static_assert(testArray());
+
+ return 0;
+}
diff --git a/libcxx/test/std/ranges/range.access/cend.verify.cpp b/libcxx/test/std/ranges/range.access/cend.verify.cpp
new file mode 100644
index 00000000000000..e50b90b4fbd490
--- /dev/null
+++ b/libcxx/test/std/ranges/range.access/cend.verify.cpp
@@ -0,0 +1,25 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+
+// std::ranges::cend
+
+#include <ranges>
+
+struct NonBorrowedRange {
+ int* begin() const;
+ int* end() const;
+};
+static_assert(!std::ranges::enable_borrowed_range<NonBorrowedRange>);
+
+// Verify that if the expression is an rvalue and `enable_borrowed_range` is false, `ranges::cend` is ill-formed.
+void test() {
+ std::ranges::cend(NonBorrowedRange());
+ // expected-error-re at -1 {{{{no matching function for call to object of type 'const (std::ranges::)?__cend::__fn'}}}}
+}
diff --git a/libcxx/test/std/ranges/range.access/data.pass.cpp b/libcxx/test/std/ranges/range.access/data.pass.cpp
index 357e52a1462751..03bbaf0b1ca0f5 100644
--- a/libcxx/test/std/ranges/range.access/data.pass.cpp
+++ b/libcxx/test/std/ranges/range.access/data.pass.cpp
@@ -9,6 +9,7 @@
// UNSUPPORTED: c++03, c++11, c++14, c++17
// std::ranges::data
+// std::ranges::cdata
#include <ranges>
@@ -20,6 +21,14 @@
using RangeDataT = decltype(std::ranges::data);
using RangeCDataT = decltype(std::ranges::cdata);
+#if TEST_STD_VER < 23
+# define STD_VER_20(...) __VA_ARGS__
+# define STD_VER_23(...) static_assert(true)
+#else
+# define STD_VER_20(...) static_assert(true)
+# define STD_VER_23(...) __VA_ARGS__
+#endif
+
static int globalBuff[2];
struct Incomplete;
@@ -38,9 +47,26 @@ static_assert(!std::is_invocable_v<RangeCDataT, int [1]>);
static_assert(!std::is_invocable_v<RangeCDataT, int (&&)[1]>);
static_assert( std::is_invocable_v<RangeCDataT, int (&)[1]>);
+struct DataMemberNonRange {
+ int x;
+ constexpr const int* data() const { return &x; }
+};
+static_assert(std::is_invocable_v<RangeDataT, DataMemberNonRange&>);
+static_assert(!std::is_invocable_v<RangeDataT, DataMemberNonRange&&>);
+static_assert(std::is_invocable_v<RangeDataT, DataMemberNonRange const&>);
+static_assert(!std::is_invocable_v<RangeDataT, DataMemberNonRange const&&>);
+#if TEST_STD_VER < 23
+static_assert(std::is_invocable_v<RangeCDataT, DataMemberNonRange&>);
+static_assert(!std::is_invocable_v<RangeCDataT, DataMemberNonRange&&>);
+static_assert(std::is_invocable_v<RangeCDataT, DataMemberNonRange const&>);
+static_assert(!std::is_invocable_v<RangeCDataT, DataMemberNonRange const&&>);
+#endif
+
struct DataMember {
int x;
constexpr const int *data() const { return &x; }
+ const int* begin() const;
+ const int* end() const;
};
static_assert( std::is_invocable_v<RangeDataT, DataMember &>);
static_assert(!std::is_invocable_v<RangeDataT, DataMember &&>);
@@ -66,16 +92,51 @@ constexpr bool testReturnTypes() {
struct D {
char*& data();
short*& data() const;
+ int* begin();
+ int* end();
};
ASSERT_SAME_TYPE(decltype(std::ranges::data(std::declval<D&>())), char*);
static_assert(!std::is_invocable_v<RangeDataT, D&&>);
ASSERT_SAME_TYPE(decltype(std::ranges::data(std::declval<const D&>())), short*);
static_assert(!std::is_invocable_v<RangeDataT, const D&&>);
- ASSERT_SAME_TYPE(decltype(std::ranges::cdata(std::declval<D&>())), short*);
+
+ static_assert(!std::is_invocable_v<RangeCDataT, D&&>);
+ static_assert(!std::is_invocable_v<RangeCDataT, const D&&>);
+ STD_VER_20(ASSERT_SAME_TYPE(decltype(std::ranges::cdata(std::declval<D&>())), short*));
+ STD_VER_23(ASSERT_SAME_TYPE(decltype(std::ranges::cdata(std::declval<D&>())), const char*));
+ STD_VER_20(ASSERT_SAME_TYPE(decltype(std::ranges::cdata(std::declval<const D&>())), short*));
+ STD_VER_23(static_assert(!std::is_invocable_v<RangeCDataT, const D&>));
+ }
+#if TEST_STD_VER >= 23
+ {
+ struct D {
+ char*& data();
+ short*& data() const;
+ int* begin();
+ int* end();
+ int* begin() const;
+ int* end() const;
+ };
+ ASSERT_SAME_TYPE(decltype(std::ranges::cdata(std::declval<D&>())), const char*);
+ static_assert(!std::is_invocable_v<RangeCDataT, D&&>);
+ ASSERT_SAME_TYPE(decltype(std::ranges::cdata(std::declval<const D&>())), const short*);
+ static_assert(!std::is_invocable_v<RangeCDataT, const D&&>);
+ }
+ {
+ struct D {
+ char*& data();
+ short*& data() const;
+ int* begin();
+ int* end();
+ const int* begin() const;
+ const int* end() const;
+ };
+ ASSERT_SAME_TYPE(decltype(std::ranges::cdata(std::declval<D&>())), const short*);
static_assert(!std::is_invocable_v<RangeCDataT, D&&>);
- ASSERT_SAME_TYPE(decltype(std::ranges::cdata(std::declval<const D&>())), short*);
+ ASSERT_SAME_TYPE(decltype(std::ranges::cdata(std::declval<const D&>())), const short*);
static_assert(!std::is_invocable_v<RangeCDataT, const D&&>);
}
+#endif // TEST_STD_VER >= 23
{
struct NC {
char *begin() const;
@@ -88,10 +149,16 @@ constexpr bool testReturnTypes() {
static_assert(!std::is_invocable_v<RangeDataT, NC&&>);
ASSERT_SAME_TYPE(decltype(std::ranges::data(std::declval<const NC&>())), char*);
static_assert(!std::is_invocable_v<RangeDataT, const NC&&>);
- ASSERT_SAME_TYPE(decltype(std::ranges::cdata(std::declval<NC&>())), char*);
+
static_assert(!std::is_invocable_v<RangeCDataT, NC&&>);
- ASSERT_SAME_TYPE(decltype(std::ranges::cdata(std::declval<const NC&>())), char*);
static_assert(!std::is_invocable_v<RangeCDataT, const NC&&>);
+#if TEST_STD_VER < 23
+ ASSERT_SAME_TYPE(decltype(std::ranges::cdata(std::declval<NC&>())), char*);
+ ASSERT_SAME_TYPE(decltype(std::ranges::cdata(std::declval<const NC&>())), char*);
+#else
+ ASSERT_SAME_TYPE(decltype(std::ranges::cdata(std::declval<NC&>())), const int*);
+ ASSERT_SAME_TYPE(decltype(std::ranges::cdata(std::declval<const NC&>())), const char*);
+#endif
}
return true;
}
@@ -121,10 +188,14 @@ static_assert(!std::is_invocable_v<RangeCDataT, PtrConvertibleDataMember const&>
struct NonConstDataMember {
int x;
constexpr int *data() { return &x; }
+ int* begin();
+ int* end();
};
struct EnabledBorrowingDataMember {
constexpr int *data() { return &globalBuff[0]; }
+ int* begin();
+ int* end();
};
template<>
inline constexpr bool std::ranges::enable_borrowed_range<EnabledBorrowingDataMember> = true;
@@ -133,6 +204,7 @@ struct DataMemberAndBegin {
int x;
constexpr const int *data() const { return &x; }
const int *begin() const;
+ const int* end() const;
};
constexpr bool testDataMember() {
@@ -142,15 +214,13 @@ constexpr bool testDataMember() {
NonConstDataMember b;
assert(std::ranges::data(b) == &b.x);
- static_assert(!std::is_invocable_v<RangeCDataT, decltype((b))>);
+ STD_VER_20(static_assert(!std::is_invocable_v<RangeCDataT, decltype((b))>));
+ STD_VER_23(assert(std::ranges::cdata(b) == &b.x));
EnabledBorrowingDataMember c;
assert(std::ranges::data(std::move(c)) == &globalBuff[0]);
- static_assert(!std::is_invocable_v<RangeCDataT, decltype(std::move(c))>);
-
- DataMemberAndBegin d;
- assert(std::ranges::data(d) == &d.x);
- assert(std::ranges::cdata(d) == &d.x);
+ STD_VER_20(static_assert(!std::is_invocable_v<RangeCDataT, decltype((c))>));
+ STD_VER_23(assert(std::ranges::data(c) == &globalBuff[0]));
return true;
}
@@ -161,6 +231,7 @@ struct BeginMemberContiguousIterator {
int buff[8];
constexpr ContiguousIter begin() const { return ContiguousIter(buff); }
+ constexpr ContiguousIter end() const { return ContiguousIter(buff); }
};
static_assert( std::is_invocable_v<RangeDataT, BeginMemberContiguousIterator &>);
static_assert(!std::is_invocable_v<RangeDataT, BeginMemberContiguousIterator &&>);
@@ -175,6 +246,7 @@ struct BeginMemberRandomAccess {
int buff[8];
random_access_iterator<const int*> begin() const;
+ random_access_iterator<const int*> end() const;
};
static_assert(!std::is_invocable_v<RangeDataT, BeginMemberRandomAccess&>);
static_assert(!std::is_invocable_v<RangeDataT, BeginMemberRandomAccess&&>);
@@ -191,6 +263,7 @@ struct BeginFriendContiguousIterator {
friend constexpr ContiguousIter begin(const BeginFriendContiguousIterator &iter) {
return ContiguousIter(iter.buff);
}
+ friend constexpr ContiguousIter end(const BeginFriendContiguousIterator& iter) { return ContiguousIter(iter.buff); }
};
static_assert( std::is_invocable_v<RangeDataT, BeginMemberContiguousIterator &>);
static_assert(!std::is_invocable_v<RangeDataT, BeginMemberContiguousIterator &&>);
@@ -202,7 +275,8 @@ static_assert( std::is_invocable_v<RangeCDataT, BeginMemberContiguousIterator co
static_assert(!std::is_invocable_v<RangeCDataT, BeginMemberContiguousIterator const&&>);
struct BeginFriendRandomAccess {
- friend random_access_iterator<const int*> begin(const BeginFriendRandomAccess iter);
+ friend random_access_iterator<const int*> begin(const BeginFriendRandomAccess& iter);
+ friend random_access_iterator<const int*> end(const BeginFriendRandomAccess& iter);
};
static_assert(!std::is_invocable_v<RangeDataT, BeginFriendRandomAccess&>);
static_assert(!std::is_invocable_v<RangeDataT, BeginFriendRandomAccess&&>);
@@ -217,6 +291,7 @@ struct BeginMemberRvalue {
int buff[8];
ContiguousIter begin() &&;
+ ContiguousIter end() &&;
};
static_assert(!std::is_invocable_v<RangeDataT, BeginMemberRvalue&>);
static_assert(!std::is_invocable_v<RangeDataT, BeginMemberRvalue&&>);
@@ -229,6 +304,7 @@ static_assert(!std::is_invocable_v<RangeCDataT, BeginMemberRvalue const&&>);
struct BeginMemberBorrowingEnabled {
constexpr contiguous_iterator<int*> begin() { return contiguous_iterator<int*>{&globalBuff[1]}; }
+ constexpr contiguous_iterator<int*> end() { return contiguous_iterator<int*>{&globalBuff[2]}; }
};
template<>
inline constexpr bool std::ranges::enable_borrowed_range<BeginMemberBorrowingEnabled> = true;
@@ -236,11 +312,28 @@ static_assert( std::is_invocable_v<RangeDataT, BeginMemberBorrowingEnabled &>);
static_assert( std::is_invocable_v<RangeDataT, BeginMemberBorrowingEnabled &&>);
static_assert(!std::is_invocable_v<RangeDataT, BeginMemberBorrowingEnabled const&>);
static_assert(!std::is_invocable_v<RangeDataT, BeginMemberBorrowingEnabled const&&>);
-static_assert(!std::is_invocable_v<RangeCDataT, BeginMemberBorrowingEnabled &>);
-static_assert(!std::is_invocable_v<RangeCDataT, BeginMemberBorrowingEnabled &&>);
+STD_VER_20(static_assert(!std::is_invocable_v<RangeCDataT, BeginMemberBorrowingEnabled&>));
+STD_VER_23(static_assert(std::is_invocable_v<RangeCDataT, BeginMemberBorrowingEnabled&>));
+STD_VER_20(static_assert(!std::is_invocable_v<RangeCDataT, BeginMemberBorrowingEnabled&&>));
+STD_VER_23(static_assert(std::is_invocable_v<RangeCDataT, BeginMemberBorrowingEnabled&&>));
static_assert(!std::is_invocable_v<RangeCDataT, BeginMemberBorrowingEnabled const&>);
static_assert(!std::is_invocable_v<RangeCDataT, BeginMemberBorrowingEnabled const&&>);
+struct ConstBeginMemberBorrowingEnabled {
+ constexpr contiguous_iterator<int*> begin() const { return contiguous_iterator<int*>{&globalBuff[1]}; }
+ constexpr contiguous_iterator<int*> end() const { return contiguous_iterator<int*>{&globalBuff[2]}; }
+};
+template <>
+inline constexpr bool std::ranges::enable_borrowed_range<ConstBeginMemberBorrowingEnabled> = true;
+static_assert(std::is_invocable_v<RangeDataT, ConstBeginMemberBorrowingEnabled&>);
+static_assert(std::is_invocable_v<RangeDataT, ConstBeginMemberBorrowingEnabled&&>);
+static_assert(std::is_invocable_v<RangeDataT, ConstBeginMemberBorrowingEnabled const&>);
+static_assert(std::is_invocable_v<RangeDataT, ConstBeginMemberBorrowingEnabled const&&>);
+static_assert(std::is_invocable_v<RangeCDataT, ConstBeginMemberBorrowingEnabled&>);
+static_assert(std::is_invocable_v<RangeCDataT, ConstBeginMemberBorrowingEnabled&&>);
+static_assert(std::is_invocable_v<RangeCDataT, ConstBeginMemberBorrowingEnabled const&>);
+static_assert(std::is_invocable_v<RangeCDataT, ConstBeginMemberBorrowingEnabled const&&>);
+
constexpr bool testViaRangesBegin() {
int arr[2];
assert(std::ranges::data(arr) == arr + 0);
@@ -256,7 +349,12 @@ constexpr bool testViaRangesBegin() {
BeginMemberBorrowingEnabled c;
assert(std::ranges::data(std::move(c)) == &globalBuff[1]);
- static_assert(!std::is_invocable_v<RangeCDataT, decltype(std::move(c))>);
+ STD_VER_20(static_assert(!std::is_invocable_v<RangeCDataT, decltype(std::move(c))>));
+ STD_VER_23(static_assert(std::is_invocable_v<RangeCDataT, decltype(std::move(c))>));
+
+ ConstBeginMemberBorrowingEnabled d;
+ assert(std::ranges::data(std::move(d)) == &globalBuff[1]);
+ assert(std::ranges::cdata(std::move(d)) == &globalBuff[1]);
return true;
}
diff --git a/libcxx/test/std/ranges/range.access/end.pass.cpp b/libcxx/test/std/ranges/range.access/end.pass.cpp
index 3e465b357e9851..3197634c2d97f0 100644
--- a/libcxx/test/std/ranges/range.access/end.pass.cpp
+++ b/libcxx/test/std/ranges/range.access/end.pass.cpp
@@ -9,7 +9,7 @@
// UNSUPPORTED: c++03, c++11, c++14, c++17
// std::ranges::end
-// std::ranges::cend
+// std::ranges::cend // until C++23
#include <ranges>
@@ -19,7 +19,9 @@
#include "test_iterators.h"
using RangeEndT = decltype(std::ranges::end);
+#if TEST_STD_VER < 23
using RangeCEndT = decltype(std::ranges::cend);
+#endif // TEST_STD_VER < 23
static int globalBuff[8];
@@ -27,16 +29,20 @@ static_assert(!std::is_invocable_v<RangeEndT, int (&&)[]>);
static_assert(!std::is_invocable_v<RangeEndT, int (&)[]>);
static_assert(!std::is_invocable_v<RangeEndT, int (&&)[10]>);
static_assert( std::is_invocable_v<RangeEndT, int (&)[10]>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCEndT, int (&&)[]>);
static_assert(!std::is_invocable_v<RangeCEndT, int (&)[]>);
static_assert(!std::is_invocable_v<RangeCEndT, int (&&)[10]>);
static_assert( std::is_invocable_v<RangeCEndT, int (&)[10]>);
+#endif // TEST_STD_VER < 23
struct Incomplete;
static_assert(!std::is_invocable_v<RangeEndT, Incomplete(&&)[]>);
static_assert(!std::is_invocable_v<RangeEndT, Incomplete(&&)[42]>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCEndT, Incomplete(&&)[]>);
static_assert(!std::is_invocable_v<RangeCEndT, Incomplete(&&)[42]>);
+#endif // TEST_STD_VER < 23
struct EndMember {
int x;
@@ -49,47 +55,50 @@ static_assert( std::is_invocable_v<RangeEndT, EndMember &>);
static_assert(!std::is_invocable_v<RangeEndT, EndMember &&>);
static_assert( std::is_invocable_v<RangeEndT, EndMember const&>);
static_assert(!std::is_invocable_v<RangeEndT, EndMember const&&>);
+#if TEST_STD_VER < 23
static_assert( std::is_invocable_v<RangeCEndT, EndMember &>);
static_assert(!std::is_invocable_v<RangeCEndT, EndMember &&>);
static_assert( std::is_invocable_v<RangeCEndT, EndMember const&>);
static_assert(!std::is_invocable_v<RangeCEndT, EndMember const&&>);
+#endif // TEST_STD_VER < 23
constexpr bool testReturnTypes() {
- {
- int *x[2];
- ASSERT_SAME_TYPE(decltype(std::ranges::end(x)), int**);
- ASSERT_SAME_TYPE(decltype(std::ranges::cend(x)), int* const*);
- }
- {
- int x[2][2];
- ASSERT_SAME_TYPE(decltype(std::ranges::end(x)), int(*)[2]);
- ASSERT_SAME_TYPE(decltype(std::ranges::cend(x)), const int(*)[2]);
- }
- {
- struct Different {
- char *begin();
- sentinel_wrapper<char*>& end();
- short *begin() const;
- sentinel_wrapper<short*>& end() const;
- } x;
- ASSERT_SAME_TYPE(decltype(std::ranges::end(x)), sentinel_wrapper<char*>);
- ASSERT_SAME_TYPE(decltype(std::ranges::cend(x)), sentinel_wrapper<short*>);
- }
+ int* a[2];
+ int b[2][2];
+ struct Different {
+ char* begin();
+ sentinel_wrapper<char*>& end();
+ short* begin() const;
+ sentinel_wrapper<short*>& end() const;
+ } c;
+
+ ASSERT_SAME_TYPE(decltype(std::ranges::end(a)), int**);
+ ASSERT_SAME_TYPE(decltype(std::ranges::end(b)), int(*)[2]);
+ ASSERT_SAME_TYPE(decltype(std::ranges::end(c)), sentinel_wrapper<char*>);
+
+#if TEST_STD_VER < 23
+ ASSERT_SAME_TYPE(decltype(std::ranges::cend(a)), int* const*);
+ ASSERT_SAME_TYPE(decltype(std::ranges::cend(b)), const int(*)[2]);
+ ASSERT_SAME_TYPE(decltype(std::ranges::cend(c)), sentinel_wrapper<short*>);
+#endif // TEST_STD_VER < 23
+
return true;
}
constexpr bool testArray() {
int a[2];
- assert(std::ranges::end(a) == a + 2);
- assert(std::ranges::cend(a) == a + 2);
-
int b[2][2];
- assert(std::ranges::end(b) == b + 2);
- assert(std::ranges::cend(b) == b + 2);
-
EndMember c[2];
+
+ assert(std::ranges::end(a) == a + 2);
+ assert(std::ranges::end(b) == b + 2);
assert(std::ranges::end(c) == c + 2);
+
+#if TEST_STD_VER < 23
+ assert(std::ranges::cend(a) == a + 2);
+ assert(std::ranges::cend(b) == b + 2);
assert(std::ranges::cend(c) == c + 2);
+#endif // TEST_STD_VER < 23
return true;
}
@@ -127,8 +136,10 @@ struct NonConstEndMember {
};
static_assert( std::is_invocable_v<RangeEndT, NonConstEndMember &>);
static_assert(!std::is_invocable_v<RangeEndT, NonConstEndMember const&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCEndT, NonConstEndMember &>);
static_assert(!std::is_invocable_v<RangeCEndT, NonConstEndMember const&>);
+#endif // TEST_STD_VER < 23
struct EnabledBorrowingEndMember {
constexpr int *begin() const { return nullptr; }
@@ -160,24 +171,24 @@ struct EmptyPtrEndMember {
constexpr bool testEndMember() {
EndMember a;
- assert(std::ranges::end(a) == &a.x);
- assert(std::ranges::cend(a) == &a.x);
-
NonConstEndMember b;
- assert(std::ranges::end(b) == &b.x);
- static_assert(!std::is_invocable_v<RangeCEndT, decltype((b))>);
-
EnabledBorrowingEndMember c;
- assert(std::ranges::end(std::move(c)) == &globalBuff[0]);
- assert(std::ranges::cend(std::move(c)) == &globalBuff[0]);
-
EndMemberFunction d;
- assert(std::ranges::end(d) == &d.x);
- assert(std::ranges::cend(d) == &d.x);
-
EmptyPtrEndMember e;
+
+ assert(std::ranges::end(a) == &a.x);
+ assert(std::ranges::end(b) == &b.x);
+ assert(std::ranges::end(std::move(c)) == &globalBuff[0]);
+ assert(std::ranges::end(d) == &d.x);
assert(std::ranges::end(e) == &e.x);
+
+#if TEST_STD_VER < 23
+ assert(std::ranges::cend(a) == &a.x);
+ static_assert(!std::is_invocable_v<RangeCEndT, decltype((b))>);
+ assert(std::ranges::cend(std::move(c)) == &globalBuff[0]);
+ assert(std::ranges::cend(d) == &d.x);
assert(std::ranges::cend(e) == &e.x);
+#endif // TEST_STD_VER < 23
return true;
}
@@ -194,8 +205,10 @@ static_assert(!std::is_invocable_v<RangeEndT, EndFunction &&>);
static_assert( std::is_invocable_v<RangeEndT, EndFunction const&>);
static_assert(!std::is_invocable_v<RangeEndT, EndFunction &&>);
static_assert(std::is_invocable_v<RangeEndT, EndFunction&>); // Ill-formed before P2602R2 Poison Pills are Too Toxic
+#if TEST_STD_VER < 23
static_assert( std::is_invocable_v<RangeCEndT, EndFunction const&>);
static_assert( std::is_invocable_v<RangeCEndT, EndFunction &>);
+#endif // TEST_STD_VER < 23
struct EndFunctionReturnsInt {
friend constexpr int begin(EndFunctionReturnsInt const&);
@@ -230,7 +243,9 @@ struct EndFunctionByValue {
friend constexpr int *begin(EndFunctionByValue) { return nullptr; }
friend constexpr int *end(EndFunctionByValue) { return &globalBuff[1]; }
};
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCEndT, EndFunctionByValue>);
+#endif // TEST_STD_VER < 23
struct EndFunctionEnabledBorrowing {
friend constexpr int *begin(EndFunctionEnabledBorrowing) { return nullptr; }
@@ -268,61 +283,63 @@ struct BeginMemberEndFunction {
constexpr bool testEndFunction() {
const EndFunction a{};
- assert(std::ranges::end(a) == &a.x);
- assert(std::ranges::cend(a) == &a.x);
EndFunction aa{};
- assert(std::ranges::end(aa) == &aa.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
- assert(std::ranges::cend(aa) == &aa.x);
-
EndFunctionByValue b;
- assert(std::ranges::end(b) == &globalBuff[1]);
- assert(std::ranges::cend(b) == &globalBuff[1]);
-
EndFunctionEnabledBorrowing c;
- assert(std::ranges::end(std::move(c)) == &globalBuff[2]);
- assert(std::ranges::cend(std::move(c)) == &globalBuff[2]);
-
const EndFunctionReturnsEmptyPtr d{};
- assert(std::ranges::end(d) == &d.x);
- assert(std::ranges::cend(d) == &d.x);
EndFunctionReturnsEmptyPtr dd{};
- assert(std::ranges::end(dd) == &dd.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
- assert(std::ranges::cend(dd) == &dd.x);
-
const EndFunctionWithDataMember e{};
- assert(std::ranges::end(e) == &e.x);
- assert(std::ranges::cend(e) == &e.x);
EndFunctionWithDataMember ee{};
- assert(std::ranges::end(ee) == &ee.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
- assert(std::ranges::cend(ee) == &ee.x);
-
const EndFunctionWithPrivateEndMember f{};
- assert(std::ranges::end(f) == &f.y);
- assert(std::ranges::cend(f) == &f.y);
EndFunctionWithPrivateEndMember ff{};
- assert(std::ranges::end(ff) == &ff.y); // Ill-formed before P2602R2 Poison Pills are Too Toxic
- assert(std::ranges::cend(ff) == &ff.y);
-
const BeginMemberEndFunction g{};
- assert(std::ranges::end(g) == &g.x);
- assert(std::ranges::cend(g) == &g.x);
BeginMemberEndFunction gg{};
+
+ assert(std::ranges::end(a) == &a.x);
+ assert(std::ranges::end(aa) == &aa.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
+ assert(std::ranges::end(b) == &globalBuff[1]);
+ assert(std::ranges::end(std::move(c)) == &globalBuff[2]);
+ assert(std::ranges::end(d) == &d.x);
+ assert(std::ranges::end(dd) == &dd.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
+ assert(std::ranges::end(e) == &e.x);
+ assert(std::ranges::end(ee) == &ee.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
+ assert(std::ranges::end(f) == &f.y);
+ assert(std::ranges::end(ff) == &ff.y); // Ill-formed before P2602R2 Poison Pills are Too Toxic
+ assert(std::ranges::end(g) == &g.x);
assert(std::ranges::end(gg) == &gg.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
+
+#if TEST_STD_VER < 23
+ assert(std::ranges::cend(a) == &a.x);
+ assert(std::ranges::cend(aa) == &aa.x);
+ assert(std::ranges::cend(b) == &globalBuff[1]);
+ assert(std::ranges::cend(std::move(c)) == &globalBuff[2]);
+ assert(std::ranges::cend(d) == &d.x);
+ assert(std::ranges::cend(dd) == &dd.x);
+ assert(std::ranges::cend(e) == &e.x);
+ assert(std::ranges::cend(ee) == &ee.x);
+ assert(std::ranges::cend(f) == &f.y);
+ assert(std::ranges::cend(ff) == &ff.y);
+ assert(std::ranges::cend(g) == &g.x);
assert(std::ranges::cend(gg) == &gg.x);
+#endif // TEST_STD_VER < 23
return true;
}
ASSERT_NOEXCEPT(std::ranges::end(std::declval<int (&)[10]>()));
+#if TEST_STD_VER < 23
ASSERT_NOEXCEPT(std::ranges::cend(std::declval<int (&)[10]>()));
+#endif // TEST_STD_VER < 23
struct NoThrowMemberEnd {
ThrowingIterator<int> begin() const;
ThrowingIterator<int> end() const noexcept; // auto(t.end()) doesn't throw
} ntme;
static_assert(noexcept(std::ranges::end(ntme)));
+#if TEST_STD_VER < 23
static_assert(noexcept(std::ranges::cend(ntme)));
+#endif // TEST_STD_VER < 23
struct NoThrowADLEnd {
ThrowingIterator<int> begin() const;
@@ -330,29 +347,37 @@ struct NoThrowADLEnd {
friend ThrowingIterator<int> end(const NoThrowADLEnd&) noexcept;
} ntae;
static_assert(noexcept(std::ranges::end(ntae)));
+#if TEST_STD_VER < 23
static_assert(noexcept(std::ranges::cend(ntae)));
+#endif // TEST_STD_VER < 23
struct NoThrowMemberEndReturnsRef {
ThrowingIterator<int> begin() const;
ThrowingIterator<int>& end() const noexcept; // auto(t.end()) may throw
} ntmerr;
static_assert(!noexcept(std::ranges::end(ntmerr)));
+#if TEST_STD_VER < 23
static_assert(!noexcept(std::ranges::cend(ntmerr)));
+#endif // TEST_STD_VER < 23
struct EndReturnsArrayRef {
auto begin() const noexcept -> int(&)[10];
auto end() const noexcept -> int(&)[10];
} erar;
static_assert(noexcept(std::ranges::end(erar)));
+#if TEST_STD_VER < 23
static_assert(noexcept(std::ranges::cend(erar)));
+#endif // TEST_STD_VER < 23
// Test ADL-proofing.
struct Incomplete;
template<class T> struct Holder { T t; };
static_assert(!std::is_invocable_v<RangeEndT, Holder<Incomplete>*>);
static_assert(!std::is_invocable_v<RangeEndT, Holder<Incomplete>*&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCEndT, Holder<Incomplete>*>);
static_assert(!std::is_invocable_v<RangeCEndT, Holder<Incomplete>*&>);
+#endif // TEST_STD_VER < 23
int main(int, char**) {
static_assert(testReturnTypes());
diff --git a/libcxx/test/std/ranges/range.access/rbegin.pass.cpp b/libcxx/test/std/ranges/range.access/rbegin.pass.cpp
index 3997f38efd0298..7919b84d2b35a0 100644
--- a/libcxx/test/std/ranges/range.access/rbegin.pass.cpp
+++ b/libcxx/test/std/ranges/range.access/rbegin.pass.cpp
@@ -9,7 +9,7 @@
// UNSUPPORTED: c++03, c++11, c++14, c++17
// std::ranges::rbegin
-// std::ranges::crbegin
+// std::ranges::crbegin // until C++23
#include <ranges>
@@ -19,7 +19,9 @@
#include "test_iterators.h"
using RangeRBeginT = decltype(std::ranges::rbegin);
+#if TEST_STD_VER < 23
using RangeCRBeginT = decltype(std::ranges::crbegin);
+#endif // TEST_STD_VER < 23
static int globalBuff[8];
@@ -27,34 +29,42 @@ static_assert(!std::is_invocable_v<RangeRBeginT, int (&&)[10]>);
static_assert( std::is_invocable_v<RangeRBeginT, int (&)[10]>);
static_assert(!std::is_invocable_v<RangeRBeginT, int (&&)[]>);
static_assert(!std::is_invocable_v<RangeRBeginT, int (&)[]>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCRBeginT, int (&&)[10]>);
static_assert( std::is_invocable_v<RangeCRBeginT, int (&)[10]>);
static_assert(!std::is_invocable_v<RangeCRBeginT, int (&&)[]>);
static_assert(!std::is_invocable_v<RangeCRBeginT, int (&)[]>);
+#endif // TEST_STD_VER < 23
struct Incomplete;
static_assert(!std::is_invocable_v<RangeRBeginT, Incomplete(&&)[]>);
-static_assert(!std::is_invocable_v<RangeRBeginT, const Incomplete(&&)[]>);
-static_assert(!std::is_invocable_v<RangeCRBeginT, Incomplete(&&)[]>);
-static_assert(!std::is_invocable_v<RangeCRBeginT, const Incomplete(&&)[]>);
-
+static_assert(!std::is_invocable_v<RangeRBeginT, const Incomplete (&&)[]>);
static_assert(!std::is_invocable_v<RangeRBeginT, Incomplete(&&)[10]>);
static_assert(!std::is_invocable_v<RangeRBeginT, const Incomplete(&&)[10]>);
+
+#if TEST_STD_VER < 23
+static_assert(!std::is_invocable_v<RangeCRBeginT, Incomplete (&&)[]>);
+static_assert(!std::is_invocable_v<RangeCRBeginT, const Incomplete (&&)[]>);
static_assert(!std::is_invocable_v<RangeCRBeginT, Incomplete(&&)[10]>);
static_assert(!std::is_invocable_v<RangeCRBeginT, const Incomplete(&&)[10]>);
+#endif // TEST_STD_VER < 23
// This case is IFNDR; we handle it SFINAE-friendly.
LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeRBeginT, Incomplete(&)[]>);
LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeRBeginT, const Incomplete(&)[]>);
+#if TEST_STD_VER < 23
LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCRBeginT, Incomplete(&)[]>);
LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCRBeginT, const Incomplete(&)[]>);
+#endif // TEST_STD_VER < 23
// This case is IFNDR; we handle it SFINAE-friendly.
LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeRBeginT, Incomplete(&)[10]>);
LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeRBeginT, const Incomplete(&)[10]>);
+#if TEST_STD_VER < 23
LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCRBeginT, Incomplete(&)[10]>);
LIBCPP_STATIC_ASSERT(!std::is_invocable_v<RangeCRBeginT, const Incomplete(&)[10]>);
+#endif // TEST_STD_VER < 23
struct RBeginMember {
int x;
@@ -66,45 +76,48 @@ static_assert( std::is_invocable_v<RangeRBeginT, RBeginMember &>);
static_assert(!std::is_invocable_v<RangeRBeginT, RBeginMember &&>);
static_assert( std::is_invocable_v<RangeRBeginT, RBeginMember const&>);
static_assert(!std::is_invocable_v<RangeRBeginT, RBeginMember const&&>);
+#if TEST_STD_VER < 23
static_assert( std::is_invocable_v<RangeCRBeginT, RBeginMember &>);
static_assert(!std::is_invocable_v<RangeCRBeginT, RBeginMember &&>);
static_assert( std::is_invocable_v<RangeCRBeginT, RBeginMember const&>);
static_assert(!std::is_invocable_v<RangeCRBeginT, RBeginMember const&&>);
+#endif // TEST_STD_VER < 23
constexpr bool testReturnTypes() {
- {
- int *x[2];
- ASSERT_SAME_TYPE(decltype(std::ranges::rbegin(x)), std::reverse_iterator<int**>);
- ASSERT_SAME_TYPE(decltype(std::ranges::crbegin(x)), std::reverse_iterator<int* const*>);
- }
- {
- int x[2][2];
- ASSERT_SAME_TYPE(decltype(std::ranges::rbegin(x)), std::reverse_iterator<int(*)[2]>);
- ASSERT_SAME_TYPE(decltype(std::ranges::crbegin(x)), std::reverse_iterator<const int(*)[2]>);
- }
- {
- struct Different {
- char*& rbegin();
- short*& rbegin() const;
- } x;
- ASSERT_SAME_TYPE(decltype(std::ranges::rbegin(x)), char*);
- ASSERT_SAME_TYPE(decltype(std::ranges::crbegin(x)), short*);
- }
+ int* a[2];
+ int b[2][2];
+ struct Different {
+ char*& rbegin();
+ short*& rbegin() const;
+ } c;
+
+ ASSERT_SAME_TYPE(decltype(std::ranges::rbegin(a)), std::reverse_iterator<int**>);
+ ASSERT_SAME_TYPE(decltype(std::ranges::rbegin(b)), std::reverse_iterator<int(*)[2]>);
+ ASSERT_SAME_TYPE(decltype(std::ranges::rbegin(c)), char*);
+
+#if TEST_STD_VER < 23
+ ASSERT_SAME_TYPE(decltype(std::ranges::crbegin(a)), std::reverse_iterator<int* const*>);
+ ASSERT_SAME_TYPE(decltype(std::ranges::crbegin(b)), std::reverse_iterator<const int(*)[2]>);
+ ASSERT_SAME_TYPE(decltype(std::ranges::crbegin(c)), short*);
+#endif // TEST_STD_VER < 23
+
return true;
}
constexpr bool testArray() {
int a[2];
- assert(std::ranges::rbegin(a).base() == a + 2);
- assert(std::ranges::crbegin(a).base() == a + 2);
-
int b[2][2];
- assert(std::ranges::rbegin(b).base() == b + 2);
- assert(std::ranges::crbegin(b).base() == b + 2);
-
RBeginMember c[2];
+
+ assert(std::ranges::rbegin(a).base() == a + 2);
+ assert(std::ranges::rbegin(b).base() == b + 2);
assert(std::ranges::rbegin(c).base() == c + 2);
+
+#if TEST_STD_VER < 23
+ assert(std::ranges::crbegin(a).base() == a + 2);
+ assert(std::ranges::crbegin(b).base() == b + 2);
assert(std::ranges::crbegin(c).base() == c + 2);
+#endif // TEST_STD_VER < 23
return true;
}
@@ -131,8 +144,10 @@ struct NonConstRBeginMember {
};
static_assert( std::is_invocable_v<RangeRBeginT, NonConstRBeginMember &>);
static_assert(!std::is_invocable_v<RangeRBeginT, NonConstRBeginMember const&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCRBeginT, NonConstRBeginMember &>);
static_assert(!std::is_invocable_v<RangeCRBeginT, NonConstRBeginMember const&>);
+#endif // TEST_STD_VER < 23
struct EnabledBorrowingRBeginMember {
constexpr int *rbegin() const { return globalBuff; }
@@ -154,28 +169,28 @@ struct EmptyPtrRBeginMember {
constexpr bool testRBeginMember() {
RBeginMember a;
+ NonConstRBeginMember b;
+ EnabledBorrowingRBeginMember c;
+ RBeginMemberFunction d;
+ EmptyPtrRBeginMember e;
+
assert(std::ranges::rbegin(a) == &a.x);
- assert(std::ranges::crbegin(a) == &a.x);
static_assert(!std::is_invocable_v<RangeRBeginT, RBeginMember&&>);
- static_assert(!std::is_invocable_v<RangeCRBeginT, RBeginMember&&>);
-
- NonConstRBeginMember b;
assert(std::ranges::rbegin(b) == &b.x);
- static_assert(!std::is_invocable_v<RangeCRBeginT, NonConstRBeginMember&>);
-
- EnabledBorrowingRBeginMember c;
assert(std::ranges::rbegin(c) == globalBuff);
- assert(std::ranges::crbegin(c) == globalBuff);
assert(std::ranges::rbegin(std::move(c)) == globalBuff);
- assert(std::ranges::crbegin(std::move(c)) == globalBuff);
-
- RBeginMemberFunction d;
assert(std::ranges::rbegin(d) == &d.x);
- assert(std::ranges::crbegin(d) == &d.x);
-
- EmptyPtrRBeginMember e;
assert(std::ranges::rbegin(e) == &e.x);
+
+#if TEST_STD_VER < 23
+ assert(std::ranges::crbegin(a) == &a.x);
+ static_assert(!std::is_invocable_v<RangeCRBeginT, RBeginMember&&>);
+ static_assert(!std::is_invocable_v<RangeCRBeginT, NonConstRBeginMember&>);
+ assert(std::ranges::crbegin(c) == globalBuff);
+ assert(std::ranges::crbegin(std::move(c)) == globalBuff);
+ assert(std::ranges::crbegin(d) == &d.x);
assert(std::ranges::crbegin(e) == &e.x);
+#endif // TEST_STD_VER < 23
return true;
}
@@ -189,8 +204,10 @@ static_assert( std::is_invocable_v<RangeRBeginT, RBeginFunction const&>);
static_assert(!std::is_invocable_v<RangeRBeginT, RBeginFunction &&>);
static_assert(
std::is_invocable_v<RangeRBeginT, RBeginFunction&>); // Ill-formed before P2602R2 Poison Pills are Too Toxic
+#if TEST_STD_VER < 23
static_assert( std::is_invocable_v<RangeCRBeginT, RBeginFunction const&>);
static_assert( std::is_invocable_v<RangeCRBeginT, RBeginFunction &>);
+#endif // TEST_STD_VER < 23
struct RBeginFunctionReturnsInt {
friend int rbegin(RBeginFunctionReturnsInt const&);
@@ -217,7 +234,9 @@ static_assert(!std::is_invocable_v<RangeRBeginT, RBeginFunctionReturnsPtrConvert
struct RBeginFunctionByValue {
friend constexpr int *rbegin(RBeginFunctionByValue) { return globalBuff + 1; }
};
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCRBeginT, RBeginFunctionByValue>);
+#endif // TEST_STD_VER < 23
struct RBeginFunctionEnabledBorrowing {
friend constexpr int *rbegin(RBeginFunctionEnabledBorrowing) { return globalBuff + 2; }
@@ -247,45 +266,44 @@ struct RBeginFunctionWithPrivateBeginMember {
constexpr bool testRBeginFunction() {
RBeginFunction a{};
const RBeginFunction aa{};
- assert(std::ranges::rbegin(a) == &a.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
- assert(std::ranges::crbegin(a) == &a.x);
- assert(std::ranges::rbegin(aa) == &aa.x);
- assert(std::ranges::crbegin(aa) == &aa.x);
-
RBeginFunctionByValue b{};
const RBeginFunctionByValue bb{};
- assert(std::ranges::rbegin(b) == globalBuff + 1);
- assert(std::ranges::crbegin(b) == globalBuff + 1);
- assert(std::ranges::rbegin(bb) == globalBuff + 1);
- assert(std::ranges::crbegin(bb) == globalBuff + 1);
-
RBeginFunctionEnabledBorrowing c{};
const RBeginFunctionEnabledBorrowing cc{};
- assert(std::ranges::rbegin(std::move(c)) == globalBuff + 2);
- assert(std::ranges::crbegin(std::move(c)) == globalBuff + 2);
- assert(std::ranges::rbegin(std::move(cc)) == globalBuff + 2);
- assert(std::ranges::crbegin(std::move(cc)) == globalBuff + 2);
-
RBeginFunctionReturnsEmptyPtr d{};
const RBeginFunctionReturnsEmptyPtr dd{};
- assert(std::ranges::rbegin(d) == &d.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
- assert(std::ranges::crbegin(d) == &d.x);
- assert(std::ranges::rbegin(dd) == &dd.x);
- assert(std::ranges::crbegin(dd) == &dd.x);
-
RBeginFunctionWithDataMember e{};
const RBeginFunctionWithDataMember ee{};
+ RBeginFunctionWithPrivateBeginMember f{};
+ const RBeginFunctionWithPrivateBeginMember ff{};
+
+ assert(std::ranges::rbegin(a) == &a.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
+ assert(std::ranges::rbegin(aa) == &aa.x);
+ assert(std::ranges::rbegin(b) == globalBuff + 1);
+ assert(std::ranges::rbegin(bb) == globalBuff + 1);
+ assert(std::ranges::rbegin(std::move(c)) == globalBuff + 2);
+ assert(std::ranges::rbegin(std::move(cc)) == globalBuff + 2);
+ assert(std::ranges::rbegin(d) == &d.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
+ assert(std::ranges::rbegin(dd) == &dd.x);
assert(std::ranges::rbegin(e) == &e.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
assert(std::ranges::rbegin(ee) == &ee.x);
+ assert(std::ranges::rbegin(f) == &f.y); // Ill-formed before P2602R2 Poison Pills are Too Toxic
+ assert(std::ranges::rbegin(ff) == &ff.y);
+
+#if TEST_STD_VER < 23
+ assert(std::ranges::crbegin(a) == &a.x);
+ assert(std::ranges::crbegin(aa) == &aa.x);
+ assert(std::ranges::crbegin(b) == globalBuff + 1);
+ assert(std::ranges::crbegin(bb) == globalBuff + 1);
+ assert(std::ranges::crbegin(std::move(c)) == globalBuff + 2);
+ assert(std::ranges::crbegin(std::move(cc)) == globalBuff + 2);
+ assert(std::ranges::crbegin(d) == &d.x);
+ assert(std::ranges::crbegin(dd) == &dd.x);
assert(std::ranges::crbegin(e) == &e.x);
assert(std::ranges::crbegin(ee) == &ee.x);
-
- RBeginFunctionWithPrivateBeginMember f{};
- const RBeginFunctionWithPrivateBeginMember ff{};
- assert(std::ranges::rbegin(f) == &f.y); // Ill-formed before P2602R2 Poison Pills are Too Toxic
assert(std::ranges::crbegin(f) == &f.y);
- assert(std::ranges::rbegin(ff) == &ff.y);
assert(std::ranges::crbegin(ff) == &ff.y);
+#endif // TEST_STD_VER < 23
return true;
}
@@ -301,7 +319,9 @@ struct MemberBeginEnd {
};
static_assert( std::is_invocable_v<RangeRBeginT, MemberBeginEnd&>);
static_assert( std::is_invocable_v<RangeRBeginT, MemberBeginEnd const&>);
+#if TEST_STD_VER < 23
static_assert( std::is_invocable_v<RangeCRBeginT, MemberBeginEnd const&>);
+#endif // TEST_STD_VER < 23
struct FunctionBeginEnd {
int b, e;
@@ -319,7 +339,9 @@ struct FunctionBeginEnd {
};
static_assert( std::is_invocable_v<RangeRBeginT, FunctionBeginEnd&>);
static_assert( std::is_invocable_v<RangeRBeginT, FunctionBeginEnd const&>);
+#if TEST_STD_VER < 23
static_assert( std::is_invocable_v<RangeCRBeginT, FunctionBeginEnd const&>);
+#endif // TEST_STD_VER < 23
struct MemberBeginFunctionEnd {
int b, e;
@@ -335,7 +357,9 @@ struct MemberBeginFunctionEnd {
};
static_assert( std::is_invocable_v<RangeRBeginT, MemberBeginFunctionEnd&>);
static_assert( std::is_invocable_v<RangeRBeginT, MemberBeginFunctionEnd const&>);
+#if TEST_STD_VER < 23
static_assert( std::is_invocable_v<RangeCRBeginT, MemberBeginFunctionEnd const&>);
+#endif // TEST_STD_VER < 23
struct FunctionBeginMemberEnd {
int b, e;
@@ -351,59 +375,77 @@ struct FunctionBeginMemberEnd {
};
static_assert( std::is_invocable_v<RangeRBeginT, FunctionBeginMemberEnd&>);
static_assert( std::is_invocable_v<RangeRBeginT, FunctionBeginMemberEnd const&>);
+#if TEST_STD_VER < 23
static_assert( std::is_invocable_v<RangeCRBeginT, FunctionBeginMemberEnd const&>);
+#endif // TEST_STD_VER < 23
struct MemberBeginEndDifferentTypes {
bidirectional_iterator<int*> begin();
bidirectional_iterator<const int*> end();
};
static_assert(!std::is_invocable_v<RangeRBeginT, MemberBeginEndDifferentTypes&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCRBeginT, MemberBeginEndDifferentTypes&>);
+#endif // TEST_STD_VER < 23
struct FunctionBeginEndDifferentTypes {
friend bidirectional_iterator<int*> begin(FunctionBeginEndDifferentTypes&);
friend bidirectional_iterator<const int*> end(FunctionBeginEndDifferentTypes&);
};
static_assert(!std::is_invocable_v<RangeRBeginT, FunctionBeginEndDifferentTypes&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCRBeginT, FunctionBeginEndDifferentTypes&>);
+#endif // TEST_STD_VER < 23
struct MemberBeginEndForwardIterators {
forward_iterator<int*> begin();
forward_iterator<int*> end();
};
static_assert(!std::is_invocable_v<RangeRBeginT, MemberBeginEndForwardIterators&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCRBeginT, MemberBeginEndForwardIterators&>);
+#endif // TEST_STD_VER < 23
struct FunctionBeginEndForwardIterators {
friend forward_iterator<int*> begin(FunctionBeginEndForwardIterators&);
friend forward_iterator<int*> end(FunctionBeginEndForwardIterators&);
};
static_assert(!std::is_invocable_v<RangeRBeginT, FunctionBeginEndForwardIterators&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCRBeginT, FunctionBeginEndForwardIterators&>);
+#endif // TEST_STD_VER < 23
struct MemberBeginOnly {
bidirectional_iterator<int*> begin() const;
};
static_assert(!std::is_invocable_v<RangeRBeginT, MemberBeginOnly&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCRBeginT, MemberBeginOnly&>);
+#endif // TEST_STD_VER < 23
struct FunctionBeginOnly {
friend bidirectional_iterator<int*> begin(FunctionBeginOnly&);
};
static_assert(!std::is_invocable_v<RangeRBeginT, FunctionBeginOnly&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCRBeginT, FunctionBeginOnly&>);
+#endif // TEST_STD_VER < 23
struct MemberEndOnly {
bidirectional_iterator<int*> end() const;
};
static_assert(!std::is_invocable_v<RangeRBeginT, MemberEndOnly&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCRBeginT, MemberEndOnly&>);
+#endif // TEST_STD_VER < 23
struct FunctionEndOnly {
friend bidirectional_iterator<int*> end(FunctionEndOnly&);
};
static_assert(!std::is_invocable_v<RangeRBeginT, FunctionEndOnly&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCRBeginT, FunctionEndOnly&>);
+#endif // TEST_STD_VER < 23
// Make sure there is no clash between the following cases:
// - the case that handles classes defining member `rbegin` and `rend` functions;
@@ -414,93 +456,112 @@ struct MemberBeginAndRBegin {
int* rbegin() const;
int* rend() const;
};
-static_assert( std::is_invocable_v<RangeRBeginT, MemberBeginAndRBegin&>);
-static_assert( std::is_invocable_v<RangeCRBeginT, MemberBeginAndRBegin&>);
+static_assert(std::is_invocable_v<RangeRBeginT, MemberBeginAndRBegin&>);
static_assert( std::same_as<std::invoke_result_t<RangeRBeginT, MemberBeginAndRBegin&>, int*>);
+#if TEST_STD_VER < 23
+static_assert(std::is_invocable_v<RangeCRBeginT, MemberBeginAndRBegin&>);
static_assert( std::same_as<std::invoke_result_t<RangeCRBeginT, MemberBeginAndRBegin&>, int*>);
+#endif // TEST_STD_VER < 23
constexpr bool testBeginEnd() {
MemberBeginEnd a{};
const MemberBeginEnd aa{};
- assert(base(std::ranges::rbegin(a).base()) == &a.e);
- assert(base(std::ranges::crbegin(a).base()) == &a.ce);
- assert(base(std::ranges::rbegin(aa).base()) == &aa.ce);
- assert(base(std::ranges::crbegin(aa).base()) == &aa.ce);
-
FunctionBeginEnd b{};
const FunctionBeginEnd bb{};
- assert(base(std::ranges::rbegin(b).base()) == &b.e);
- assert(base(std::ranges::crbegin(b).base()) == &b.ce);
- assert(base(std::ranges::rbegin(bb).base()) == &bb.ce);
- assert(base(std::ranges::crbegin(bb).base()) == &bb.ce);
-
MemberBeginFunctionEnd c{};
const MemberBeginFunctionEnd cc{};
- assert(base(std::ranges::rbegin(c).base()) == &c.e);
- assert(base(std::ranges::crbegin(c).base()) == &c.ce);
- assert(base(std::ranges::rbegin(cc).base()) == &cc.ce);
- assert(base(std::ranges::crbegin(cc).base()) == &cc.ce);
-
FunctionBeginMemberEnd d{};
const FunctionBeginMemberEnd dd{};
+
+ assert(base(std::ranges::rbegin(a).base()) == &a.e);
+ assert(base(std::ranges::rbegin(aa).base()) == &aa.ce);
+ assert(base(std::ranges::rbegin(b).base()) == &b.e);
+ assert(base(std::ranges::rbegin(bb).base()) == &bb.ce);
+ assert(base(std::ranges::rbegin(c).base()) == &c.e);
+ assert(base(std::ranges::rbegin(cc).base()) == &cc.ce);
assert(base(std::ranges::rbegin(d).base()) == &d.e);
- assert(base(std::ranges::crbegin(d).base()) == &d.ce);
assert(base(std::ranges::rbegin(dd).base()) == &dd.ce);
+
+#if TEST_STD_VER < 23
+ assert(base(std::ranges::crbegin(a).base()) == &a.ce);
+ assert(base(std::ranges::crbegin(aa).base()) == &aa.ce);
+ assert(base(std::ranges::crbegin(b).base()) == &b.ce);
+ assert(base(std::ranges::crbegin(bb).base()) == &bb.ce);
+ assert(base(std::ranges::crbegin(c).base()) == &c.ce);
+ assert(base(std::ranges::crbegin(cc).base()) == &cc.ce);
+ assert(base(std::ranges::crbegin(d).base()) == &d.ce);
assert(base(std::ranges::crbegin(dd).base()) == &dd.ce);
+#endif // TEST_STD_VER < 23
return true;
}
ASSERT_NOEXCEPT(std::ranges::rbegin(std::declval<int (&)[10]>()));
+#if TEST_STD_VER < 23
ASSERT_NOEXCEPT(std::ranges::crbegin(std::declval<int (&)[10]>()));
+#endif // TEST_STD_VER < 23
struct NoThrowMemberRBegin {
ThrowingIterator<int> rbegin() const noexcept; // auto(t.rbegin()) doesn't throw
} ntmb;
static_assert(noexcept(std::ranges::rbegin(ntmb)));
+#if TEST_STD_VER < 23
static_assert(noexcept(std::ranges::crbegin(ntmb)));
+#endif // TEST_STD_VER < 23
struct NoThrowADLRBegin {
friend ThrowingIterator<int> rbegin(NoThrowADLRBegin&) noexcept; // auto(rbegin(t)) doesn't throw
friend ThrowingIterator<int> rbegin(const NoThrowADLRBegin&) noexcept;
} ntab;
static_assert(noexcept(std::ranges::rbegin(ntab)));
+#if TEST_STD_VER < 23
static_assert(noexcept(std::ranges::crbegin(ntab)));
+#endif // TEST_STD_VER < 23
struct NoThrowMemberRBeginReturnsRef {
ThrowingIterator<int>& rbegin() const noexcept; // auto(t.rbegin()) may throw
} ntmbrr;
static_assert(!noexcept(std::ranges::rbegin(ntmbrr)));
+#if TEST_STD_VER < 23
static_assert(!noexcept(std::ranges::crbegin(ntmbrr)));
+#endif // TEST_STD_VER < 23
struct RBeginReturnsArrayRef {
auto rbegin() const noexcept -> int(&)[10];
} brar;
static_assert(noexcept(std::ranges::rbegin(brar)));
+#if TEST_STD_VER < 23
static_assert(noexcept(std::ranges::crbegin(brar)));
+#endif // TEST_STD_VER < 23
struct NoThrowBeginThrowingEnd {
int* begin() const noexcept;
int* end() const;
} ntbte;
static_assert(!noexcept(std::ranges::rbegin(ntbte)));
+#if TEST_STD_VER < 23
static_assert(!noexcept(std::ranges::crbegin(ntbte)));
+#endif // TEST_STD_VER < 23
struct NoThrowEndThrowingBegin {
int* begin() const;
int* end() const noexcept;
} ntetb;
static_assert(noexcept(std::ranges::rbegin(ntetb)));
+#if TEST_STD_VER < 23
static_assert(noexcept(std::ranges::crbegin(ntetb)));
+#endif // TEST_STD_VER < 23
// Test ADL-proofing.
struct Incomplete;
template<class T> struct Holder { T t; };
static_assert(!std::is_invocable_v<RangeRBeginT, Holder<Incomplete>*>);
static_assert(!std::is_invocable_v<RangeRBeginT, Holder<Incomplete>*&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCRBeginT, Holder<Incomplete>*>);
static_assert(!std::is_invocable_v<RangeCRBeginT, Holder<Incomplete>*&>);
+#endif // TEST_STD_VER < 23
int main(int, char**) {
static_assert(testReturnTypes());
diff --git a/libcxx/test/std/ranges/range.access/rend.pass.cpp b/libcxx/test/std/ranges/range.access/rend.pass.cpp
index f5f59edf19393f..adb150461e044b 100644
--- a/libcxx/test/std/ranges/range.access/rend.pass.cpp
+++ b/libcxx/test/std/ranges/range.access/rend.pass.cpp
@@ -9,7 +9,7 @@
// UNSUPPORTED: c++03, c++11, c++14, c++17
// std::ranges::rend
-// std::ranges::crend
+// std::ranges::crend // before C++23
#include <ranges>
@@ -19,7 +19,9 @@
#include "test_iterators.h"
using RangeREndT = decltype(std::ranges::rend);
+#if TEST_STD_VER < 23
using RangeCREndT = decltype(std::ranges::crend);
+#endif // TEST_STD_VER < 23
static int globalBuff[8];
@@ -27,16 +29,20 @@ static_assert(!std::is_invocable_v<RangeREndT, int (&&)[]>);
static_assert(!std::is_invocable_v<RangeREndT, int (&)[]>);
static_assert(!std::is_invocable_v<RangeREndT, int (&&)[10]>);
static_assert( std::is_invocable_v<RangeREndT, int (&)[10]>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCREndT, int (&&)[]>);
static_assert(!std::is_invocable_v<RangeCREndT, int (&)[]>);
static_assert(!std::is_invocable_v<RangeCREndT, int (&&)[10]>);
static_assert( std::is_invocable_v<RangeCREndT, int (&)[10]>);
+#endif // TEST_STD_VER < 23
struct Incomplete;
static_assert(!std::is_invocable_v<RangeREndT, Incomplete(&&)[]>);
static_assert(!std::is_invocable_v<RangeREndT, Incomplete(&&)[42]>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCREndT, Incomplete(&&)[]>);
static_assert(!std::is_invocable_v<RangeCREndT, Incomplete(&&)[42]>);
+#endif // TEST_STD_VER < 23
struct REndMember {
int x;
@@ -49,50 +55,50 @@ static_assert( std::is_invocable_v<RangeREndT, REndMember&>);
static_assert(!std::is_invocable_v<RangeREndT, REndMember &&>);
static_assert( std::is_invocable_v<RangeREndT, REndMember const&>);
static_assert(!std::is_invocable_v<RangeREndT, REndMember const&&>);
+#if TEST_STD_VER < 23
static_assert( std::is_invocable_v<RangeCREndT, REndMember &>);
static_assert(!std::is_invocable_v<RangeCREndT, REndMember &&>);
static_assert( std::is_invocable_v<RangeCREndT, REndMember const&>);
static_assert(!std::is_invocable_v<RangeCREndT, REndMember const&&>);
+#endif // TEST_STD_VER < 23
constexpr bool testReturnTypes() {
- {
- int *x[2];
- ASSERT_SAME_TYPE(decltype(std::ranges::rend(x)), std::reverse_iterator<int**>);
- ASSERT_SAME_TYPE(decltype(std::ranges::crend(x)), std::reverse_iterator<int* const*>);
- }
-
- {
- int x[2][2];
- ASSERT_SAME_TYPE(decltype(std::ranges::rend(x)), std::reverse_iterator<int(*)[2]>);
- ASSERT_SAME_TYPE(decltype(std::ranges::crend(x)), std::reverse_iterator<const int(*)[2]>);
- }
-
- {
- struct Different {
- char* rbegin();
- sentinel_wrapper<char*>& rend();
- short* rbegin() const;
- sentinel_wrapper<short*>& rend() const;
- } x;
- ASSERT_SAME_TYPE(decltype(std::ranges::rend(x)), sentinel_wrapper<char*>);
- ASSERT_SAME_TYPE(decltype(std::ranges::crend(x)), sentinel_wrapper<short*>);
- }
+ int* a[2];
+ int b[2][2];
+ struct Different {
+ char* rbegin();
+ sentinel_wrapper<char*>& rend();
+ short* rbegin() const;
+ sentinel_wrapper<short*>& rend() const;
+ } c;
+
+ ASSERT_SAME_TYPE(decltype(std::ranges::rend(a)), std::reverse_iterator<int**>);
+ ASSERT_SAME_TYPE(decltype(std::ranges::rend(b)), std::reverse_iterator<int(*)[2]>);
+ ASSERT_SAME_TYPE(decltype(std::ranges::rend(c)), sentinel_wrapper<char*>);
+
+#if TEST_STD_VER < 23
+ ASSERT_SAME_TYPE(decltype(std::ranges::crend(a)), std::reverse_iterator<int* const*>);
+ ASSERT_SAME_TYPE(decltype(std::ranges::crend(b)), std::reverse_iterator<const int(*)[2]>);
+ ASSERT_SAME_TYPE(decltype(std::ranges::crend(c)), sentinel_wrapper<short*>);
+#endif // TEST_STD_VER < 23
return true;
}
constexpr bool testArray() {
int a[2];
- assert(std::ranges::rend(a).base() == a);
- assert(std::ranges::crend(a).base() == a);
-
int b[2][2];
- assert(std::ranges::rend(b).base() == b);
- assert(std::ranges::crend(b).base() == b);
-
REndMember c[2];
+
+ assert(std::ranges::rend(a).base() == a);
+ assert(std::ranges::rend(b).base() == b);
assert(std::ranges::rend(c).base() == c);
+
+#if TEST_STD_VER < 23
+ assert(std::ranges::crend(b).base() == b);
+ assert(std::ranges::crend(a).base() == a);
assert(std::ranges::crend(c).base() == c);
+#endif // TEST_STD_VER < 23
return true;
}
@@ -130,8 +136,10 @@ struct NonConstREndMember {
};
static_assert( std::is_invocable_v<RangeREndT, NonConstREndMember &>);
static_assert(!std::is_invocable_v<RangeREndT, NonConstREndMember const&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCREndT, NonConstREndMember &>);
static_assert(!std::is_invocable_v<RangeCREndT, NonConstREndMember const&>);
+#endif // TEST_STD_VER < 23
struct EnabledBorrowingREndMember {
constexpr int* rbegin() const { return nullptr; }
@@ -163,24 +171,24 @@ struct EmptyPtrREndMember {
constexpr bool testREndMember() {
REndMember a;
- assert(std::ranges::rend(a) == &a.x);
- assert(std::ranges::crend(a) == &a.x);
-
NonConstREndMember b;
- assert(std::ranges::rend(b) == &b.x);
- static_assert(!std::is_invocable_v<RangeCREndT, decltype((b))>);
-
EnabledBorrowingREndMember c;
- assert(std::ranges::rend(std::move(c)) == &globalBuff[0]);
- assert(std::ranges::crend(std::move(c)) == &globalBuff[0]);
-
REndMemberFunction d;
- assert(std::ranges::rend(d) == &d.x);
- assert(std::ranges::crend(d) == &d.x);
-
EmptyPtrREndMember e;
+
+ assert(std::ranges::rend(a) == &a.x);
+ assert(std::ranges::rend(b) == &b.x);
+ assert(std::ranges::rend(std::move(c)) == &globalBuff[0]);
+ assert(std::ranges::rend(d) == &d.x);
assert(std::ranges::rend(e) == &e.x);
+
+#if TEST_STD_VER < 23
+ assert(std::ranges::crend(a) == &a.x);
+ static_assert(!std::is_invocable_v<RangeCREndT, decltype((b))>);
+ assert(std::ranges::crend(std::move(c)) == &globalBuff[0]);
+ assert(std::ranges::crend(d) == &d.x);
assert(std::ranges::crend(e) == &e.x);
+#endif // TEST_STD_VER < 23
return true;
}
@@ -197,8 +205,10 @@ static_assert(!std::is_invocable_v<RangeREndT, REndFunction &&>);
static_assert( std::is_invocable_v<RangeREndT, REndFunction const&>);
static_assert(!std::is_invocable_v<RangeREndT, REndFunction &&>);
static_assert(std::is_invocable_v<RangeREndT, REndFunction&>); // Ill-formed before P2602R2 Poison Pills are Too Toxic
+#if TEST_STD_VER < 23
static_assert( std::is_invocable_v<RangeCREndT, REndFunction const&>);
static_assert( std::is_invocable_v<RangeCREndT, REndFunction &>);
+#endif // TEST_STD_VER < 23
struct REndFunctionReturnsInt {
friend constexpr int rbegin(REndFunctionReturnsInt const&);
@@ -233,7 +243,9 @@ struct REndFunctionByValue {
friend constexpr int* rbegin(REndFunctionByValue) { return nullptr; }
friend constexpr int* rend(REndFunctionByValue) { return &globalBuff[1]; }
};
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCREndT, REndFunctionByValue>);
+#endif // TEST_STD_VER < 23
struct REndFunctionEnabledBorrowing {
friend constexpr int* rbegin(REndFunctionEnabledBorrowing) { return nullptr; }
@@ -269,47 +281,45 @@ struct RBeginMemberEndFunction {
constexpr bool testREndFunction() {
const REndFunction a{};
- assert(std::ranges::rend(a) == &a.x);
- assert(std::ranges::crend(a) == &a.x);
REndFunction aa{};
- assert(std::ranges::rend(aa) == &aa.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
- assert(std::ranges::crend(aa) == &aa.x);
-
REndFunctionByValue b;
- assert(std::ranges::rend(b) == &globalBuff[1]);
- assert(std::ranges::crend(b) == &globalBuff[1]);
-
REndFunctionEnabledBorrowing c;
- assert(std::ranges::rend(std::move(c)) == &globalBuff[2]);
- assert(std::ranges::crend(std::move(c)) == &globalBuff[2]);
-
const REndFunctionReturnsEmptyPtr d{};
- assert(std::ranges::rend(d) == &d.x);
- assert(std::ranges::crend(d) == &d.x);
REndFunctionReturnsEmptyPtr dd{};
- assert(std::ranges::rend(dd) == &dd.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
- assert(std::ranges::crend(dd) == &dd.x);
-
const REndFunctionWithDataMember e{};
- assert(std::ranges::rend(e) == &e.x);
- assert(std::ranges::crend(e) == &e.x);
REndFunctionWithDataMember ee{};
- assert(std::ranges::rend(ee) == &ee.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
- assert(std::ranges::crend(ee) == &ee.x);
-
const REndFunctionWithPrivateEndMember f{};
- assert(std::ranges::rend(f) == &f.y);
- assert(std::ranges::crend(f) == &f.y);
REndFunctionWithPrivateEndMember ff{};
- assert(std::ranges::rend(ff) == &ff.y); // Ill-formed before P2602R2 Poison Pills are Too Toxic
- assert(std::ranges::crend(ff) == &ff.y);
-
const RBeginMemberEndFunction g{};
- assert(std::ranges::rend(g) == &g.x);
- assert(std::ranges::crend(g) == &g.x);
RBeginMemberEndFunction gg{};
+
+ assert(std::ranges::rend(a) == &a.x);
+ assert(std::ranges::rend(aa) == &aa.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
+ assert(std::ranges::rend(b) == &globalBuff[1]);
+ assert(std::ranges::rend(std::move(c)) == &globalBuff[2]);
+ assert(std::ranges::rend(d) == &d.x);
+ assert(std::ranges::rend(dd) == &dd.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
+ assert(std::ranges::rend(e) == &e.x);
+ assert(std::ranges::rend(ee) == &ee.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
+ assert(std::ranges::rend(f) == &f.y);
+ assert(std::ranges::rend(ff) == &ff.y); // Ill-formed before P2602R2 Poison Pills are Too Toxic
+ assert(std::ranges::rend(g) == &g.x);
assert(std::ranges::rend(gg) == &gg.x); // Ill-formed before P2602R2 Poison Pills are Too Toxic
+
+#if TEST_STD_VER < 23
+ assert(std::ranges::crend(a) == &a.x);
+ assert(std::ranges::crend(aa) == &aa.x);
+ assert(std::ranges::crend(b) == &globalBuff[1]);
+ assert(std::ranges::crend(std::move(c)) == &globalBuff[2]);
+ assert(std::ranges::crend(d) == &d.x);
+ assert(std::ranges::crend(dd) == &dd.x);
+ assert(std::ranges::crend(e) == &e.x);
+ assert(std::ranges::crend(ee) == &ee.x);
+ assert(std::ranges::crend(f) == &f.y);
+ assert(std::ranges::crend(ff) == &ff.y);
+ assert(std::ranges::crend(g) == &g.x);
assert(std::ranges::crend(gg) == &gg.x);
+#endif // TEST_STD_VER < 23
return true;
}
@@ -325,7 +335,9 @@ struct MemberBeginEnd {
};
static_assert( std::is_invocable_v<RangeREndT, MemberBeginEnd&>);
static_assert( std::is_invocable_v<RangeREndT, MemberBeginEnd const&>);
+#if TEST_STD_VER < 23
static_assert( std::is_invocable_v<RangeCREndT, MemberBeginEnd const&>);
+#endif // TEST_STD_VER < 23
struct FunctionBeginEnd {
int b, e;
@@ -343,7 +355,9 @@ struct FunctionBeginEnd {
};
static_assert( std::is_invocable_v<RangeREndT, FunctionBeginEnd&>);
static_assert( std::is_invocable_v<RangeREndT, FunctionBeginEnd const&>);
+#if TEST_STD_VER < 23
static_assert( std::is_invocable_v<RangeCREndT, FunctionBeginEnd const&>);
+#endif // TEST_STD_VER < 23
struct MemberBeginFunctionEnd {
int b, e;
@@ -359,7 +373,9 @@ struct MemberBeginFunctionEnd {
};
static_assert( std::is_invocable_v<RangeREndT, MemberBeginFunctionEnd&>);
static_assert( std::is_invocable_v<RangeREndT, MemberBeginFunctionEnd const&>);
+#if TEST_STD_VER < 23
static_assert( std::is_invocable_v<RangeCREndT, MemberBeginFunctionEnd const&>);
+#endif // TEST_STD_VER < 23
struct FunctionBeginMemberEnd {
int b, e;
@@ -375,59 +391,77 @@ struct FunctionBeginMemberEnd {
};
static_assert( std::is_invocable_v<RangeREndT, FunctionBeginMemberEnd&>);
static_assert( std::is_invocable_v<RangeREndT, FunctionBeginMemberEnd const&>);
+#if TEST_STD_VER < 23
static_assert( std::is_invocable_v<RangeCREndT, FunctionBeginMemberEnd const&>);
+#endif // TEST_STD_VER < 23
struct MemberBeginEndDifferentTypes {
bidirectional_iterator<int*> begin();
bidirectional_iterator<const int*> end();
};
static_assert(!std::is_invocable_v<RangeREndT, MemberBeginEndDifferentTypes&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCREndT, MemberBeginEndDifferentTypes&>);
+#endif // TEST_STD_VER < 23
struct FunctionBeginEndDifferentTypes {
friend bidirectional_iterator<int*> begin(FunctionBeginEndDifferentTypes&);
friend bidirectional_iterator<const int*> end(FunctionBeginEndDifferentTypes&);
};
static_assert(!std::is_invocable_v<RangeREndT, FunctionBeginEndDifferentTypes&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCREndT, FunctionBeginEndDifferentTypes&>);
+#endif // TEST_STD_VER < 23
struct MemberBeginEndForwardIterators {
forward_iterator<int*> begin();
forward_iterator<int*> end();
};
static_assert(!std::is_invocable_v<RangeREndT, MemberBeginEndForwardIterators&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCREndT, MemberBeginEndForwardIterators&>);
+#endif // TEST_STD_VER < 23
struct FunctionBeginEndForwardIterators {
friend forward_iterator<int*> begin(FunctionBeginEndForwardIterators&);
friend forward_iterator<int*> end(FunctionBeginEndForwardIterators&);
};
static_assert(!std::is_invocable_v<RangeREndT, FunctionBeginEndForwardIterators&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCREndT, FunctionBeginEndForwardIterators&>);
+#endif // TEST_STD_VER < 23
struct MemberBeginOnly {
bidirectional_iterator<int*> begin() const;
};
static_assert(!std::is_invocable_v<RangeREndT, MemberBeginOnly&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCREndT, MemberBeginOnly&>);
+#endif // TEST_STD_VER < 23
struct FunctionBeginOnly {
friend bidirectional_iterator<int*> begin(FunctionBeginOnly&);
};
static_assert(!std::is_invocable_v<RangeREndT, FunctionBeginOnly&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCREndT, FunctionBeginOnly&>);
+#endif // TEST_STD_VER < 23
struct MemberEndOnly {
bidirectional_iterator<int*> end() const;
};
static_assert(!std::is_invocable_v<RangeREndT, MemberEndOnly&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCREndT, MemberEndOnly&>);
+#endif // TEST_STD_VER < 23
struct FunctionEndOnly {
friend bidirectional_iterator<int*> end(FunctionEndOnly&);
};
static_assert(!std::is_invocable_v<RangeREndT, FunctionEndOnly&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCREndT, FunctionEndOnly&>);
+#endif // TEST_STD_VER < 23
// Make sure there is no clash between the following cases:
// - the case that handles classes defining member `rbegin` and `rend` functions;
@@ -438,53 +472,60 @@ struct MemberBeginAndRBegin {
int* rbegin() const;
int* rend() const;
};
-static_assert( std::is_invocable_v<RangeREndT, MemberBeginAndRBegin&>);
-static_assert( std::is_invocable_v<RangeCREndT, MemberBeginAndRBegin&>);
+static_assert(std::is_invocable_v<RangeREndT, MemberBeginAndRBegin&>);
static_assert( std::same_as<std::invoke_result_t<RangeREndT, MemberBeginAndRBegin&>, int*>);
+#if TEST_STD_VER < 23
+static_assert(std::is_invocable_v<RangeCREndT, MemberBeginAndRBegin&>);
static_assert( std::same_as<std::invoke_result_t<RangeCREndT, MemberBeginAndRBegin&>, int*>);
+#endif // TEST_STD_VER < 23
constexpr bool testBeginEnd() {
MemberBeginEnd a{};
const MemberBeginEnd aa{};
- assert(base(std::ranges::rend(a).base()) == &a.b);
- assert(base(std::ranges::crend(a).base()) == &a.cb);
- assert(base(std::ranges::rend(aa).base()) == &aa.cb);
- assert(base(std::ranges::crend(aa).base()) == &aa.cb);
-
FunctionBeginEnd b{};
const FunctionBeginEnd bb{};
- assert(base(std::ranges::rend(b).base()) == &b.b);
- assert(base(std::ranges::crend(b).base()) == &b.cb);
- assert(base(std::ranges::rend(bb).base()) == &bb.cb);
- assert(base(std::ranges::crend(bb).base()) == &bb.cb);
-
MemberBeginFunctionEnd c{};
const MemberBeginFunctionEnd cc{};
- assert(base(std::ranges::rend(c).base()) == &c.b);
- assert(base(std::ranges::crend(c).base()) == &c.cb);
- assert(base(std::ranges::rend(cc).base()) == &cc.cb);
- assert(base(std::ranges::crend(cc).base()) == &cc.cb);
-
FunctionBeginMemberEnd d{};
const FunctionBeginMemberEnd dd{};
+
+ assert(base(std::ranges::rend(a).base()) == &a.b);
+ assert(base(std::ranges::rend(aa).base()) == &aa.cb);
+ assert(base(std::ranges::rend(b).base()) == &b.b);
+ assert(base(std::ranges::rend(bb).base()) == &bb.cb);
+ assert(base(std::ranges::rend(c).base()) == &c.b);
+ assert(base(std::ranges::rend(cc).base()) == &cc.cb);
assert(base(std::ranges::rend(d).base()) == &d.b);
- assert(base(std::ranges::crend(d).base()) == &d.cb);
assert(base(std::ranges::rend(dd).base()) == &dd.cb);
+
+#if TEST_STD_VER < 23
+ assert(base(std::ranges::crend(a).base()) == &a.cb);
+ assert(base(std::ranges::crend(aa).base()) == &aa.cb);
+ assert(base(std::ranges::crend(b).base()) == &b.cb);
+ assert(base(std::ranges::crend(bb).base()) == &bb.cb);
+ assert(base(std::ranges::crend(c).base()) == &c.cb);
+ assert(base(std::ranges::crend(cc).base()) == &cc.cb);
+ assert(base(std::ranges::crend(d).base()) == &d.cb);
assert(base(std::ranges::crend(dd).base()) == &dd.cb);
+#endif // TEST_STD_VER < 23
return true;
}
ASSERT_NOEXCEPT(std::ranges::rend(std::declval<int (&)[10]>()));
+#if TEST_STD_VER < 23
ASSERT_NOEXCEPT(std::ranges::crend(std::declval<int (&)[10]>()));
+#endif // TEST_STD_VER < 23
struct NoThrowMemberREnd {
ThrowingIterator<int> rbegin() const;
ThrowingIterator<int> rend() const noexcept; // auto(t.rend()) doesn't throw
} ntmre;
static_assert(noexcept(std::ranges::rend(ntmre)));
+#if TEST_STD_VER < 23
static_assert(noexcept(std::ranges::crend(ntmre)));
+#endif // TEST_STD_VER < 23
struct NoThrowADLREnd {
ThrowingIterator<int> rbegin() const;
@@ -492,43 +533,55 @@ struct NoThrowADLREnd {
friend ThrowingIterator<int> rend(const NoThrowADLREnd&) noexcept;
} ntare;
static_assert(noexcept(std::ranges::rend(ntare)));
+#if TEST_STD_VER < 23
static_assert(noexcept(std::ranges::crend(ntare)));
+#endif // TEST_STD_VER < 23
struct NoThrowMemberREndReturnsRef {
ThrowingIterator<int> rbegin() const;
ThrowingIterator<int>& rend() const noexcept; // auto(t.rend()) may throw
} ntmrerr;
static_assert(!noexcept(std::ranges::rend(ntmrerr)));
+#if TEST_STD_VER < 23
static_assert(!noexcept(std::ranges::crend(ntmrerr)));
+#endif // TEST_STD_VER < 23
struct REndReturnsArrayRef {
auto rbegin() const noexcept -> int(&)[10];
auto rend() const noexcept -> int(&)[10];
} rerar;
static_assert(noexcept(std::ranges::rend(rerar)));
+#if TEST_STD_VER < 23
static_assert(noexcept(std::ranges::crend(rerar)));
+#endif // TEST_STD_VER < 23
struct NoThrowBeginThrowingEnd {
int* begin() const noexcept;
int* end() const;
} ntbte;
static_assert(noexcept(std::ranges::rend(ntbte)));
+#if TEST_STD_VER < 23
static_assert(noexcept(std::ranges::crend(ntbte)));
+#endif // TEST_STD_VER < 23
struct NoThrowEndThrowingBegin {
int* begin() const;
int* end() const noexcept;
} ntetb;
static_assert(!noexcept(std::ranges::rend(ntetb)));
+#if TEST_STD_VER < 23
static_assert(!noexcept(std::ranges::crend(ntetb)));
+#endif // TEST_STD_VER < 23
// Test ADL-proofing.
struct Incomplete;
template<class T> struct Holder { T t; };
static_assert(!std::is_invocable_v<RangeREndT, Holder<Incomplete>*>);
static_assert(!std::is_invocable_v<RangeREndT, Holder<Incomplete>*&>);
+#if TEST_STD_VER < 23
static_assert(!std::is_invocable_v<RangeCREndT, Holder<Incomplete>*>);
static_assert(!std::is_invocable_v<RangeCREndT, Holder<Incomplete>*&>);
+#endif // TEST_STD_VER < 23
int main(int, char**) {
static_assert(testReturnTypes());
diff --git a/libcxx/test/std/ranges/range.adaptors/range.as.const/adaptor.pass.cpp b/libcxx/test/std/ranges/range.adaptors/range.as.const/adaptor.pass.cpp
new file mode 100644
index 00000000000000..a4bee123857337
--- /dev/null
+++ b/libcxx/test/std/ranges/range.adaptors/range.as.const/adaptor.pass.cpp
@@ -0,0 +1,156 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+
+// std::views::as_const
+
+#include <array>
+#include <cassert>
+#include <functional>
+#include <ranges>
+#include <vector>
+
+#include "test_iterators.h"
+
+template <class View, class T>
+concept HasPipe = requires {
+ { std::declval<View>() | std::declval<T>() };
+};
+
+struct DefaultConstructibleView : std::ranges::view_base {
+ int i_;
+ int* begin();
+ int* end();
+};
+struct NoView {};
+
+static_assert(std::is_invocable_v<decltype(std::views::as_const), DefaultConstructibleView>);
+static_assert(!std::is_invocable_v<decltype(std::views::as_const)>);
+static_assert(!std::is_invocable_v<decltype(std::views::as_const), NoView>);
+static_assert(HasPipe<DefaultConstructibleView&, decltype(std::views::as_const)>);
+static_assert(HasPipe<int (&)[10], decltype(std::views::as_const)>);
+static_assert(!HasPipe<int (&&)[10], decltype(std::views::as_const)>);
+static_assert(!HasPipe<NoView, decltype(std::views::as_const)>);
+static_assert(std::is_same_v<decltype(std::views::as_const), decltype(std::ranges::views::as_const)>);
+
+struct const_iterator_range {
+ constexpr std::const_iterator<int*> begin() const { return {}; }
+ constexpr std::const_iterator<int*> end() const { return {}; }
+};
+static_assert(!std::ranges::view<const_iterator_range>);
+static_assert(std::ranges::range<const_iterator_range>);
+
+constexpr bool test() {
+ // Let E be an expression, let T be decltype((E)), and let U be remove_cvref_t<T>.
+ // The expression views::as_const(E) is expression-equivalent to:
+
+ // - If views::all_t<T> models constant_range, then views::all(E).
+ {
+ [[maybe_unused]] std::same_as<std::views::all_t<const_iterator_range>> decltype(auto) view =
+ std::views::as_const(const_iterator_range{});
+ }
+ {
+ // ambiguous with empty_view case
+ [[maybe_unused]] std::same_as<std::views::all_t<std::ranges::empty_view<const int>>> decltype(auto) view =
+ std::views::empty<const int> | std::views::as_const;
+ }
+ {
+ // ambiguous with span case
+ int a[3] = {};
+ [[maybe_unused]] std::same_as<std::views::all_t<std::span<const int>>> decltype(auto) view1 =
+ std::span<const int>(a) | std::views::as_const;
+ [[maybe_unused]] std::same_as<std::views::all_t<std::span<const int, 3>>> decltype(auto) view2 =
+ std::span<const int, 3>(a) | std::views::as_const;
+ }
+ {
+ // ambiguous with ref_view case
+ std::array<int, 3> a = {};
+ std::ranges::ref_view<const std::array<int, 3>> r = a;
+ [[maybe_unused]] std::same_as<std::ranges::ref_view<const std::array<int, 3>>> decltype(auto) view =
+ r | std::views::as_const;
+ }
+ {
+ // ambiguous with constant_range case
+ std::array<const int, 3> a = {};
+ [[maybe_unused]] std::same_as<std::ranges::ref_view<std::array<const int, 3>>> decltype(auto) view =
+ a | std::views::as_const;
+ }
+
+ // - Otherwise, if U denotes empty_view<X> for some type X, then auto(views::empty<const X>).
+ {
+ [[maybe_unused]] std::same_as<std::ranges::empty_view<const int>> decltype(auto) view =
+ std::views::empty<int> | std::views::as_const;
+ }
+
+ // - Otherwise, if U denotes span<X, Extent> for some type X and some extent Extent, then span<const X, Extent>(E).
+ {
+ int a[3] = {};
+ std::same_as<std::span<const int>> decltype(auto) view = std::span<int>(a) | std::views::as_const;
+ assert(std::to_address(view.begin()) == a);
+ assert(std::to_address(view.end()) == a + 3);
+ }
+ {
+ int a[3] = {};
+ std::same_as<std::span<const int, 3>> decltype(auto) view = std::span<int, 3>(a) | std::views::as_const;
+ assert(std::to_address(view.begin()) == a);
+ assert(std::to_address(view.end()) == a + 3);
+ }
+
+ // - Otherwise, if U denotes ref_view<X> for some type X and const X models constant_range, then ref_view(static_cast<const X&>(E.base())).
+ {
+ std::array<int, 3> a = {};
+ std::ranges::ref_view<std::array<int, 3>> r = a;
+ [[maybe_unused]] std::same_as<std::ranges::ref_view<const std::array<int, 3>>> decltype(auto) view =
+ r | std::views::as_const;
+ }
+
+ // - Otherwise, if E is an lvalue, const U models constant_range, and U does not model view, then ref_view(static_cast<const U&>(E)).
+ {
+ std::array<int, 3> a = {};
+ [[maybe_unused]] std::same_as<std::ranges::ref_view<const std::array<int, 3>>> decltype(auto) view =
+ a | std::views::as_const;
+ }
+
+ // - Otherwise, as_const_view(E).
+ { // view | views::as_const
+ DefaultConstructibleView v{{}, 3};
+ std::same_as<std::ranges::as_const_view<DefaultConstructibleView>> decltype(auto) view = v | std::views::as_const;
+ assert(view.base().i_ == 3);
+ }
+
+ { // adaptor | views::as_const
+ DefaultConstructibleView v{{}, 3};
+ const auto partial = std::views::transform(std::identity{}) | std::views::as_const;
+ std::same_as<std::ranges::as_const_view<
+ std::ranges::transform_view<DefaultConstructibleView, std::identity>>> decltype(auto) view = partial(v);
+ assert(view.base().base().i_ == 3);
+ }
+
+ { // views::as_const | adaptor
+ DefaultConstructibleView v{{}, 3};
+ const auto partial = std::views::as_const | std::views::transform(std::identity{});
+ std::same_as<std::ranges::transform_view<std::ranges::as_const_view<DefaultConstructibleView>,
+ std::identity>> decltype(auto) view = partial(v);
+ assert(view.base().base().i_ == 3);
+ }
+
+ { // range | views::as_const
+ [[maybe_unused]] std::same_as<std::ranges::as_const_view<std::views::all_t<std::vector<int>>>> decltype(auto) view =
+ std::vector<int>{} | std::views::as_const;
+ }
+
+ return true;
+}
+
+int main(int, char**) {
+ test();
+ static_assert(test());
+
+ return 0;
+}
diff --git a/libcxx/test/std/ranges/range.adaptors/range.as.const/base.pass.cpp b/libcxx/test/std/ranges/range.adaptors/range.as.const/base.pass.cpp
new file mode 100644
index 00000000000000..c842c59f5ad66f
--- /dev/null
+++ b/libcxx/test/std/ranges/range.adaptors/range.as.const/base.pass.cpp
@@ -0,0 +1,78 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+
+// constexpr V base() const& requires copy_constructible<V> { return base_; }
+// constexpr V base() && { return std::move(base_); }
+
+#include <cassert>
+#include <ranges>
+#include <utility>
+
+#include "MoveOnly.h"
+
+struct SimpleView : std::ranges::view_base {
+ int i;
+ int* begin() const;
+ int* end() const;
+};
+
+struct MoveOnlyView : SimpleView {
+ MoveOnly m;
+};
+
+template <class T>
+concept HasBase = requires(T&& t) { std::forward<T>(t).base(); };
+
+static_assert(HasBase<std::ranges::as_const_view<SimpleView> const&>);
+static_assert(HasBase<std::ranges::as_const_view<SimpleView>&&>);
+
+static_assert(!HasBase<std::ranges::as_const_view<MoveOnlyView> const&>);
+static_assert(HasBase<std::ranges::as_const_view<MoveOnlyView>&&>);
+
+constexpr bool test() {
+ { // const &
+ const std::ranges::as_const_view<SimpleView> view(SimpleView{{}, 5});
+ std::same_as<SimpleView> decltype(auto) v = view.base();
+ assert(v.i == 5);
+ }
+
+ { // &
+ std::ranges::as_const_view<SimpleView> view(SimpleView{{}, 5});
+ std::same_as<SimpleView> decltype(auto) v = view.base();
+ assert(v.i == 5);
+ }
+
+ { // &&
+ std::ranges::as_const_view<SimpleView> view(SimpleView{{}, 5});
+ std::same_as<SimpleView> decltype(auto) v = std::move(view).base();
+ assert(v.i == 5);
+ }
+
+ { // const &&
+ const std::ranges::as_const_view<SimpleView> view(SimpleView{{}, 5});
+ std::same_as<SimpleView> decltype(auto) v = std::move(view).base();
+ assert(v.i == 5);
+ }
+
+ { // move only
+ std::ranges::as_const_view<MoveOnlyView> view(MoveOnlyView{{}, 5});
+ std::same_as<MoveOnlyView> decltype(auto) v = std::move(view).base();
+ assert(v.m.get() == 5);
+ }
+
+ return true;
+}
+
+int main(int, char**) {
+ test();
+ static_assert(test());
+
+ return 0;
+}
diff --git a/libcxx/test/std/ranges/range.adaptors/range.as.const/begin.pass.cpp b/libcxx/test/std/ranges/range.adaptors/range.as.const/begin.pass.cpp
new file mode 100644
index 00000000000000..809a08bce2fcca
--- /dev/null
+++ b/libcxx/test/std/ranges/range.adaptors/range.as.const/begin.pass.cpp
@@ -0,0 +1,124 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+
+// constexpr auto begin()
+// constexpr auto begin() const
+
+#include <array>
+#include <cassert>
+#include <concepts>
+#include <ranges>
+
+#include "test_iterators.h"
+
+struct SimpleView : std::ranges::view_base {
+ int* begin() const;
+ int* end() const;
+};
+
+struct NonSimpleView : std::ranges::view_base {
+ char* begin();
+ char* end();
+ int* begin() const;
+ int* end() const;
+};
+
+struct NonConstView : std::ranges::view_base {
+ char* begin();
+ char* end();
+};
+
+template <class T>
+concept HasBegin = requires(T t) { t.begin(); };
+
+static_assert(HasBegin<std::ranges::as_const_view<SimpleView>>);
+static_assert(HasBegin<const std::ranges::as_const_view<SimpleView>>);
+static_assert(HasBegin<std::ranges::as_const_view<NonSimpleView>>);
+static_assert(HasBegin<const std::ranges::as_const_view<NonSimpleView>>);
+static_assert(HasBegin<std::ranges::as_const_view<NonConstView>>);
+static_assert(!HasBegin<const std::ranges::as_const_view<NonConstView>>);
+
+template <class Iter, class Sent>
+constexpr void test_range() {
+ int a[] = {1, 2};
+ std::ranges::subrange range(Iter(std::begin(a)), Sent(Iter(std::end(a))));
+ std::ranges::as_const_view view(std::move(range));
+ std::same_as<std::const_iterator<Iter>> decltype(auto) iter = view.begin();
+ assert(base(iter.base()) == std::begin(a));
+}
+
+template <class Iter, class Sent>
+class WrapRange {
+ Iter iter_;
+ Sent sent_;
+
+public:
+ constexpr WrapRange(Iter iter, Sent sent) : iter_(std::move(iter)), sent_(std::move(sent)) {}
+
+ constexpr Iter begin() const { return iter_; }
+ constexpr Sent end() const { return sent_; }
+};
+
+template <class Iter, class Sent>
+WrapRange(Iter, Sent) -> WrapRange<Iter, Sent>;
+
+template <class Iter, class Sent>
+constexpr void test_const_range() {
+ int a[] = {1, 2};
+ auto range = WrapRange{Iter(a), Sent(Iter(a + 2))};
+ const std::ranges::as_const_view view(std::views::all(range));
+ std::same_as<Iter> decltype(auto) iter = view.begin();
+ assert(base(iter) == std::begin(a));
+}
+
+struct const_pointer_view : std::ranges::view_base {
+ constexpr const int* begin() const { return {}; }
+ constexpr const int* end() const { return {}; }
+};
+struct const_iterator_view : std::ranges::view_base {
+ constexpr std::const_iterator<int*> begin() const { return {}; }
+ constexpr std::const_iterator<int*> end() const { return {}; }
+};
+
+constexpr bool test() {
+ types::for_each(types::cpp20_input_iterator_list<int*>{}, []<class Iter> {
+ if constexpr (std::sentinel_for<Iter, Iter>)
+ test_range<Iter, Iter>();
+ test_range<Iter, sentinel_wrapper<Iter>>();
+ test_range<Iter, sized_sentinel<Iter>>();
+ });
+
+ types::for_each(types::forward_iterator_list<const int*>{}, []<class Iter> {
+ test_const_range<Iter, Iter>();
+ test_const_range<Iter, sentinel_wrapper<Iter>>();
+ test_const_range<Iter, sized_sentinel<Iter>>();
+ });
+
+ // check that with a const_iterator begin() doesn't return std::const_iterator<const_iterator>
+ {
+ std::ranges::as_const_view view{const_pointer_view{}};
+ std::same_as<const int*> decltype(auto) it = view.begin();
+ assert(it == nullptr);
+ }
+ {
+ std::ranges::as_const_view view{const_iterator_view{}};
+ std::same_as<std::const_iterator<int*>> decltype(auto) it = view.begin();
+ assert(it == std::const_iterator<int*>{});
+ }
+
+ return true;
+}
+
+int main(int, char**) {
+ test();
+ static_assert(test());
+
+ return 0;
+}
diff --git a/libcxx/test/std/ranges/range.adaptors/range.as.const/ctad.compile.pass.cpp b/libcxx/test/std/ranges/range.adaptors/range.as.const/ctad.compile.pass.cpp
new file mode 100644
index 00000000000000..063b4bcd2c9941
--- /dev/null
+++ b/libcxx/test/std/ranges/range.adaptors/range.as.const/ctad.compile.pass.cpp
@@ -0,0 +1,22 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+
+#include <ranges>
+#include <vector>
+#include <utility>
+
+static_assert(std::is_same_v<decltype(std::ranges::as_const_view(std::vector<int>{})),
+ std::ranges::as_const_view<std::views::all_t<std::vector<int>>>>);
+
+static_assert(std::is_same_v<decltype(std::ranges::as_const_view(std::declval<std::vector<int>&>())),
+ std::ranges::as_const_view<std::views::all_t<std::vector<int>&>>>);
+
+static_assert(std::is_same_v<decltype(std::ranges::as_const_view(std::ranges::empty_view<int>{})),
+ std::ranges::as_const_view<std::ranges::empty_view<int>>>);
diff --git a/libcxx/test/std/ranges/range.adaptors/range.as.const/ctor.pass.cpp b/libcxx/test/std/ranges/range.adaptors/range.as.const/ctor.pass.cpp
new file mode 100644
index 00000000000000..54384c9305d1ce
--- /dev/null
+++ b/libcxx/test/std/ranges/range.adaptors/range.as.const/ctor.pass.cpp
@@ -0,0 +1,57 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+
+// std::ranges::as_const_view::as_const_view(...)
+
+#include <cassert>
+#include <ranges>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+struct DefaultConstructibleView : std::ranges::view_base {
+ int* begin() const;
+ int* end() const;
+
+ int i_ = 23;
+};
+
+struct NonDefaultConstructibleView : std::ranges::view_base {
+ NonDefaultConstructibleView(int i) : i_(i) {}
+
+ int* begin() const;
+ int* end() const;
+
+ int i_ = 23;
+};
+
+static_assert(!std::is_constructible_v<std::ranges::as_const_view<NonDefaultConstructibleView>>);
+static_assert(std::is_constructible_v<std::ranges::as_const_view<NonDefaultConstructibleView>, int>);
+static_assert(std::is_nothrow_constructible_v<std::ranges::as_const_view<DefaultConstructibleView>>);
+
+template <class T, class... Args>
+concept IsImplicitlyConstructible = requires(T val, Args... args) { val = {std::forward<Args>(args)...}; };
+
+static_assert(IsImplicitlyConstructible<std::ranges::as_const_view<DefaultConstructibleView>>);
+static_assert(!IsImplicitlyConstructible<std::ranges::as_const_view<NonDefaultConstructibleView>, int>);
+
+constexpr bool test() {
+ std::ranges::as_const_view<DefaultConstructibleView> view = {};
+ assert(view.base().i_ == 23);
+
+ return true;
+}
+
+int main(int, char**) {
+ static_assert(test());
+ test();
+
+ return 0;
+}
diff --git a/libcxx/test/std/ranges/range.adaptors/range.as.const/enable_borrowed_range.compile.pass.cpp b/libcxx/test/std/ranges/range.adaptors/range.as.const/enable_borrowed_range.compile.pass.cpp
new file mode 100644
index 00000000000000..5086f6fdb50b2e
--- /dev/null
+++ b/libcxx/test/std/ranges/range.adaptors/range.as.const/enable_borrowed_range.compile.pass.cpp
@@ -0,0 +1,16 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+
+#include <ranges>
+#include <vector>
+
+static_assert(std::ranges::enable_borrowed_range<std::ranges::as_const_view<std::ranges::empty_view<int>>>);
+static_assert(std::ranges::enable_borrowed_range<std::ranges::as_const_view<std::views::all_t<std::vector<int>&>>>);
+static_assert(!std::ranges::enable_borrowed_range<std::ranges::as_const_view<std::views::all_t<std::vector<int>>>>);
diff --git a/libcxx/test/std/ranges/range.adaptors/range.as.const/end.pass.cpp b/libcxx/test/std/ranges/range.adaptors/range.as.const/end.pass.cpp
new file mode 100644
index 00000000000000..e7c7b16f74011d
--- /dev/null
+++ b/libcxx/test/std/ranges/range.adaptors/range.as.const/end.pass.cpp
@@ -0,0 +1,129 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+
+// constexpr auto end()
+// constexpr auto end() const
+
+#include <array>
+#include <cassert>
+#include <ranges>
+
+#include "test_iterators.h"
+
+struct DefaultConstructibleView : std::ranges::view_base {
+ int* begin() const;
+ int* end() const;
+};
+
+struct NonConstCommonRange : std::ranges::view_base {
+ int* begin();
+ int* end();
+
+ int* begin() const;
+ sentinel_wrapper<int*> end() const;
+};
+
+struct NonConstView : std::ranges::view_base {
+ int* begin();
+ int* end();
+};
+
+template <class T>
+concept HasEnd = requires(T t) { t.end(); };
+
+static_assert(HasEnd<std::ranges::as_const_view<DefaultConstructibleView>>);
+static_assert(HasEnd<const std::ranges::as_const_view<DefaultConstructibleView>>);
+static_assert(HasEnd<std::ranges::as_const_view<NonConstView>>);
+static_assert(!HasEnd<const std::ranges::as_const_view<NonConstView>>);
+
+static_assert(std::is_same_v<decltype(std::declval<std::ranges::as_const_view<DefaultConstructibleView>>().end()),
+ std::const_iterator<int*>>);
+static_assert(std::is_same_v<decltype(std::declval<const std::ranges::as_const_view<NonConstCommonRange>>().end()),
+ std::const_sentinel<sentinel_wrapper<int*>>>);
+
+template <class Iter, class Sent>
+constexpr void test_range() {
+ int a[] = {1, 2};
+ std::ranges::subrange range(Iter(std::begin(a)), Sent(Iter(std::end(a))));
+ std::ranges::as_const_view view(std::move(range));
+ std::same_as<std::const_sentinel<Sent>> decltype(auto) iter = view.end();
+ assert(base(base(iter)) == std::end(a));
+}
+
+template <class Iter, class Sent>
+class WrapRange {
+ Iter iter_;
+ Sent sent_;
+
+public:
+ constexpr WrapRange(Iter iter, Sent sent) : iter_(std::move(iter)), sent_(std::move(sent)) {}
+
+ constexpr Iter begin() const { return iter_; }
+ constexpr Sent end() const { return sent_; }
+};
+
+template <class Iter, class Sent>
+WrapRange(Iter, Sent) -> WrapRange<Iter, Sent>;
+
+template <class Iter, class Sent, bool is_common>
+constexpr void test_const_range() {
+ int a[] = {1, 2};
+ auto range = WrapRange{Iter(a), Sent(Iter(a + 2))};
+ const std::ranges::as_const_view view(std::move(range));
+ std::same_as<std::const_sentinel<Sent>> decltype(auto) iter = view.end();
+ assert(base(base(iter)) == std::end(a));
+}
+
+struct const_pointer_view : std::ranges::view_base {
+ constexpr const int* begin() const { return {}; }
+ constexpr const int* end() const { return {}; }
+};
+struct const_iterator_view : std::ranges::view_base {
+ constexpr std::const_iterator<int*> begin() const { return {}; }
+ constexpr std::const_iterator<int*> end() const { return {}; }
+};
+
+constexpr bool test() {
+ test_range<cpp17_input_iterator<int*>, sentinel_wrapper<cpp17_input_iterator<int*>>>();
+ test_range<cpp17_input_iterator<int*>, sized_sentinel<cpp17_input_iterator<int*>>>();
+ test_range<cpp20_input_iterator<int*>, sentinel_wrapper<cpp20_input_iterator<int*>>>();
+ test_range<cpp20_input_iterator<int*>, sized_sentinel<cpp20_input_iterator<int*>>>();
+
+ types::for_each(types::forward_iterator_list<int*>{}, []<class Iter> {
+ test_range<Iter, Iter>();
+ test_range<Iter, sentinel_wrapper<Iter>>();
+ test_range<Iter, sized_sentinel<Iter>>();
+ });
+
+ // check that with a const_iterator end() doesn't return std::const_iterator<const_iterator>
+ {
+ std::ranges::as_const_view view{const_pointer_view{}};
+ std::same_as<const int*> decltype(auto) it = view.end();
+ assert(it == nullptr);
+ }
+ {
+ std::ranges::as_const_view view{const_iterator_view{}};
+ std::same_as<std::const_iterator<int*>> decltype(auto) it = view.end();
+ assert(it == std::const_iterator<int*>{});
+ }
+
+ return true;
+}
+
+int main(int, char**) {
+ test();
+
+// gcc cannot have mutable member in constant expression
+#if !defined(TEST_COMPILER_GCC)
+ static_assert(test());
+#endif
+
+ return 0;
+}
diff --git a/libcxx/test/std/ranges/range.adaptors/range.as.const/size.pass.cpp b/libcxx/test/std/ranges/range.adaptors/range.as.const/size.pass.cpp
new file mode 100644
index 00000000000000..62f8282ddc0b6d
--- /dev/null
+++ b/libcxx/test/std/ranges/range.adaptors/range.as.const/size.pass.cpp
@@ -0,0 +1,80 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// constexpr auto size()
+// constexpr auto size() const
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+
+#include <cassert>
+#include <cstddef>
+#include <ranges>
+
+struct ConstSizedView : std::ranges::view_base {
+ bool* size_called;
+ int* begin() const;
+ int* end() const;
+
+ constexpr std::size_t size() const {
+ *size_called = true;
+ return 3;
+ }
+};
+
+struct SizedView : std::ranges::view_base {
+ bool* size_called;
+ int* begin() const;
+ int* end() const;
+
+ constexpr int size() {
+ *size_called = true;
+ return 5;
+ }
+};
+
+struct UnsizedView : std::ranges::view_base {
+ int* begin() const;
+ int* end() const;
+};
+
+template <class T>
+concept HasSize = requires(T v) { v.size(); };
+
+static_assert(HasSize<ConstSizedView>);
+static_assert(HasSize<const ConstSizedView>);
+static_assert(HasSize<SizedView>);
+static_assert(!HasSize<const SizedView>);
+static_assert(!HasSize<UnsizedView>);
+static_assert(!HasSize<const UnsizedView>);
+
+constexpr bool test() {
+ {
+ bool size_called = false;
+ std::ranges::as_const_view view(ConstSizedView{{}, &size_called});
+ std::same_as<std::size_t> auto size = view.size();
+ assert(size == 3);
+ assert(size_called);
+ }
+
+ {
+ bool size_called = false;
+ std::ranges::as_const_view view(SizedView{{}, &size_called});
+ std::same_as<int> auto size = view.size();
+ assert(size == 5);
+ assert(size_called);
+ }
+
+ return true;
+}
+
+int main(int, char**) {
+ test();
+ static_assert(test());
+
+ return 0;
+}
diff --git a/libcxx/test/std/ranges/range.utility/view.interface/view.interface.pass.cpp b/libcxx/test/std/ranges/range.utility/view.interface/view.interface.pass.cpp
index 3f7c174d3fe48a..8c711cd7708622 100644
--- a/libcxx/test/std/ranges/range.utility/view.interface/view.interface.pass.cpp
+++ b/libcxx/test/std/ranges/range.utility/view.interface/view.interface.pass.cpp
@@ -35,8 +35,15 @@ using InputIter = cpp20_input_iterator<const int*>;
struct InputRange : std::ranges::view_interface<InputRange> {
int buff[8] = {0, 1, 2, 3, 4, 5, 6, 7};
+
constexpr InputIter begin() const { return InputIter(buff); }
- constexpr InputIter end() const { return InputIter(buff + 8); }
+ constexpr sentinel_wrapper<InputIter> end() const { return sentinel_wrapper(InputIter(buff + 8)); }
+};
+
+struct NonConstInputRange : std::ranges::view_interface<NonConstInputRange> {
+ int buff[8] = {0, 1, 2, 3, 4, 5, 6, 7};
+ constexpr InputIter begin() { return InputIter(buff); }
+ constexpr sentinel_wrapper<InputIter> end() { return sentinel_wrapper(InputIter(buff + 8)); }
};
struct SizedInputRange : std::ranges::view_interface<SizedInputRange> {
@@ -222,6 +229,19 @@ constexpr bool testEmpty() {
return true;
}
+#if TEST_STD_VER >= 23
+template <class T>
+concept ConstAccessorsInvocable = requires(T& t) {
+ t.cbegin();
+ t.cend();
+};
+
+static_assert(ConstAccessorsInvocable<InputRange>);
+static_assert(ConstAccessorsInvocable<const InputRange>);
+static_assert(ConstAccessorsInvocable<NonConstInputRange>);
+static_assert(!ConstAccessorsInvocable<const NonConstInputRange>);
+#endif // TEST_STD_VER >= 23
+
template<class T>
concept DataInvocable = requires (T const& obj) { obj.data(); };
diff --git a/libcxx/test/support/test_iterators.h b/libcxx/test/support/test_iterators.h
index 419f1d86730b85..3f70fa0f258368 100644
--- a/libcxx/test/support/test_iterators.h
+++ b/libcxx/test/support/test_iterators.h
@@ -511,6 +511,13 @@ template <class It>
three_way_contiguous_iterator(It) -> three_way_contiguous_iterator<It>;
#endif // TEST_STD_VER > 17
+#if TEST_STD_VER >= 23
+template <class Iter>
+TEST_CONSTEXPR Iter base(std::basic_const_iterator<Iter> i) {
+ return i.base();
+}
+#endif
+
template <class Iter> // ADL base() for everything else (including pointers)
TEST_CONSTEXPR Iter base(Iter i) { return i; }
diff --git a/libcxx/test/support/test_macros.h b/libcxx/test/support/test_macros.h
index 5d4c1a65cfafb2..e9b00ea93dfdb1 100644
--- a/libcxx/test/support/test_macros.h
+++ b/libcxx/test/support/test_macros.h
@@ -277,6 +277,12 @@ struct is_same<T, T> { enum {value = 1}; };
static_assert((test_macros_detail::is_same<__VA_ARGS__>::value), \
"Types differ unexpectedly")
+#define ASSERT_RUNTIME_AND_CONSTEXPR(...) \
+ do { \
+ assert((__VA_ARGS__)); \
+ static_assert(__VA_ARGS__); \
+ } while (0)
+
#ifndef TEST_HAS_NO_EXCEPTIONS
#define TEST_THROW(...) throw __VA_ARGS__
#else
diff --git a/libcxx/utils/generate_feature_test_macro_components.py b/libcxx/utils/generate_feature_test_macro_components.py
index 3bdd3adad15b4e..185111407e9421 100755
--- a/libcxx/utils/generate_feature_test_macro_components.py
+++ b/libcxx/utils/generate_feature_test_macro_components.py
@@ -1001,11 +1001,9 @@ def add_version_header(tc):
{
"name": "__cpp_lib_ranges_as_const",
"values": {
- "c++23": 202207 # P2278R4 cbegin should always return a constant iterator
- # 202311 # DR P2836R1 std::basic_const_iterator should follow its underlying type’s convertibility
+ "c++23": 202311 # DR P2836R1 std::basic_const_iterator should follow its underlying type’s convertibility
},
"headers": ["ranges"],
- "unimplemented": True,
},
{
"name": "__cpp_lib_ranges_as_rvalue",
>From 9c2f7ca3396d67d29f357f1379c4b0032c082995 Mon Sep 17 00:00:00 2001
From: "A. Jiang" <de34 at live.cn>
Date: Thu, 31 Oct 2024 22:40:25 +0800
Subject: [PATCH 2/5] Remove a mistakenly merged line in `module.modulemap`
---
libcxx/include/module.modulemap | 1 -
1 file changed, 1 deletion(-)
diff --git a/libcxx/include/module.modulemap b/libcxx/include/module.modulemap
index d5be371636fb3d..227a6859b73007 100644
--- a/libcxx/include/module.modulemap
+++ b/libcxx/include/module.modulemap
@@ -1928,7 +1928,6 @@ module std [system] {
module support {
header "__thread/support.h"
-module std_private_iterator_const_iterator [system] { header "__iterator/const_iterator.h" }
export *
}
module support_impl {
>From 2601e34ad479d71712c873c16e957564b8fbcaae Mon Sep 17 00:00:00 2001
From: "A. Jiang" <de34 at live.cn>
Date: Fri, 1 Nov 2024 13:47:08 +0800
Subject: [PATCH 3/5] Missing inclusion and test skipping
---
libcxx/include/__iterator/const_iterator.h | 2 +
libcxx/include/__ranges/access.h | 1 +
libcxx/include/__ranges/as_const_view.h | 3 ++
.../views/views.span/span.cons/copy.pass.cpp | 8 +++-
.../views/views.span/span.cons/span.pass.cpp | 14 +++++-
.../views/views.span/types.pass.cpp | 47 +++++++++++--------
6 files changed, 52 insertions(+), 23 deletions(-)
diff --git a/libcxx/include/__iterator/const_iterator.h b/libcxx/include/__iterator/const_iterator.h
index 4fcd76b4117dc6..b98d27fb7c7698 100644
--- a/libcxx/include/__iterator/const_iterator.h
+++ b/libcxx/include/__iterator/const_iterator.h
@@ -12,6 +12,7 @@
#include <__compare/three_way_comparable.h>
#include <__concepts/common_with.h>
+#include <__concepts/constructible.h>
#include <__concepts/convertible_to.h>
#include <__concepts/different_from.h>
#include <__concepts/same_as.h>
@@ -29,6 +30,7 @@
#include <__type_traits/integral_constant.h>
#include <__type_traits/is_reference.h>
#include <__type_traits/is_specialization.h>
+#include <__type_traits/remove_cvref.h>
#include <__utility/forward.h>
#include <__utility/move.h>
diff --git a/libcxx/include/__ranges/access.h b/libcxx/include/__ranges/access.h
index e71e5ce8f9eeb9..777db55d38f172 100644
--- a/libcxx/include/__ranges/access.h
+++ b/libcxx/include/__ranges/access.h
@@ -18,6 +18,7 @@
#include <__memory/pointer_traits.h>
#include <__ranges/enable_borrowed_range.h>
#include <__type_traits/decay.h>
+#include <__type_traits/is_object.h>
#include <__type_traits/is_pointer.h>
#include <__type_traits/is_reference.h>
#include <__type_traits/remove_cvref.h>
diff --git a/libcxx/include/__ranges/as_const_view.h b/libcxx/include/__ranges/as_const_view.h
index d2613ad939fd0d..d991f4641e532d 100644
--- a/libcxx/include/__ranges/as_const_view.h
+++ b/libcxx/include/__ranges/as_const_view.h
@@ -20,8 +20,11 @@
#include <__ranges/ref_view.h>
#include <__ranges/size.h>
#include <__ranges/view_interface.h>
+#include <__type_traits/is_reference.h>
#include <__type_traits/is_specialization.h>
#include <__utility/auto_cast.h>
+#include <__utility/declval.h>
+#include <__utility/forward.h>
#include <__utility/move.h>
#include <__utility/pair.h>
#include <cstddef>
diff --git a/libcxx/test/std/containers/views/views.span/span.cons/copy.pass.cpp b/libcxx/test/std/containers/views/views.span/span.cons/copy.pass.cpp
index d3990fd60a459a..3780e239a2207d 100644
--- a/libcxx/test/std/containers/views/views.span/span.cons/copy.pass.cpp
+++ b/libcxx/test/std/containers/views/views.span/span.cons/copy.pass.cpp
@@ -87,14 +87,17 @@ constexpr bool test_all() {
test<volatile double>();
test<const volatile double>();
- // Note: Can't test non-fundamental types with volatile because we require `T*` to be indirectly_readable,
- // which isn't the case when T is volatile.
+ // Note: Can't test class types with volatile because we require `T*` to be indirectly_readable,
+ // which isn't the case when T is volatile. See also LWG3813.
test<Foo>();
test<const Foo>();
test<std::string>();
test<const std::string>();
+#if defined(_LIBCPP_VERSION) && TEST_STD_VER < 23
+ // libc++ supports span<Incomplete> as an extension in C++20 mode,
+ // but the extension is incompatible with changes of span in C++23.
// Regression test for https://github.com/llvm/llvm-project/issues/104496
{
struct Incomplete;
@@ -103,6 +106,7 @@ constexpr bool test_all() {
assert(copy.data() == x.data());
assert(copy.size() == x.size());
}
+#endif
return true;
}
diff --git a/libcxx/test/std/containers/views/views.span/span.cons/span.pass.cpp b/libcxx/test/std/containers/views/views.span/span.cons/span.pass.cpp
index a1ac0dd11b2d1a..526b7384835144 100644
--- a/libcxx/test/std/containers/views/views.span/span.cons/span.pass.cpp
+++ b/libcxx/test/std/containers/views/views.span/span.cons/span.pass.cpp
@@ -87,11 +87,16 @@ TEST_CONSTEXPR_CXX20 void check() {
}
template <class T>
-TEST_CONSTEXPR_CXX20 void check_cvs() {
+constexpr void check_non_volatile() {
check<T, T>();
check<T const, T>();
check<T const, T const>();
+}
+
+template <class T>
+constexpr void check_cvs() {
+ check_non_volatile<T>();
check<T volatile, T>();
check<T volatile, T volatile>();
@@ -104,12 +109,17 @@ TEST_CONSTEXPR_CXX20 void check_cvs() {
struct A {};
-TEST_CONSTEXPR_CXX20 bool test() {
+constexpr bool test() {
check_cvs<int>();
check_cvs<long>();
check_cvs<double>();
+#if TEST_STD_VER >= 23 // LWG3813: span<volatile class> is generally unsupported since C++23.
+ check_non_volatile<std::string>();
+ check_non_volatile<A>();
+#else
check_cvs<std::string>();
check_cvs<A>();
+#endif
return true;
}
diff --git a/libcxx/test/std/containers/views/views.span/types.pass.cpp b/libcxx/test/std/containers/views/views.span/types.pass.cpp
index be17884dae2955..f3e0f64c93e94e 100644
--- a/libcxx/test/std/containers/views/views.span/types.pass.cpp
+++ b/libcxx/test/std/containers/views/views.span/types.pass.cpp
@@ -66,30 +66,39 @@ void testSpan()
testIterator<S, typename S::reverse_iterator>();
}
+template <typename T>
+void test_non_volatile() {
+ testSpan<std::span<T>, T, std::dynamic_extent>();
+ testSpan<std::span<const T>, const T, std::dynamic_extent>();
+
+ testSpan<std::span<T, 5>, T, 5>();
+ testSpan<std::span<const T, 5>, const T, 5>();
+}
template <typename T>
-void test()
-{
- testSpan<std::span< T>, T, std::dynamic_extent>();
- testSpan<std::span<const T>, const T, std::dynamic_extent>();
- testSpan<std::span< volatile T>, volatile T, std::dynamic_extent>();
- testSpan<std::span<const volatile T>, const volatile T, std::dynamic_extent>();
-
- testSpan<std::span< T, 5>, T, 5>();
- testSpan<std::span<const T, 5>, const T, 5>();
- testSpan<std::span< volatile T, 5>, volatile T, 5>();
- testSpan<std::span<const volatile T, 5>, const volatile T, 5>();
+void test() {
+ test_non_volatile<T>();
+
+ testSpan<std::span<volatile T>, volatile T, std::dynamic_extent>();
+ testSpan<std::span<const volatile T>, const volatile T, std::dynamic_extent>();
+
+ testSpan<std::span<volatile T, 5>, volatile T, 5>();
+ testSpan<std::span<const volatile T, 5>, const volatile T, 5>();
}
-struct A{};
+struct A {};
-int main(int, char**)
-{
- test<int>();
- test<long>();
- test<double>();
- test<std::string>();
- test<A>();
+int main(int, char**) {
+ test<int>();
+ test<long>();
+ test<double>();
+#if TEST_STD_VER >= 23 // LWG3813: span<volatile class> is generally unsupported since C++23.
+ test_non_volatile<std::string>();
+ test_non_volatile<A>();
+#else
+ test<std::string>();
+ test<A>();
+#endif
return 0;
}
>From 40e7a25bb38954779756bdde3dd26f8c7085a1d3 Mon Sep 17 00:00:00 2001
From: "A. Jiang" <de34 at live.cn>
Date: Fri, 1 Nov 2024 14:10:27 +0800
Subject: [PATCH 4/5] Transitive inclusions and forward declaration of `span`
---
libcxx/include/__ranges/as_const_view.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/libcxx/include/__ranges/as_const_view.h b/libcxx/include/__ranges/as_const_view.h
index d991f4641e532d..3c520447b7224c 100644
--- a/libcxx/include/__ranges/as_const_view.h
+++ b/libcxx/include/__ranges/as_const_view.h
@@ -11,6 +11,8 @@
#define _LIBCPP___RANGES_AS_CONST_VIEW_H
#include <__concepts/constructible.h>
+#include <__cstddef/size_t.h>
+#include <__fwd/span.h>
#include <__iterator/concepts.h>
#include <__ranges/all.h>
#include <__ranges/concepts.h>
@@ -22,13 +24,12 @@
#include <__ranges/view_interface.h>
#include <__type_traits/is_reference.h>
#include <__type_traits/is_specialization.h>
+#include <__type_traits/remove_cvref.h>
#include <__utility/auto_cast.h>
#include <__utility/declval.h>
#include <__utility/forward.h>
#include <__utility/move.h>
#include <__utility/pair.h>
-#include <cstddef>
-#include <span>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
>From 8b50c880419e2b7f259326e5df9303d3f03b867f Mon Sep 17 00:00:00 2001
From: "A. Jiang" <de34 at live.cn>
Date: Fri, 1 Nov 2024 14:18:11 +0800
Subject: [PATCH 5/5] Missing inclusion of `<__ranges/enable_borrowed_range.h>`
---
libcxx/include/__ranges/as_const_view.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/libcxx/include/__ranges/as_const_view.h b/libcxx/include/__ranges/as_const_view.h
index 3c520447b7224c..a750c9f36f134a 100644
--- a/libcxx/include/__ranges/as_const_view.h
+++ b/libcxx/include/__ranges/as_const_view.h
@@ -18,6 +18,7 @@
#include <__ranges/concepts.h>
#include <__ranges/const_access.h>
#include <__ranges/empty_view.h>
+#include <__ranges/enable_borrowed_range.h>
#include <__ranges/range_adaptor.h>
#include <__ranges/ref_view.h>
#include <__ranges/size.h>
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