[libcxx-commits] [mlir] [clang-tools-extra] [libc] [libcxx] [clang] [llvm] [libc++][span] P2821R5: span.at() (PR #74994)
Hristo Hristov via libcxx-commits
libcxx-commits at lists.llvm.org
Mon Dec 11 00:32:55 PST 2023
https://github.com/H-G-Hristov updated https://github.com/llvm/llvm-project/pull/74994
>From 6e26ca239c49e1b7d9ab72217db7339e92df163f Mon Sep 17 00:00:00 2001
From: Zingam <zingam at outlook.com>
Date: Sun, 10 Dec 2023 14:16:02 +0200
Subject: [PATCH 1/9] [libc++][span] P2821R5: span.at()
---
libcxx/include/span | 30 +++
.../views/views.span/span.elem/at.pass.cpp | 246 ++++++++++++++++++
.../views.span/span.elem/op_idx.pass.cpp | 1 -
3 files changed, 276 insertions(+), 1 deletion(-)
create mode 100644 libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
diff --git a/libcxx/include/span b/libcxx/include/span
index 69b0a2875e26cc..b015d7cf1c15b6 100644
--- a/libcxx/include/span
+++ b/libcxx/include/span
@@ -92,6 +92,7 @@ public:
// [span.elem], span element access
constexpr reference operator[](size_type idx) const;
+ constexpr reference at(size_type idx) const; // since C++26
constexpr reference front() const;
constexpr reference back() const;
constexpr pointer data() const noexcept;
@@ -146,6 +147,9 @@ template<class R>
#include <__utility/forward.h>
#include <array> // for array
#include <cstddef> // for byte
+#if _LIBCPP_STD_VER >= 26
+# include <stdexcept>
+#endif
#include <version>
// standard-mandated includes
@@ -343,6 +347,15 @@ public:
return __data_[__idx];
}
+# if _LIBCPP_STD_VER >= 26
+ _LIBCPP_HIDE_FROM_ABI constexpr reference at(size_type __idx) const {
+ if (__idx >= size()) {
+ __throw_out_of_range();
+ }
+ return *(data() + __idx);
+ }
+# endif
+
_LIBCPP_INLINE_VISIBILITY constexpr reference front() const noexcept
{
_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "span<T, N>::front() on empty span");
@@ -383,6 +396,10 @@ public:
private:
pointer __data_;
+
+# if _LIBCPP_STD_VER >= 26
+ _LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range() const { std::__throw_out_of_range("span"); }
+# endif
};
@@ -510,6 +527,15 @@ public:
return __data_[__idx];
}
+# if _LIBCPP_STD_VER >= 26
+ _LIBCPP_HIDE_FROM_ABI constexpr reference at(size_type __idx) const {
+ if (__idx >= size()) {
+ __throw_out_of_range();
+ }
+ return *(data() + __idx);
+ }
+# endif
+
_LIBCPP_INLINE_VISIBILITY constexpr reference front() const noexcept
{
_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "span<T>::front() on empty span");
@@ -552,6 +578,10 @@ public:
private:
pointer __data_;
size_type __size_;
+
+# if _LIBCPP_STD_VER >= 26
+ _LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range() const { std::__throw_out_of_range("span"); }
+# endif
};
template <class _Tp, size_t _Extent>
diff --git a/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp b/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
new file mode 100644
index 00000000000000..2a9ce2baeec1a5
--- /dev/null
+++ b/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
@@ -0,0 +1,246 @@
+//===----------------------------------------------------------------------===//
+//
+// 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, c++23
+
+// <span>
+
+// constexpr reference at(size_type idx) const; // since C++26
+
+#include <array>
+#include <cassert>
+#include <concepts>
+#include <span>
+#include <stdexcept>
+#include <vector>
+
+#include "test_macros.h"
+
+// template <typename Span>
+// constexpr bool testConstexprSpan(Span sp, std::size_t idx)
+// {
+// LIBCPP_ASSERT(noexcept(sp[idx]));
+
+// typename Span::reference r1 = sp[idx];
+// typename Span::reference r2 = *(sp.data() + idx);
+
+// return r1 == r2;
+// }
+
+// template <typename Span>
+// void testRuntimeSpan(Span sp, std::size_t idx)
+// {
+// LIBCPP_ASSERT(noexcept(sp[idx]));
+
+// typename Span::reference r1 = sp[idx];
+// typename Span::reference r2 = *(sp.data() + idx);
+
+// assert(r1 == r2);
+// }
+
+// struct A{};
+// 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<const int>(iArr1, 1), 0), "");
+
+// static_assert(testConstexprSpan(std::span<const int>(iArr1, 2), 0), "");
+// static_assert(testConstexprSpan(std::span<const int>(iArr1, 2), 1), "");
+
+// static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), 0), "");
+// static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), 1), "");
+// static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), 2), "");
+
+// static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 0), "");
+// static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 1), "");
+// static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 2), "");
+// static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 3), "");
+
+// static_assert(testConstexprSpan(std::span<const int, 1>(iArr1, 1), 0), "");
+
+// static_assert(testConstexprSpan(std::span<const int, 2>(iArr1, 2), 0), "");
+// static_assert(testConstexprSpan(std::span<const int, 2>(iArr1, 2), 1), "");
+
+// static_assert(testConstexprSpan(std::span<const int, 3>(iArr1, 3), 0), "");
+// static_assert(testConstexprSpan(std::span<const int, 3>(iArr1, 3), 1), "");
+// static_assert(testConstexprSpan(std::span<const int, 3>(iArr1, 3), 2), "");
+
+// static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), 0), "");
+// static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), 1), "");
+// static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), 2), "");
+// static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), 3), "");
+
+// testRuntimeSpan(std::span<int>(iArr2, 1), 0);
+
+// testRuntimeSpan(std::span<int>(iArr2, 2), 0);
+// testRuntimeSpan(std::span<int>(iArr2, 2), 1);
+
+// testRuntimeSpan(std::span<int>(iArr2, 3), 0);
+// testRuntimeSpan(std::span<int>(iArr2, 3), 1);
+// testRuntimeSpan(std::span<int>(iArr2, 3), 2);
+
+// testRuntimeSpan(std::span<int>(iArr2, 4), 0);
+// testRuntimeSpan(std::span<int>(iArr2, 4), 1);
+// testRuntimeSpan(std::span<int>(iArr2, 4), 2);
+// testRuntimeSpan(std::span<int>(iArr2, 4), 3);
+
+// testRuntimeSpan(std::span<int, 1>(iArr2, 1), 0);
+
+// testRuntimeSpan(std::span<int, 2>(iArr2, 2), 0);
+// testRuntimeSpan(std::span<int, 2>(iArr2, 2), 1);
+
+// testRuntimeSpan(std::span<int, 3>(iArr2, 3), 0);
+// testRuntimeSpan(std::span<int, 3>(iArr2, 3), 1);
+// testRuntimeSpan(std::span<int, 3>(iArr2, 3), 2);
+
+// testRuntimeSpan(std::span<int, 4>(iArr2, 4), 0);
+// testRuntimeSpan(std::span<int, 4>(iArr2, 4), 1);
+// testRuntimeSpan(std::span<int, 4>(iArr2, 4), 2);
+// testRuntimeSpan(std::span<int, 4>(iArr2, 4), 3);
+
+// std::string s;
+// testRuntimeSpan(std::span<std::string> (&s, 1), 0);
+// testRuntimeSpan(std::span<std::string, 1>(&s, 1), 0);
+
+// return 0;
+// }
+
+constexpr bool test() {
+ // {
+ // typedef double T;
+ // typedef std::array<T, 3> C;
+ // C const c = {1, 2, 3.5};
+ // typename C::const_reference r1 = c.at(0);
+ // assert(r1 == 1);
+
+ // typename C::const_reference r2 = c.at(2);
+ // assert(r2 == 3.5);
+ // }
+
+ const auto testSpan =
+ [](auto span, int idx, int expectedValue) {
+ {
+ std::same_as<decltype(span)::reference> elem = span.at(idx);
+ assert(elem == expectedValue);
+ }
+
+ {
+ std::same_as<decltype(span)::const_reference> elem = std::as_const(span).at(idx);
+ assert(elem == expectedValue);
+ }
+ }
+
+ // With static extent
+
+ std::array arr{0, 1, 2, 3, 4, 5, 9084};
+ std::span arrSpan{ar};
+
+ assert(std::dynamic_extent != arrSpan.extent);
+
+ testSpan(arrSpan, 0, 0);
+ testSpan(arrSpan, 1, 1);
+ testSpan(arrSpan, 5, 9084);
+
+ {
+ std::same_as<decltype(arrSpan)::reference> arrElem = arrSpan.at(1);
+ assert(arrElem == 1);
+ }
+
+ {
+ std::same_as<decltype(arrSpan)::const_reference> arrElem = std::as_const(arrSpan).at(1);
+ assert(arrElem == 1);
+ }
+
+ // With dynamic extent
+
+ std::vector vec{0, 1, 2, 3, 4, 5};
+ std::span vecSpan{vec};
+
+ assert(std::dynamic_extent == vecSpan.extent)
+
+ {
+ std::same_as<decltype(vecSpan)::reference> vecElem = vecSpan.at(1);
+ assert(vec_elem == 1);
+ }
+
+ {
+ std::same_as<decltype(vecSpan)::reference> vecElem = std::as_const(vecSpan).at(1);
+ assert(vec_elem == 1);
+ }
+
+ return true;
+}
+
+void test_exceptions() {
+#ifndef TEST_HAS_NO_EXCEPTIONS
+ // With static extent
+ {
+ const std::array arr{1, 2, 3, 4};
+
+ try {
+ TEST_IGNORE_NODISCARD arr.at(4);
+ assert(false);
+ } catch (std::out_of_range const&) {
+ // pass
+ } catch (...) {
+ assert(false);
+ }
+ }
+
+ {
+ const std::array<int, 0> arr{};
+
+ try {
+ TEST_IGNORE_NODISCARD arr.at(0);
+ assert(false);
+ } catch (std::out_of_range const&) {
+ // pass
+ } catch (...) {
+ assert(false);
+ }
+ }
+
+ // With dynamic extent
+
+ {
+ const std::vector vec{1, 2, 3, 4};
+
+ try {
+ TEST_IGNORE_NODISCARD vec.at(4);
+ assert(false);
+ } catch (std::out_of_range const&) {
+ // pass
+ } catch (...) {
+ assert(false);
+ }
+ }
+
+ {
+ const std::vector<int> vec{};
+
+ try {
+ TEST_IGNORE_NODISCARD vec.at(0);
+ assert(false);
+ } catch (std::out_of_range const&) {
+ // pass
+ } catch (...) {
+ assert(false);
+ }
+ }
+#endif
+}
+
+int main(int, char**) {
+ test();
+ test_exceptions();
+ static_assert(test());
+
+ return 0;
+}
\ No newline at end of file
diff --git a/libcxx/test/std/containers/views/views.span/span.elem/op_idx.pass.cpp b/libcxx/test/std/containers/views/views.span/span.elem/op_idx.pass.cpp
index e46fd267ef5cc5..b7f36c57585881 100644
--- a/libcxx/test/std/containers/views/views.span/span.elem/op_idx.pass.cpp
+++ b/libcxx/test/std/containers/views/views.span/span.elem/op_idx.pass.cpp
@@ -41,7 +41,6 @@ void testRuntimeSpan(Span sp, std::size_t idx)
assert(r1 == r2);
}
-struct A{};
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};
>From ed7ee83fa9b10a37295d050e1edc538b05a22504 Mon Sep 17 00:00:00 2001
From: Zingam <zingam at outlook.com>
Date: Sun, 10 Dec 2023 16:03:08 +0200
Subject: [PATCH 2/9] Cleanup tests
---
libcxx/docs/ReleaseNotes/18.rst | 1 +
libcxx/docs/Status/Cxx2cPapers.csv | 2 +-
.../views/views.span/span.elem/at.pass.cpp | 139 ++----------------
z_libcxx-dev-tools | 1 +
4 files changed, 18 insertions(+), 125 deletions(-)
create mode 160000 z_libcxx-dev-tools
diff --git a/libcxx/docs/ReleaseNotes/18.rst b/libcxx/docs/ReleaseNotes/18.rst
index abefe4c28ca958..05542f034e63b4 100644
--- a/libcxx/docs/ReleaseNotes/18.rst
+++ b/libcxx/docs/ReleaseNotes/18.rst
@@ -54,6 +54,7 @@ Implemented Papers
- P2871R3 - Remove Deprecated Unicode Conversion Facets from C++26
- P2870R3 - Remove basic_string::reserve()
- P2909R4 - Fix formatting of code units as integers (Dude, where’s my ``char``?)
+- P2821R5 - span.at()
Improvements and New Features
diff --git a/libcxx/docs/Status/Cxx2cPapers.csv b/libcxx/docs/Status/Cxx2cPapers.csv
index 1d071b7ebcb4a7..b97dc44795ac82 100644
--- a/libcxx/docs/Status/Cxx2cPapers.csv
+++ b/libcxx/docs/Status/Cxx2cPapers.csv
@@ -35,7 +35,7 @@
"`P2909R4 <https://wg21.link/P2909R4>`__","LWG","Fix formatting of code units as integers (Dude, where’s my ``char``?)","Kona November 2023","|Complete|","18.0","|format| |DR|"
"`P0952R2 <https://wg21.link/P0952R2>`__","LWG","A new specification for ``std::generate_canonical``","Kona November 2023","","",""
"`P2447R6 <https://wg21.link/P2447R6>`__","LWG","``std::span`` over an initializer list","Kona November 2023","","",""
-"`P2821R5 <https://wg21.link/P2821R5>`__","LWG","``span.at()``","Kona November 2023","","",""
+"`P2821R5 <https://wg21.link/P2821R5>`__","LWG","``span.at()``","Kona November 2023","|Complete|","18.0",""
"`P2868R3 <https://wg21.link/P2868R3>`__","LWG","Remove Deprecated ``std::allocator`` Typedef From C++26","Kona November 2023","","",""
"`P2870R3 <https://wg21.link/P2870R3>`__","LWG","Remove ``basic_string::reserve()`` From C++26","Kona November 2023","|Complete|","18.0",""
"`P2871R3 <https://wg21.link/P2871R3>`__","LWG","Remove Deprecated Unicode Conversion Facets from C++26","Kona November 2023","|Complete|","18.0",""
diff --git a/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp b/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
index 2a9ce2baeec1a5..8daaa6bb6fa127 100644
--- a/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
+++ b/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
@@ -17,144 +17,35 @@
#include <concepts>
#include <span>
#include <stdexcept>
+#include <utility>
#include <vector>
#include "test_macros.h"
-// template <typename Span>
-// constexpr bool testConstexprSpan(Span sp, std::size_t idx)
-// {
-// LIBCPP_ASSERT(noexcept(sp[idx]));
-
-// typename Span::reference r1 = sp[idx];
-// typename Span::reference r2 = *(sp.data() + idx);
-
-// return r1 == r2;
-// }
-
-// template <typename Span>
-// void testRuntimeSpan(Span sp, std::size_t idx)
-// {
-// LIBCPP_ASSERT(noexcept(sp[idx]));
-
-// typename Span::reference r1 = sp[idx];
-// typename Span::reference r2 = *(sp.data() + idx);
-
-// assert(r1 == r2);
-// }
-
-// struct A{};
-// 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<const int>(iArr1, 1), 0), "");
-
-// static_assert(testConstexprSpan(std::span<const int>(iArr1, 2), 0), "");
-// static_assert(testConstexprSpan(std::span<const int>(iArr1, 2), 1), "");
-
-// static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), 0), "");
-// static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), 1), "");
-// static_assert(testConstexprSpan(std::span<const int>(iArr1, 3), 2), "");
-
-// static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 0), "");
-// static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 1), "");
-// static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 2), "");
-// static_assert(testConstexprSpan(std::span<const int>(iArr1, 4), 3), "");
-
-// static_assert(testConstexprSpan(std::span<const int, 1>(iArr1, 1), 0), "");
-
-// static_assert(testConstexprSpan(std::span<const int, 2>(iArr1, 2), 0), "");
-// static_assert(testConstexprSpan(std::span<const int, 2>(iArr1, 2), 1), "");
-
-// static_assert(testConstexprSpan(std::span<const int, 3>(iArr1, 3), 0), "");
-// static_assert(testConstexprSpan(std::span<const int, 3>(iArr1, 3), 1), "");
-// static_assert(testConstexprSpan(std::span<const int, 3>(iArr1, 3), 2), "");
-
-// static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), 0), "");
-// static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), 1), "");
-// static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), 2), "");
-// static_assert(testConstexprSpan(std::span<const int, 4>(iArr1, 4), 3), "");
-
-// testRuntimeSpan(std::span<int>(iArr2, 1), 0);
-
-// testRuntimeSpan(std::span<int>(iArr2, 2), 0);
-// testRuntimeSpan(std::span<int>(iArr2, 2), 1);
-
-// testRuntimeSpan(std::span<int>(iArr2, 3), 0);
-// testRuntimeSpan(std::span<int>(iArr2, 3), 1);
-// testRuntimeSpan(std::span<int>(iArr2, 3), 2);
-
-// testRuntimeSpan(std::span<int>(iArr2, 4), 0);
-// testRuntimeSpan(std::span<int>(iArr2, 4), 1);
-// testRuntimeSpan(std::span<int>(iArr2, 4), 2);
-// testRuntimeSpan(std::span<int>(iArr2, 4), 3);
-
-// testRuntimeSpan(std::span<int, 1>(iArr2, 1), 0);
-
-// testRuntimeSpan(std::span<int, 2>(iArr2, 2), 0);
-// testRuntimeSpan(std::span<int, 2>(iArr2, 2), 1);
-
-// testRuntimeSpan(std::span<int, 3>(iArr2, 3), 0);
-// testRuntimeSpan(std::span<int, 3>(iArr2, 3), 1);
-// testRuntimeSpan(std::span<int, 3>(iArr2, 3), 2);
-
-// testRuntimeSpan(std::span<int, 4>(iArr2, 4), 0);
-// testRuntimeSpan(std::span<int, 4>(iArr2, 4), 1);
-// testRuntimeSpan(std::span<int, 4>(iArr2, 4), 2);
-// testRuntimeSpan(std::span<int, 4>(iArr2, 4), 3);
-
-// std::string s;
-// testRuntimeSpan(std::span<std::string> (&s, 1), 0);
-// testRuntimeSpan(std::span<std::string, 1>(&s, 1), 0);
-
-// return 0;
-// }
+constexpr void testSpan(auto span, int idx, int expectedValue) {
+ std::same_as<typename decltype(span)::reference> decltype(auto) elem = span.at(idx);
+ assert(elem == expectedValue);
+}
constexpr bool test() {
- // {
- // typedef double T;
- // typedef std::array<T, 3> C;
- // C const c = {1, 2, 3.5};
- // typename C::const_reference r1 = c.at(0);
- // assert(r1 == 1);
-
- // typename C::const_reference r2 = c.at(2);
- // assert(r2 == 3.5);
- // }
-
- const auto testSpan =
- [](auto span, int idx, int expectedValue) {
- {
- std::same_as<decltype(span)::reference> elem = span.at(idx);
- assert(elem == expectedValue);
- }
-
- {
- std::same_as<decltype(span)::const_reference> elem = std::as_const(span).at(idx);
- assert(elem == expectedValue);
- }
- }
-
// With static extent
std::array arr{0, 1, 2, 3, 4, 5, 9084};
- std::span arrSpan{ar};
+ std::span arrSpan{arr};
assert(std::dynamic_extent != arrSpan.extent);
testSpan(arrSpan, 0, 0);
testSpan(arrSpan, 1, 1);
- testSpan(arrSpan, 5, 9084);
+ testSpan(arrSpan, 6, 9084);
{
- std::same_as<decltype(arrSpan)::reference> arrElem = arrSpan.at(1);
+ std::same_as<typename decltype(arrSpan)::reference> decltype(auto) arrElem = arrSpan.at(1);
assert(arrElem == 1);
}
{
- std::same_as<decltype(arrSpan)::const_reference> arrElem = std::as_const(arrSpan).at(1);
+ std::same_as<typename decltype(arrSpan)::reference> decltype(auto) arrElem = std::as_const(arrSpan).at(1);
assert(arrElem == 1);
}
@@ -162,17 +53,17 @@ constexpr bool test() {
std::vector vec{0, 1, 2, 3, 4, 5};
std::span vecSpan{vec};
-
- assert(std::dynamic_extent == vecSpan.extent)
+
+ assert(std::dynamic_extent == vecSpan.extent);
{
- std::same_as<decltype(vecSpan)::reference> vecElem = vecSpan.at(1);
- assert(vec_elem == 1);
+ std::same_as<typename decltype(vecSpan)::reference> decltype(auto) vecElem = vecSpan.at(1);
+ assert(vecElem == 1);
}
{
- std::same_as<decltype(vecSpan)::reference> vecElem = std::as_const(vecSpan).at(1);
- assert(vec_elem == 1);
+ std::same_as<typename decltype(vecSpan)::reference> decltype(auto) vecElem = std::as_const(vecSpan).at(1);
+ assert(vecElem == 1);
}
return true;
diff --git a/z_libcxx-dev-tools b/z_libcxx-dev-tools
new file mode 160000
index 00000000000000..229818e01844e2
--- /dev/null
+++ b/z_libcxx-dev-tools
@@ -0,0 +1 @@
+Subproject commit 229818e01844e2cad56818bf06703600071848c0
>From f02f8a0e8667fec1e5b5e16a13a9b5e52c52e58d Mon Sep 17 00:00:00 2001
From: Zingam <zingam at outlook.com>
Date: Sun, 10 Dec 2023 18:25:42 +0200
Subject: [PATCH 3/9] Removed bad file
---
z_libcxx-dev-tools | 1 -
1 file changed, 1 deletion(-)
delete mode 160000 z_libcxx-dev-tools
diff --git a/z_libcxx-dev-tools b/z_libcxx-dev-tools
deleted file mode 160000
index 229818e01844e2..00000000000000
--- a/z_libcxx-dev-tools
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 229818e01844e2cad56818bf06703600071848c0
>From e8e8457304f87e4780144fe3bc3bf918c335b726 Mon Sep 17 00:00:00 2001
From: Zingam <zingam at outlook.com>
Date: Sun, 10 Dec 2023 18:31:46 +0200
Subject: [PATCH 4/9] Fixed test_exceptions
---
.../views/views.span/span.elem/at.pass.cpp | 18 +++++++++++-------
1 file changed, 11 insertions(+), 7 deletions(-)
diff --git a/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp b/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
index 8daaa6bb6fa127..68c2fca62a67cf 100644
--- a/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
+++ b/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
@@ -73,10 +73,11 @@ void test_exceptions() {
#ifndef TEST_HAS_NO_EXCEPTIONS
// With static extent
{
- const std::array arr{1, 2, 3, 4};
+ std::array arr{1, 2, 3, 4};
+ const std::span arrSpan{arr};
try {
- TEST_IGNORE_NODISCARD arr.at(4);
+ TEST_IGNORE_NODISCARD arrSpan.at(4);
assert(false);
} catch (std::out_of_range const&) {
// pass
@@ -86,10 +87,11 @@ void test_exceptions() {
}
{
- const std::array<int, 0> arr{};
+ std::array<int, 0> arr{};
+ const std::span arrSpan{arr};
try {
- TEST_IGNORE_NODISCARD arr.at(0);
+ TEST_IGNORE_NODISCARD arrSpan.at(0);
assert(false);
} catch (std::out_of_range const&) {
// pass
@@ -101,7 +103,8 @@ void test_exceptions() {
// With dynamic extent
{
- const std::vector vec{1, 2, 3, 4};
+ std::vector vec{1, 2, 3, 4};
+ const std::span vecSpan{vec};
try {
TEST_IGNORE_NODISCARD vec.at(4);
@@ -114,7 +117,8 @@ void test_exceptions() {
}
{
- const std::vector<int> vec{};
+ std::vector<int> vec{};
+ const std::span vecSpan{vec};
try {
TEST_IGNORE_NODISCARD vec.at(0);
@@ -134,4 +138,4 @@ int main(int, char**) {
static_assert(test());
return 0;
-}
\ No newline at end of file
+}
>From 9340bc0c3be951e6431926ebb8c7f3a5f71a7d1c Mon Sep 17 00:00:00 2001
From: Zingam <zingam at outlook.com>
Date: Sun, 10 Dec 2023 19:12:42 +0200
Subject: [PATCH 5/9] Fixed tests
---
.../views/views.span/span.elem/at.pass.cpp | 43 ++++++++-----------
1 file changed, 18 insertions(+), 25 deletions(-)
diff --git a/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp b/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
index 68c2fca62a67cf..f3d6fbd9fb28aa 100644
--- a/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
+++ b/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
@@ -23,8 +23,17 @@
#include "test_macros.h"
constexpr void testSpan(auto span, int idx, int expectedValue) {
- std::same_as<typename decltype(span)::reference> decltype(auto) elem = span.at(idx);
- assert(elem == expectedValue);
+ // non-const
+ {
+ std::same_as<typename decltype(span)::reference> decltype(auto) elem = span.at(idx);
+ assert(elem == expectedValue);
+ }
+
+ // const
+ {
+ std::same_as<typename decltype(span)::reference> decltype(auto) elem = std::as_const(span).at(idx);
+ assert(elem == expectedValue);
+ }
}
constexpr bool test() {
@@ -39,32 +48,16 @@ constexpr bool test() {
testSpan(arrSpan, 1, 1);
testSpan(arrSpan, 6, 9084);
- {
- std::same_as<typename decltype(arrSpan)::reference> decltype(auto) arrElem = arrSpan.at(1);
- assert(arrElem == 1);
- }
-
- {
- std::same_as<typename decltype(arrSpan)::reference> decltype(auto) arrElem = std::as_const(arrSpan).at(1);
- assert(arrElem == 1);
- }
-
// With dynamic extent
- std::vector vec{0, 1, 2, 3, 4, 5};
+ std::vector vec{0, 1, 2, 3, 4, 5, 9084};
std::span vecSpan{vec};
assert(std::dynamic_extent == vecSpan.extent);
- {
- std::same_as<typename decltype(vecSpan)::reference> decltype(auto) vecElem = vecSpan.at(1);
- assert(vecElem == 1);
- }
-
- {
- std::same_as<typename decltype(vecSpan)::reference> decltype(auto) vecElem = std::as_const(vecSpan).at(1);
- assert(vecElem == 1);
- }
+ testSpan(vecSpan, 0, 0);
+ testSpan(vecSpan, 1, 1);
+ testSpan(vecSpan, 6, 9084);
return true;
}
@@ -77,7 +70,7 @@ void test_exceptions() {
const std::span arrSpan{arr};
try {
- TEST_IGNORE_NODISCARD arrSpan.at(4);
+ TEST_IGNORE_NODISCARD arrSpan.at(arr.size() + 1);
assert(false);
} catch (std::out_of_range const&) {
// pass
@@ -107,7 +100,7 @@ void test_exceptions() {
const std::span vecSpan{vec};
try {
- TEST_IGNORE_NODISCARD vec.at(4);
+ TEST_IGNORE_NODISCARD vecSpan.at(vec.size() + 1);
assert(false);
} catch (std::out_of_range const&) {
// pass
@@ -121,7 +114,7 @@ void test_exceptions() {
const std::span vecSpan{vec};
try {
- TEST_IGNORE_NODISCARD vec.at(0);
+ TEST_IGNORE_NODISCARD vecSpan.at(0);
assert(false);
} catch (std::out_of_range const&) {
// pass
>From 431b502a10e9e60462a05de37db3e55cc0ff1e7e Mon Sep 17 00:00:00 2001
From: Zingam <zingam at outlook.com>
Date: Sun, 10 Dec 2023 19:19:00 +0200
Subject: [PATCH 6/9] Minor tweaks
---
.../views/views.span/span.elem/at.pass.cpp | 34 ++++++++++---------
1 file changed, 18 insertions(+), 16 deletions(-)
diff --git a/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp b/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
index f3d6fbd9fb28aa..75a45171185cf3 100644
--- a/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
+++ b/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
@@ -22,7 +22,7 @@
#include "test_macros.h"
-constexpr void testSpan(auto span, int idx, int expectedValue) {
+constexpr void testSpanAt(auto span, int idx, int expectedValue) {
// non-const
{
std::same_as<typename decltype(span)::reference> decltype(auto) elem = span.at(idx);
@@ -38,26 +38,28 @@ constexpr void testSpan(auto span, int idx, int expectedValue) {
constexpr bool test() {
// With static extent
+ {
+ std::array arr{0, 1, 2, 3, 4, 5, 9084};
+ std::span arrSpan{arr};
- std::array arr{0, 1, 2, 3, 4, 5, 9084};
- std::span arrSpan{arr};
-
- assert(std::dynamic_extent != arrSpan.extent);
+ assert(std::dynamic_extent != arrSpan.extent);
- testSpan(arrSpan, 0, 0);
- testSpan(arrSpan, 1, 1);
- testSpan(arrSpan, 6, 9084);
+ testSpanAt(arrSpan, 0, 0);
+ testSpanAt(arrSpan, 1, 1);
+ testSpanAt(arrSpan, 6, 9084);
+ }
// With dynamic extent
+ {
+ std::vector vec{0, 1, 2, 3, 4, 5, 9084};
+ std::span vecSpan{vec};
- std::vector vec{0, 1, 2, 3, 4, 5, 9084};
- std::span vecSpan{vec};
-
- assert(std::dynamic_extent == vecSpan.extent);
+ assert(std::dynamic_extent == vecSpan.extent);
- testSpan(vecSpan, 0, 0);
- testSpan(vecSpan, 1, 1);
- testSpan(vecSpan, 6, 9084);
+ testSpanAt(vecSpan, 0, 0);
+ testSpanAt(vecSpan, 1, 1);
+ testSpanAt(vecSpan, 6, 9084);
+ }
return true;
}
@@ -122,7 +124,7 @@ void test_exceptions() {
assert(false);
}
}
-#endif
+#endif // TEST_HAS_NO_EXCEPTIONS
}
int main(int, char**) {
>From 2f52b03bcec7ca93f042be69550659e71098b029 Mon Sep 17 00:00:00 2001
From: Zingam <zingam at outlook.com>
Date: Sun, 10 Dec 2023 22:44:28 +0200
Subject: [PATCH 7/9] Adressed review comments
---
libcxx/docs/FeatureTestMacroTable.rst | 2 +
libcxx/include/span | 28 +++-----
libcxx/include/version | 2 +
.../views/views.span/span.elem/at.pass.cpp | 70 +++++++++++--------
.../span.version.compile.pass.cpp | 28 ++++++++
.../version.version.compile.pass.cpp | 28 ++++++++
.../generate_feature_test_macro_components.py | 5 ++
z_libcxx-dev-tools | 1 +
8 files changed, 117 insertions(+), 47 deletions(-)
create mode 160000 z_libcxx-dev-tools
diff --git a/libcxx/docs/FeatureTestMacroTable.rst b/libcxx/docs/FeatureTestMacroTable.rst
index d09f65b7cadc0e..75028841fbb7f2 100644
--- a/libcxx/docs/FeatureTestMacroTable.rst
+++ b/libcxx/docs/FeatureTestMacroTable.rst
@@ -436,6 +436,8 @@ Status
--------------------------------------------------- -----------------
``__cpp_lib_smart_ptr_owner_equality`` *unimplemented*
--------------------------------------------------- -----------------
+ ``__cpp_lib_span_at`` ``202311L``
+ --------------------------------------------------- -----------------
``__cpp_lib_span_initializer_list`` *unimplemented*
--------------------------------------------------- -----------------
``__cpp_lib_sstream_from_string_view`` *unimplemented*
diff --git a/libcxx/include/span b/libcxx/include/span
index 9af8dabb3ebd34..8c52b00e4ae967 100644
--- a/libcxx/include/span
+++ b/libcxx/include/span
@@ -147,9 +147,7 @@ template<class R>
#include <__utility/forward.h>
#include <array> // for array
#include <cstddef> // for byte
-#if _LIBCPP_STD_VER >= 26
-# include <stdexcept>
-#endif
+#include <stdexcept>
#include <version>
// standard-mandated includes
@@ -348,11 +346,11 @@ public:
}
# if _LIBCPP_STD_VER >= 26
- _LIBCPP_HIDE_FROM_ABI constexpr reference at(size_type __idx) const {
- if (__idx >= size()) {
- __throw_out_of_range();
+ _LIBCPP_HIDE_FROM_ABI constexpr reference at(size_type __index) const {
+ if (__index >= size()) {
+ std::__throw_out_of_range("span");
}
- return *(data() + __idx);
+ return __data_[__index];
}
# endif
@@ -396,10 +394,6 @@ public:
private:
pointer __data_;
-
-# if _LIBCPP_STD_VER >= 26
- _LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range() const { std::__throw_out_of_range("span"); }
-# endif
};
@@ -528,11 +522,11 @@ public:
}
# if _LIBCPP_STD_VER >= 26
- _LIBCPP_HIDE_FROM_ABI constexpr reference at(size_type __idx) const {
- if (__idx >= size()) {
- __throw_out_of_range();
+ _LIBCPP_HIDE_FROM_ABI constexpr reference at(size_type __index) const {
+ if (__index >= size()) {
+ std::__throw_out_of_range("span");
}
- return *(data() + __idx);
+ return __data_[__index];
}
# endif
@@ -578,10 +572,6 @@ public:
private:
pointer __data_;
size_type __size_;
-
-# if _LIBCPP_STD_VER >= 26
- _LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void __throw_out_of_range() const { std::__throw_out_of_range("span"); }
-# endif
};
template <class _Tp, size_t _Extent>
diff --git a/libcxx/include/version b/libcxx/include/version
index a91c344c436090..0c2cc09e54c763 100644
--- a/libcxx/include/version
+++ b/libcxx/include/version
@@ -201,6 +201,7 @@ __cpp_lib_smart_ptr_for_overwrite 202002L <memory>
__cpp_lib_smart_ptr_owner_equality 202306L <memory>
__cpp_lib_source_location 201907L <source_location>
__cpp_lib_span 202002L <span>
+__cpp_lib_span_at 202311L <span>
__cpp_lib_span_initializer_list 202311L <span>
__cpp_lib_spanstream 202106L <spanstream>
__cpp_lib_ssize 201902L <iterator>
@@ -505,6 +506,7 @@ __cpp_lib_within_lifetime 202306L <type_traits>
// # define __cpp_lib_rcu 202306L
// # define __cpp_lib_saturation_arithmetic 202311L
// # define __cpp_lib_smart_ptr_owner_equality 202306L
+# define __cpp_lib_span_at 202311L
// # define __cpp_lib_span_initializer_list 202311L
// # define __cpp_lib_sstream_from_string_view 202306L
// # define __cpp_lib_submdspan 202306L
diff --git a/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp b/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
index 75a45171185cf3..fb5519365ae93a 100644
--- a/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
+++ b/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
@@ -15,23 +15,34 @@
#include <array>
#include <cassert>
#include <concepts>
+#include <limits>
#include <span>
#include <stdexcept>
+#include <string>
#include <utility>
#include <vector>
+#include <iostream>
#include "test_macros.h"
-constexpr void testSpanAt(auto span, int idx, int expectedValue) {
+constexpr void testSpanAt(auto& container, bool hasDynamicExtent, int index, int expectedValue) {
+ std::span anySpan{container};
+
+ if (hasDynamicExtent) {
+ assert(std::dynamic_extent == anySpan.extent);
+ } else {
+ assert(std::dynamic_extent != anySpan.extent);
+ }
+
// non-const
{
- std::same_as<typename decltype(span)::reference> decltype(auto) elem = span.at(idx);
+ std::same_as<typename decltype(anySpan)::reference> decltype(auto) elem = anySpan.at(index);
assert(elem == expectedValue);
}
// const
{
- std::same_as<typename decltype(span)::reference> decltype(auto) elem = std::as_const(span).at(idx);
+ std::same_as<typename decltype(anySpan)::reference> decltype(auto) elem = std::as_const(anySpan).at(index);
assert(elem == expectedValue);
}
}
@@ -39,26 +50,22 @@ constexpr void testSpanAt(auto span, int idx, int expectedValue) {
constexpr bool test() {
// With static extent
{
- std::array arr{0, 1, 2, 3, 4, 5, 9084};
- std::span arrSpan{arr};
+ std::array arr{0, 1, 2, 3, 4, 5, 9084, std::numeric_limits<int>::max()};
- assert(std::dynamic_extent != arrSpan.extent);
-
- testSpanAt(arrSpan, 0, 0);
- testSpanAt(arrSpan, 1, 1);
- testSpanAt(arrSpan, 6, 9084);
+ testSpanAt(arr, false, 0, 0);
+ testSpanAt(arr, false, 1, 1);
+ testSpanAt(arr, false, 6, 9084);
+ testSpanAt(arr, false, 7, std::numeric_limits<int>::max());
}
// With dynamic extent
{
- std::vector vec{0, 1, 2, 3, 4, 5, 9084};
- std::span vecSpan{vec};
-
- assert(std::dynamic_extent == vecSpan.extent);
+ std::vector vec{0, 1, 2, 3, 4, 5, 9084, std::numeric_limits<int>::max()};
- testSpanAt(vecSpan, 0, 0);
- testSpanAt(vecSpan, 1, 1);
- testSpanAt(vecSpan, 6, 9084);
+ testSpanAt(vec, true, 0, 0);
+ testSpanAt(vec, true, 1, 1);
+ testSpanAt(vec, true, 6, 9084);
+ testSpanAt(vec, true, 7, std::numeric_limits<int>::max());
}
return true;
@@ -66,16 +73,19 @@ constexpr bool test() {
void test_exceptions() {
#ifndef TEST_HAS_NO_EXCEPTIONS
+ using namespace std::string_literals;
+
// With static extent
{
- std::array arr{1, 2, 3, 4};
+ std::array arr{0, 1, 2, 3, 4, 5, 9084, std::numeric_limits<int>::max()};
const std::span arrSpan{arr};
try {
- TEST_IGNORE_NODISCARD arrSpan.at(arr.size() + 1);
+ std::ignore = arrSpan.at(arr.size());
assert(false);
- } catch (std::out_of_range const&) {
+ } catch (const std::out_of_range& e) {
// pass
+ assert(e.what() == "span"s);
} catch (...) {
assert(false);
}
@@ -86,10 +96,11 @@ void test_exceptions() {
const std::span arrSpan{arr};
try {
- TEST_IGNORE_NODISCARD arrSpan.at(0);
+ std::ignore = arrSpan.at(0);
assert(false);
- } catch (std::out_of_range const&) {
+ } catch (const std::out_of_range& e) {
// pass
+ assert(e.what() == "span"s);
} catch (...) {
assert(false);
}
@@ -98,14 +109,15 @@ void test_exceptions() {
// With dynamic extent
{
- std::vector vec{1, 2, 3, 4};
+ std::vector vec{0, 1, 2, 3, 4, 5, 9084, std::numeric_limits<int>::max()};
const std::span vecSpan{vec};
try {
- TEST_IGNORE_NODISCARD vecSpan.at(vec.size() + 1);
+ std::ignore = vecSpan.at(vec.size());
assert(false);
- } catch (std::out_of_range const&) {
+ } catch (const std::out_of_range& e) {
// pass
+ assert(e.what() == "span"s);
} catch (...) {
assert(false);
}
@@ -116,10 +128,11 @@ void test_exceptions() {
const std::span vecSpan{vec};
try {
- TEST_IGNORE_NODISCARD vecSpan.at(0);
+ std::ignore = vecSpan.at(0);
assert(false);
- } catch (std::out_of_range const&) {
+ } catch (const std::out_of_range& e) {
// pass
+ assert(e.what() == "span"s);
} catch (...) {
assert(false);
}
@@ -129,8 +142,9 @@ void test_exceptions() {
int main(int, char**) {
test();
- test_exceptions();
static_assert(test());
+ test_exceptions();
+
return 0;
}
diff --git a/libcxx/test/std/language.support/support.limits/support.limits.general/span.version.compile.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/span.version.compile.pass.cpp
index 355eb1338d945e..dbbbaf4ec7c228 100644
--- a/libcxx/test/std/language.support/support.limits/support.limits.general/span.version.compile.pass.cpp
+++ b/libcxx/test/std/language.support/support.limits/support.limits.general/span.version.compile.pass.cpp
@@ -17,6 +17,7 @@
/* Constant Value
__cpp_lib_span 202002L [C++20]
+ __cpp_lib_span_at 202311L [C++26]
__cpp_lib_span_initializer_list 202311L [C++26]
*/
@@ -29,6 +30,10 @@
# error "__cpp_lib_span should not be defined before c++20"
# endif
+# ifdef __cpp_lib_span_at
+# error "__cpp_lib_span_at should not be defined before c++26"
+# endif
+
# ifdef __cpp_lib_span_initializer_list
# error "__cpp_lib_span_initializer_list should not be defined before c++26"
# endif
@@ -39,6 +44,10 @@
# error "__cpp_lib_span should not be defined before c++20"
# endif
+# ifdef __cpp_lib_span_at
+# error "__cpp_lib_span_at should not be defined before c++26"
+# endif
+
# ifdef __cpp_lib_span_initializer_list
# error "__cpp_lib_span_initializer_list should not be defined before c++26"
# endif
@@ -49,6 +58,10 @@
# error "__cpp_lib_span should not be defined before c++20"
# endif
+# ifdef __cpp_lib_span_at
+# error "__cpp_lib_span_at should not be defined before c++26"
+# endif
+
# ifdef __cpp_lib_span_initializer_list
# error "__cpp_lib_span_initializer_list should not be defined before c++26"
# endif
@@ -62,6 +75,10 @@
# error "__cpp_lib_span should have the value 202002L in c++20"
# endif
+# ifdef __cpp_lib_span_at
+# error "__cpp_lib_span_at should not be defined before c++26"
+# endif
+
# ifdef __cpp_lib_span_initializer_list
# error "__cpp_lib_span_initializer_list should not be defined before c++26"
# endif
@@ -75,6 +92,10 @@
# error "__cpp_lib_span should have the value 202002L in c++23"
# endif
+# ifdef __cpp_lib_span_at
+# error "__cpp_lib_span_at should not be defined before c++26"
+# endif
+
# ifdef __cpp_lib_span_initializer_list
# error "__cpp_lib_span_initializer_list should not be defined before c++26"
# endif
@@ -88,6 +109,13 @@
# error "__cpp_lib_span should have the value 202002L in c++26"
# endif
+# ifndef __cpp_lib_span_at
+# error "__cpp_lib_span_at should be defined in c++26"
+# endif
+# if __cpp_lib_span_at != 202311L
+# error "__cpp_lib_span_at should have the value 202311L in c++26"
+# endif
+
# if !defined(_LIBCPP_VERSION)
# ifndef __cpp_lib_span_initializer_list
# error "__cpp_lib_span_initializer_list should be defined in c++26"
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 c0d3d554dcf056..ec2258cbb2c8fd 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
@@ -186,6 +186,7 @@
__cpp_lib_smart_ptr_owner_equality 202306L [C++26]
__cpp_lib_source_location 201907L [C++20]
__cpp_lib_span 202002L [C++20]
+ __cpp_lib_span_at 202311L [C++26]
__cpp_lib_span_initializer_list 202311L [C++26]
__cpp_lib_spanstream 202106L [C++23]
__cpp_lib_ssize 201902L [C++20]
@@ -879,6 +880,10 @@
# error "__cpp_lib_span should not be defined before c++20"
# endif
+# ifdef __cpp_lib_span_at
+# error "__cpp_lib_span_at should not be defined before c++26"
+# endif
+
# ifdef __cpp_lib_span_initializer_list
# error "__cpp_lib_span_initializer_list should not be defined before c++26"
# endif
@@ -1716,6 +1721,10 @@
# error "__cpp_lib_span should not be defined before c++20"
# endif
+# ifdef __cpp_lib_span_at
+# error "__cpp_lib_span_at should not be defined before c++26"
+# endif
+
# ifdef __cpp_lib_span_initializer_list
# error "__cpp_lib_span_initializer_list should not be defined before c++26"
# endif
@@ -2733,6 +2742,10 @@
# error "__cpp_lib_span should not be defined before c++20"
# endif
+# ifdef __cpp_lib_span_at
+# error "__cpp_lib_span_at should not be defined before c++26"
+# endif
+
# ifdef __cpp_lib_span_initializer_list
# error "__cpp_lib_span_initializer_list should not be defined before c++26"
# endif
@@ -4029,6 +4042,10 @@
# error "__cpp_lib_span should have the value 202002L in c++20"
# endif
+# ifdef __cpp_lib_span_at
+# error "__cpp_lib_span_at should not be defined before c++26"
+# endif
+
# ifdef __cpp_lib_span_initializer_list
# error "__cpp_lib_span_initializer_list should not be defined before c++26"
# endif
@@ -5547,6 +5564,10 @@
# error "__cpp_lib_span should have the value 202002L in c++23"
# endif
+# ifdef __cpp_lib_span_at
+# error "__cpp_lib_span_at should not be defined before c++26"
+# endif
+
# ifdef __cpp_lib_span_initializer_list
# error "__cpp_lib_span_initializer_list should not be defined before c++26"
# endif
@@ -7284,6 +7305,13 @@
# error "__cpp_lib_span should have the value 202002L in c++26"
# endif
+# ifndef __cpp_lib_span_at
+# error "__cpp_lib_span_at should be defined in c++26"
+# endif
+# if __cpp_lib_span_at != 202311L
+# error "__cpp_lib_span_at should have the value 202311L in c++26"
+# endif
+
# if !defined(_LIBCPP_VERSION)
# ifndef __cpp_lib_span_initializer_list
# error "__cpp_lib_span_initializer_list should be defined in c++26"
diff --git a/libcxx/utils/generate_feature_test_macro_components.py b/libcxx/utils/generate_feature_test_macro_components.py
index 6a30324397883a..19018bd05c1931 100755
--- a/libcxx/utils/generate_feature_test_macro_components.py
+++ b/libcxx/utils/generate_feature_test_macro_components.py
@@ -1082,6 +1082,11 @@ def add_version_header(tc):
},
"headers": ["span"],
},
+ {
+ "name": "__cpp_lib_span_at",
+ "values": {"c++26": 202311}, # P2821R3 span.at()
+ "headers": ["span"],
+ },
{
"name": "__cpp_lib_span_initializer_list",
"values": {"c++26": 202311}, # P2447R6 std::span over an initializer list
diff --git a/z_libcxx-dev-tools b/z_libcxx-dev-tools
new file mode 160000
index 00000000000000..229818e01844e2
--- /dev/null
+++ b/z_libcxx-dev-tools
@@ -0,0 +1 @@
+Subproject commit 229818e01844e2cad56818bf06703600071848c0
>From f3223eaf5131cae761f287b10d9c9c4725b3bff5 Mon Sep 17 00:00:00 2001
From: Zingam <zingam at outlook.com>
Date: Mon, 11 Dec 2023 10:31:05 +0200
Subject: [PATCH 8/9] Refactored test
---
.../views/views.span/span.elem/at.pass.cpp | 70 +++++++++++++------
1 file changed, 49 insertions(+), 21 deletions(-)
diff --git a/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp b/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
index fb5519365ae93a..ffa9e825c6d157 100644
--- a/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
+++ b/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
@@ -25,24 +25,19 @@
#include "test_macros.h"
-constexpr void testSpanAt(auto& container, bool hasDynamicExtent, int index, int expectedValue) {
- std::span anySpan{container};
-
- if (hasDynamicExtent) {
- assert(std::dynamic_extent == anySpan.extent);
- } else {
- assert(std::dynamic_extent != anySpan.extent);
- }
-
+template <typename ReferenceT>
+constexpr void testSpanAt(auto&& anySpan, int index, int expectedValue) {
// non-const
{
- std::same_as<typename decltype(anySpan)::reference> decltype(auto) elem = anySpan.at(index);
+ // std::same_as<typename decltype(anySpan)::reference> decltype(auto) elem = anySpan.at(index);
+ std::same_as<ReferenceT> decltype(auto) elem = anySpan.at(index);
assert(elem == expectedValue);
}
// const
{
- std::same_as<typename decltype(anySpan)::reference> decltype(auto) elem = std::as_const(anySpan).at(index);
+ // std::same_as<typename decltype(anySpan)::reference> decltype(auto) elem = std::as_const(anySpan).at(index);
+ std::same_as<ReferenceT> decltype(auto) elem = std::as_const(anySpan).at(index);
assert(elem == expectedValue);
}
}
@@ -50,22 +45,36 @@ constexpr void testSpanAt(auto& container, bool hasDynamicExtent, int index, int
constexpr bool test() {
// With static extent
{
- std::array arr{0, 1, 2, 3, 4, 5, 9084, std::numeric_limits<int>::max()};
+ std::array arr{0, 1, 2, 3, 4, 5, 9084};
+ std::span arrSpan{arr};
+
+ assert(std::dynamic_extent != arrSpan.extent);
+
+ using ReferenceT = typename decltype(arrSpan)::reference;
- testSpanAt(arr, false, 0, 0);
- testSpanAt(arr, false, 1, 1);
- testSpanAt(arr, false, 6, 9084);
- testSpanAt(arr, false, 7, std::numeric_limits<int>::max());
+ // testSpanAt(arrSpan, 0, 0);
+ // testSpanAt(arrSpan, 1, 1);
+ // testSpanAt(arrSpan, 6, 9084);
+ testSpanAt<ReferenceT>(arrSpan, 0, 0);
+ testSpanAt<ReferenceT>(arrSpan, 1, 1);
+ testSpanAt<ReferenceT>(arrSpan, 6, 9084);
}
// With dynamic extent
{
- std::vector vec{0, 1, 2, 3, 4, 5, 9084, std::numeric_limits<int>::max()};
+ std::vector vec{0, 1, 2, 3, 4, 5, 9084};
+ std::span vecSpan{vec};
+
+ assert(std::dynamic_extent == vecSpan.extent);
+
+ using ReferenceT = typename decltype(vecSpan)::reference;
- testSpanAt(vec, true, 0, 0);
- testSpanAt(vec, true, 1, 1);
- testSpanAt(vec, true, 6, 9084);
- testSpanAt(vec, true, 7, std::numeric_limits<int>::max());
+ // testSpanAt(vecSpan, 0, 0);
+ // testSpanAt(vecSpan, 1, 1);
+ // testSpanAt(vecSpan, 6, 9084);
+ testSpanAt<ReferenceT>(vecSpan, 0, 0);
+ testSpanAt<ReferenceT>(vecSpan, 1, 1);
+ testSpanAt<ReferenceT>(vecSpan, 6, 9084);
}
return true;
@@ -89,6 +98,16 @@ void test_exceptions() {
} catch (...) {
assert(false);
}
+
+ try {
+ std::ignore = arrSpan.at(arr.size() - 1);
+ // pass
+ assert(arrSpan.at(arr.size() - 1) == std::numeric_limits<int>::max());
+ } catch (const std::out_of_range&) {
+ assert(false);
+ } catch (...) {
+ assert(false);
+ }
}
{
@@ -121,6 +140,15 @@ void test_exceptions() {
} catch (...) {
assert(false);
}
+
+ try {
+ std::ignore = vecSpan.at(vec.size() - 1);
+ assert(vecSpan.at(vec.size() - 1) == std::numeric_limits<int>::max());
+ } catch (const std::out_of_range& e) {
+ assert(false);
+ } catch (...) {
+ assert(false);
+ }
}
{
>From f03897a231a5fc86797075913b8f57781825791a Mon Sep 17 00:00:00 2001
From: Zingam <zingam at outlook.com>
Date: Mon, 11 Dec 2023 10:32:32 +0200
Subject: [PATCH 9/9] Cleaned up
---
.../std/containers/views/views.span/span.elem/at.pass.cpp | 8 --------
1 file changed, 8 deletions(-)
diff --git a/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp b/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
index ffa9e825c6d157..92484f2e4665d3 100644
--- a/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
+++ b/libcxx/test/std/containers/views/views.span/span.elem/at.pass.cpp
@@ -29,14 +29,12 @@ template <typename ReferenceT>
constexpr void testSpanAt(auto&& anySpan, int index, int expectedValue) {
// non-const
{
- // std::same_as<typename decltype(anySpan)::reference> decltype(auto) elem = anySpan.at(index);
std::same_as<ReferenceT> decltype(auto) elem = anySpan.at(index);
assert(elem == expectedValue);
}
// const
{
- // std::same_as<typename decltype(anySpan)::reference> decltype(auto) elem = std::as_const(anySpan).at(index);
std::same_as<ReferenceT> decltype(auto) elem = std::as_const(anySpan).at(index);
assert(elem == expectedValue);
}
@@ -52,9 +50,6 @@ constexpr bool test() {
using ReferenceT = typename decltype(arrSpan)::reference;
- // testSpanAt(arrSpan, 0, 0);
- // testSpanAt(arrSpan, 1, 1);
- // testSpanAt(arrSpan, 6, 9084);
testSpanAt<ReferenceT>(arrSpan, 0, 0);
testSpanAt<ReferenceT>(arrSpan, 1, 1);
testSpanAt<ReferenceT>(arrSpan, 6, 9084);
@@ -69,9 +64,6 @@ constexpr bool test() {
using ReferenceT = typename decltype(vecSpan)::reference;
- // testSpanAt(vecSpan, 0, 0);
- // testSpanAt(vecSpan, 1, 1);
- // testSpanAt(vecSpan, 6, 9084);
testSpanAt<ReferenceT>(vecSpan, 0, 0);
testSpanAt<ReferenceT>(vecSpan, 1, 1);
testSpanAt<ReferenceT>(vecSpan, 6, 9084);
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