[flang-commits] [libc] [libcxx] [lld] [llvm] [mlir] [compiler-rt] [flang] [clang] [libc++][complex] P2819R2 - Add `tuple` protocol to `complex` (PR #79744)
Hristo Hristov via flang-commits
flang-commits at lists.llvm.org
Mon Jan 29 21:05:44 PST 2024
https://github.com/H-G-Hristov updated https://github.com/llvm/llvm-project/pull/79744
>From 52cdb5a5ae4ad33bb16dfe05738d64ee568a24ce Mon Sep 17 00:00:00 2001
From: Zingam <zingam at outlook.com>
Date: Sat, 27 Jan 2024 21:12:16 +0200
Subject: [PATCH] [libc++][complex] P2819R2 - Add `tuple` protocol to `complex`
Implements: P2819R2 <https://wg21.link/P2819R2>
- https://eel.is/c++draft/utilities#concept:tuple-like
- https://eel.is/c++draft/complex.syn
- https://eel.is/c++draft/complex.tuple
---
libcxx/docs/ReleaseNotes/19.rst | 1 +
libcxx/docs/Status/Cxx2cPapers.csv | 2 +-
libcxx/include/CMakeLists.txt | 1 +
libcxx/include/__fwd/complex.h | 25 +++
libcxx/include/__fwd/get.h | 17 +++
libcxx/include/__tuple/tuple_like.h | 8 +
libcxx/include/complex | 142 ++++++++++++++++++
libcxx/include/libcxx.imp | 1 +
libcxx/include/module.modulemap.in | 2 +
libcxx/modules/std/complex.inc | 7 +
.../tuple/__tuple_like.compile.pass.cpp | 76 ++++++++++
.../complex.number/complex.tuple/get.pass.cpp | 87 +++++++++++
.../complex.tuple/get.verify.cpp | 60 ++++++++
.../tuple_element.compile.pass.cpp | 43 ++++++
.../complex.tuple/tuple_element.verify.cpp | 31 ++++
.../complex.tuple/tuple_size.compile.pass.cpp | 39 +++++
.../generate_feature_test_macro_components.py | 2 +-
17 files changed, 542 insertions(+), 2 deletions(-)
create mode 100644 libcxx/include/__fwd/complex.h
create mode 100644 libcxx/test/libcxx/utilities/tuple/__tuple_like.compile.pass.cpp
create mode 100644 libcxx/test/std/numerics/complex.number/complex.tuple/get.pass.cpp
create mode 100644 libcxx/test/std/numerics/complex.number/complex.tuple/get.verify.cpp
create mode 100644 libcxx/test/std/numerics/complex.number/complex.tuple/tuple_element.compile.pass.cpp
create mode 100644 libcxx/test/std/numerics/complex.number/complex.tuple/tuple_element.verify.cpp
create mode 100644 libcxx/test/std/numerics/complex.number/complex.tuple/tuple_size.compile.pass.cpp
diff --git a/libcxx/docs/ReleaseNotes/19.rst b/libcxx/docs/ReleaseNotes/19.rst
index 17a0415a8ad43..c9faa6f9d456c 100644
--- a/libcxx/docs/ReleaseNotes/19.rst
+++ b/libcxx/docs/ReleaseNotes/19.rst
@@ -38,6 +38,7 @@ What's New in Libc++ 19.0.0?
Implemented Papers
------------------
- P2637R3 - Member ``visit``
+- P2819R2 - Add ``tuple`` protocol to ``complex``
Improvements and New Features
diff --git a/libcxx/docs/Status/Cxx2cPapers.csv b/libcxx/docs/Status/Cxx2cPapers.csv
index a62faee4f44e2..1c895f79a4c0f 100644
--- a/libcxx/docs/Status/Cxx2cPapers.csv
+++ b/libcxx/docs/Status/Cxx2cPapers.csv
@@ -39,7 +39,7 @@
"`P2868R3 <https://wg21.link/P2868R3>`__","LWG","Remove Deprecated ``std::allocator`` Typedef From C++26","Kona November 2023","|Complete|","18.0",""
"`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",""
-"`P2819R2 <https://wg21.link/P2819R2>`__","LWG","Add tuple protocol to complex","Kona November 2023","","",""
+"`P2819R2 <https://wg21.link/P2819R2>`__","LWG","Add tuple protocol to complex","Kona November 2023","|Complete|","19.0",""
"`P2937R0 <https://wg21.link/P2937R0>`__","LWG","Freestanding: Remove ``strtok``","Kona November 2023","","",""
"`P2833R2 <https://wg21.link/P2833R2>`__","LWG","Freestanding Library: inout expected span","Kona November 2023","","",""
"`P2836R1 <https://wg21.link/P2836R1>`__","LWG","``std::basic_const_iterator`` should follow its underlying type's convertibility","Kona November 2023","","","|DR|"
diff --git a/libcxx/include/CMakeLists.txt b/libcxx/include/CMakeLists.txt
index ed721d467e94f..05332a3507d07 100644
--- a/libcxx/include/CMakeLists.txt
+++ b/libcxx/include/CMakeLists.txt
@@ -426,6 +426,7 @@ set(files
__functional/weak_result_type.h
__fwd/array.h
__fwd/bit_reference.h
+ __fwd/complex.h
__fwd/fstream.h
__fwd/get.h
__fwd/hash.h
diff --git a/libcxx/include/__fwd/complex.h b/libcxx/include/__fwd/complex.h
new file mode 100644
index 0000000000000..1c7be5a5ff750
--- /dev/null
+++ b/libcxx/include/__fwd/complex.h
@@ -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
+//
+//===---------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___FWD_COMPLEX_H
+#define _LIBCPP___FWD_COMPLEX_H
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+# pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class _Tp>
+class _LIBCPP_TEMPLATE_VIS complex;
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___FWD_COMPLEX_H
diff --git a/libcxx/include/__fwd/get.h b/libcxx/include/__fwd/get.h
index e7261b826953d..dfd2b5ae8d2bb 100644
--- a/libcxx/include/__fwd/get.h
+++ b/libcxx/include/__fwd/get.h
@@ -12,6 +12,7 @@
#include <__concepts/copyable.h>
#include <__config>
#include <__fwd/array.h>
+#include <__fwd/complex.h>
#include <__fwd/pair.h>
#include <__fwd/subrange.h>
#include <__fwd/tuple.h>
@@ -76,6 +77,22 @@ template <size_t _Ip, class _Tp, size_t _Size>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Tp&& get(const array<_Tp, _Size>&&) _NOEXCEPT;
#endif
+#if _LIBCPP_STD_VER >= 26
+
+template <size_t _Ip, class _Tp>
+_LIBCPP_HIDE_FROM_ABI constexpr _Tp& get(complex<_Tp>&) noexcept;
+
+template <size_t _Ip, class _Tp>
+_LIBCPP_HIDE_FROM_ABI constexpr _Tp&& get(complex<_Tp>&&) noexcept;
+
+template <size_t _Ip, class _Tp>
+_LIBCPP_HIDE_FROM_ABI constexpr const _Tp& get(const complex<_Tp>&) noexcept;
+
+template <size_t _Ip, class _Tp>
+_LIBCPP_HIDE_FROM_ABI constexpr const _Tp&& get(const complex<_Tp>&&) noexcept;
+
+#endif // _LIBCPP_STD_VER >= 26
+
#if _LIBCPP_STD_VER >= 20
namespace ranges {
diff --git a/libcxx/include/__tuple/tuple_like.h b/libcxx/include/__tuple/tuple_like.h
index dab395be616b7..0a619e7c99866 100644
--- a/libcxx/include/__tuple/tuple_like.h
+++ b/libcxx/include/__tuple/tuple_like.h
@@ -11,6 +11,7 @@
#include <__config>
#include <__fwd/array.h>
+#include <__fwd/complex.h>
#include <__fwd/pair.h>
#include <__fwd/subrange.h>
#include <__fwd/tuple.h>
@@ -41,6 +42,13 @@ struct __tuple_like_impl<array<_Tp, _Size> > : true_type {};
template <class _Ip, class _Sp, ranges::subrange_kind _Kp>
struct __tuple_like_impl<ranges::subrange<_Ip, _Sp, _Kp> > : true_type {};
+# if _LIBCPP_STD_VER >= 26
+
+template <class _Tp>
+struct __tuple_like_impl<complex<_Tp>> : true_type {};
+
+# endif
+
template <class _Tp>
concept __tuple_like = __tuple_like_impl<remove_cvref_t<_Tp>>::value;
diff --git a/libcxx/include/complex b/libcxx/include/complex
index 02b9db8c516db..a77d18b1f052c 100644
--- a/libcxx/include/complex
+++ b/libcxx/include/complex
@@ -227,6 +227,31 @@ template<class T> complex<T> sqrt (const complex<T>&);
template<class T> complex<T> tan (const complex<T>&);
template<class T> complex<T> tanh (const complex<T>&);
+ // [complex.tuple], tuple interface
+ template<class T> struct tuple_size; // Since C++26
+ template<size_t I, class T> struct tuple_element; // Since C++26
+ template<class T> struct tuple_size<complex<T>>; // Since C++26
+ template<size_t I, class T> struct tuple_element<I, complex<T>>; // Since C++26
+ template<size_t I, class T>
+ constexpr T& get(complex<T>&) noexcept; // Since C++26
+ template<size_t I, class T>
+ constexpr T&& get(complex<T>&&) noexcept; // Since C++26
+ template<size_t I, class T>
+ constexpr const T& get(const complex<T>&) noexcept; // Since C++26
+ template<size_t I, class T>
+ constexpr const T&& get(const complex<T>&&) noexcept; // Since C++26
+
+ // [complex.literals], complex literals
+ inline namespace literals {
+ inline namespace complex_literals {
+ constexpr complex<long double> operator""il(long double); // Since C++14
+ constexpr complex<long double> operator""il(unsigned long long); // Since C++14
+ constexpr complex<double> operator""i(long double); // Since C++14
+ constexpr complex<double> operator""i(unsigned long long); // Since C++14
+ constexpr complex<float> operator""if(long double); // Since C++14
+ constexpr complex<float> operator""if(unsigned long long); // Since C++14
+ }
+ }
} // std
*/
@@ -331,6 +356,20 @@ public:
*this = *this / complex(__c.real(), __c.imag());
return *this;
}
+
+#if _LIBCPP_STD_VER >= 26
+ template <size_t _Ip, class _Xp>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr _Xp& get(complex<_Xp>&) noexcept;
+
+ template <size_t _Ip, class _Xp>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr _Xp&& get(complex<_Xp>&&) noexcept;
+
+ template <size_t _Ip, class _Xp>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr const _Xp& get(const complex<_Xp>&) noexcept;
+
+ template <size_t _Ip, class _Xp>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr const _Xp&& get(const complex<_Xp>&&) noexcept;
+#endif
};
template <>
@@ -408,6 +447,20 @@ public:
*this = *this / complex(__c.real(), __c.imag());
return *this;
}
+
+#if _LIBCPP_STD_VER >= 26
+ template <size_t _Ip, class _Xp>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr _Xp& get(complex<_Xp>&) noexcept;
+
+ template <size_t _Ip, class _Xp>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr _Xp&& get(complex<_Xp>&&) noexcept;
+
+ template <size_t _Ip, class _Xp>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr const _Xp& get(const complex<_Xp>&) noexcept;
+
+ template <size_t _Ip, class _Xp>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr const _Xp&& get(const complex<_Xp>&&) noexcept;
+#endif
};
template <>
@@ -480,6 +533,20 @@ public:
*this = *this / complex(__c.real(), __c.imag());
return *this;
}
+
+#if _LIBCPP_STD_VER >= 26
+ template <size_t _Ip, class _Xp>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr _Xp& get(complex<_Xp>&) noexcept;
+
+ template <size_t _Ip, class _Xp>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr _Xp&& get(complex<_Xp>&&) noexcept;
+
+ template <size_t _Ip, class _Xp>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr const _Xp& get(const complex<_Xp>&) noexcept;
+
+ template <size_t _Ip, class _Xp>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr const _Xp&& get(const complex<_Xp>&&) noexcept;
+#endif
};
template <>
@@ -553,6 +620,20 @@ public:
*this = *this / complex(__c.real(), __c.imag());
return *this;
}
+
+#if _LIBCPP_STD_VER >= 26
+ template <size_t _Ip, class _Xp>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr _Xp& get(complex<_Xp>&) noexcept;
+
+ template <size_t _Ip, class _Xp>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr _Xp&& get(complex<_Xp>&&) noexcept;
+
+ template <size_t _Ip, class _Xp>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr const _Xp& get(const complex<_Xp>&) noexcept;
+
+ template <size_t _Ip, class _Xp>
+ friend _LIBCPP_HIDE_FROM_ABI constexpr const _Xp&& get(const complex<_Xp>&&) noexcept;
+#endif
};
inline _LIBCPP_CONSTEXPR complex<float>::complex(const complex<double>& __c) : __re_(__c.real()), __im_(__c.imag()) {}
@@ -1352,6 +1433,67 @@ operator<<(basic_ostream<_CharT, _Traits>& __os, const complex<_Tp>& __x) {
}
#endif // !_LIBCPP_HAS_NO_LOCALIZATION
+#if _LIBCPP_STD_VER >= 26
+
+// [complex.tuple], tuple interface
+
+template <class _Tp>
+struct tuple_size;
+
+template <class _Tp>
+struct tuple_size<complex<_Tp>> : integral_constant<size_t, 2> {};
+
+template <size_t _Ip, class _Tp>
+struct tuple_element;
+
+template <size_t _Ip, class _Tp>
+struct tuple_element<_Ip, complex<_Tp>> {
+ static_assert(_Ip < 2, "Index value is out of range.");
+ using type = _Tp;
+};
+
+template <size_t _Ip, class _Xp>
+_LIBCPP_HIDE_FROM_ABI constexpr _Xp& get(complex<_Xp>& __z) noexcept {
+ static_assert(_Ip < 2, "Index value is out of range.");
+ if constexpr (_Ip == 0) {
+ return static_cast<_Xp&>(__z.__re_);
+ } else {
+ return static_cast<_Xp&>(__z.__im_);
+ }
+}
+
+template <size_t _Ip, class _Xp>
+_LIBCPP_HIDE_FROM_ABI constexpr _Xp&& get(complex<_Xp>&& __z) noexcept {
+ static_assert(_Ip < 2, "Index value is out of range.");
+ if constexpr (_Ip == 0) {
+ return static_cast<_Xp&&>(__z.__re_);
+ } else {
+ return static_cast<_Xp&&>(__z.__im_);
+ }
+}
+
+template <size_t _Ip, class _Xp>
+_LIBCPP_HIDE_FROM_ABI constexpr const _Xp& get(const complex<_Xp>& __z) noexcept {
+ static_assert(_Ip < 2, "Index value is out of range.");
+ if constexpr (_Ip == 0) {
+ return static_cast<const _Xp&>(__z.__re_);
+ } else {
+ return static_cast<const _Xp&>(__z.__im_);
+ }
+}
+
+template <size_t _Ip, class _Xp>
+_LIBCPP_HIDE_FROM_ABI constexpr const _Xp&& get(const complex<_Xp>&& __z) noexcept {
+ static_assert(_Ip < 2, "Index value is out of range.");
+ if constexpr (_Ip == 0) {
+ return static_cast<const _Xp&&>(__z.__re_);
+ } else {
+ return static_cast<const _Xp&&>(__z.__im_);
+ }
+}
+
+#endif // _LIBCPP_STD_VER >= 26
+
#if _LIBCPP_STD_VER >= 14
// Literal suffix for complex number literals [complex.literals]
inline namespace literals {
diff --git a/libcxx/include/libcxx.imp b/libcxx/include/libcxx.imp
index 45fa4a9541917..4a6ca1c330280 100644
--- a/libcxx/include/libcxx.imp
+++ b/libcxx/include/libcxx.imp
@@ -421,6 +421,7 @@
{ include: [ "<__fwd/array.h>", "private", "<array>", "public" ] },
{ include: [ "<__fwd/bit_reference.h>", "private", "<bitset>", "public" ] },
{ include: [ "<__fwd/bit_reference.h>", "private", "<vector>", "public" ] },
+ { include: [ "<__fwd/complex.h>", "private", "<complex>", "public" ] },
{ include: [ "<__fwd/fstream.h>", "private", "<fstream>", "public" ] },
{ include: [ "<__fwd/hash.h>", "private", "<functional>", "public" ] },
{ include: [ "<__fwd/ios.h>", "private", "<ios>", "public" ] },
diff --git a/libcxx/include/module.modulemap.in b/libcxx/include/module.modulemap.in
index 194a74a1e07b1..a5aae481cff54 100644
--- a/libcxx/include/module.modulemap.in
+++ b/libcxx/include/module.modulemap.in
@@ -1197,6 +1197,8 @@ module std_private_compare_synth_three_way [system] { header "__c
module std_private_compare_three_way_comparable [system] { header "__compare/three_way_comparable.h" }
module std_private_compare_weak_order [system] { header "__compare/weak_order.h" }
+module std_private_complex_complex_fwd [system] { header "__fwd/complex.h" }
+
module std_private_concepts_arithmetic [system] { header "__concepts/arithmetic.h" }
module std_private_concepts_assignable [system] { header "__concepts/assignable.h" }
module std_private_concepts_boolean_testable [system] { header "__concepts/boolean_testable.h" }
diff --git a/libcxx/modules/std/complex.inc b/libcxx/modules/std/complex.inc
index 3ccf44fa02244..47a44420b127a 100644
--- a/libcxx/modules/std/complex.inc
+++ b/libcxx/modules/std/complex.inc
@@ -59,6 +59,13 @@ export namespace std {
using std::tan;
using std::tanh;
+#if _LIBCPP_STD_VER >= 26
+ // [complex.tuple], tuple interface
+ using std::get;
+ using std::tuple_element;
+ using std::tuple_size;
+#endif
+
// [complex.literals], complex literals
inline namespace literals {
inline namespace complex_literals {
diff --git a/libcxx/test/libcxx/utilities/tuple/__tuple_like.compile.pass.cpp b/libcxx/test/libcxx/utilities/tuple/__tuple_like.compile.pass.cpp
new file mode 100644
index 0000000000000..9f04f2cc04304
--- /dev/null
+++ b/libcxx/test/libcxx/utilities/tuple/__tuple_like.compile.pass.cpp
@@ -0,0 +1,76 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+
+// <tuple>
+
+#include <array>
+#include <complex>
+#include <ranges>
+#include <tuple>
+
+#include "test_iterators.h"
+
+static_assert(!std::__tuple_like<int>);
+
+static_assert(std::__tuple_like<std::array<int, 0>>);
+static_assert(std::__tuple_like<std::array<int, 1>>);
+static_assert(std::__tuple_like<std::array<int, 2>>);
+static_assert(std::__tuple_like<std::array<int, 2728>>);
+
+#if _LIBCPP_STD_VER >= 26
+static_assert(std::__tuple_like<std::complex<float>>);
+static_assert(std::__tuple_like<std::complex<double>>);
+static_assert(std::__tuple_like<std::complex<long double>>);
+#endif
+
+static_assert(std::__tuple_like<std::pair<int, float>>);
+
+static_assert(std::__tuple_like<std::tuple<int>>);
+static_assert(std::__tuple_like<std::tuple<int, float>>);
+static_assert(std::__tuple_like<std::tuple<int, float, double>>);
+
+using FI = forward_iterator<int*>;
+static_assert(std::__tuple_like<std::ranges::subrange<FI, FI, std::ranges::subrange_kind::sized>>);
+static_assert(std::__tuple_like<std::ranges::subrange<FI, FI, std::ranges::subrange_kind::unsized>>);
+static_assert(std::__tuple_like<std::ranges::subrange<int*, int*, std::ranges::subrange_kind::sized>>);
+static_assert(std::__tuple_like<std::ranges::subrange<int*, std::nullptr_t, std::ranges::subrange_kind::unsized>>);
+
+template <typename Iter>
+void test_subrange_sized() {
+ static_assert(std::__tuple_like<std::ranges::subrange<Iter, Iter, std::ranges::subrange_kind::sized>>);
+}
+
+template <typename Iter>
+void test_subrange_unsized() {
+ static_assert(std::__tuple_like<std::ranges::subrange<Iter, Iter, std::ranges::subrange_kind::unsized>>);
+}
+
+void test() {
+ test_subrange_sized<forward_iterator<int*>>();
+ test_subrange_sized<bidirectional_iterator<int*>>();
+ test_subrange_sized<random_access_iterator<int*>>();
+ test_subrange_sized<contiguous_iterator<int*>>();
+ test_subrange_sized<int*>();
+
+ test_subrange_sized<forward_iterator<int const*>>();
+ test_subrange_sized<bidirectional_iterator<int const*>>();
+ test_subrange_sized<random_access_iterator<int const*>>();
+ test_subrange_sized<contiguous_iterator<int const*>>();
+ test_subrange_sized<int const*>();
+
+ test_subrange_unsized<forward_iterator<int*>>();
+ test_subrange_unsized<bidirectional_iterator<int*>>();
+ static_assert(std::__tuple_like<std::ranges::subrange<int*, std::nullptr_t, std::ranges::subrange_kind::unsized>>);
+
+ test_subrange_unsized<forward_iterator<int const*>>();
+ test_subrange_unsized<bidirectional_iterator<int const*>>();
+ static_assert(
+ std::__tuple_like<std::ranges::subrange<const int*, std::nullptr_t, std::ranges::subrange_kind::unsized>>);
+}
diff --git a/libcxx/test/std/numerics/complex.number/complex.tuple/get.pass.cpp b/libcxx/test/std/numerics/complex.number/complex.tuple/get.pass.cpp
new file mode 100644
index 0000000000000..0ada5c71777a7
--- /dev/null
+++ b/libcxx/test/std/numerics/complex.number/complex.tuple/get.pass.cpp
@@ -0,0 +1,87 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+
+// <complex>
+
+// template<size_t I, class T>
+// constexpr T& get(complex<T>&) noexcept;
+// template<size_t I, class T>
+// constexpr T&& get(complex<T>&&) noexcept;
+// template<size_t I, class T>
+// constexpr const T& get(const complex<T>&) noexcept;
+// template<size_t I, class T>
+// constexpr const T&& get(const complex<T>&&) noexcept;
+
+#include <cassert>
+#include <concepts>
+#include <complex>
+#include <utility>
+
+template <typename T>
+constexpr void test() {
+ // &
+ {
+ std::complex<T> c{T{27}, T{28}};
+
+ std::same_as<T&> decltype(auto) r = get<0>(c);
+ static_assert(noexcept(get<0>(c)));
+ assert(r == T{27});
+ std::same_as<T&> decltype(auto) i = get<1>(c);
+ static_assert(noexcept(get<1>(c)));
+ assert(i == T{28});
+ }
+ // &&
+ {
+ std::complex<T> c{T{27}, T{28}};
+
+ std::same_as<T&&> decltype(auto) r = get<0>(std::move(c));
+ static_assert(noexcept(get<0>(c)));
+ assert(r == T{27});
+ std::same_as<T&&> decltype(auto) i = get<1>(std::move(c));
+ assert(i == T{28});
+ }
+ // const &
+ {
+ const std::complex<T> c{T{27}, T{28}};
+
+ std::same_as<const T&> decltype(auto) r = get<0>(c);
+ static_assert(noexcept(get<0>(c)));
+ assert(r == T{27});
+ std::same_as<const T&> decltype(auto) i = get<1>(c);
+ static_assert(noexcept(get<1>(c)));
+ assert(i == T{28});
+ }
+ // const &&
+ {
+ const std::complex<T> c{T{27}, T{28}};
+
+ std::same_as<const T&&> decltype(auto) r = get<0>(std::move(c));
+ static_assert(noexcept(get<0>(c)));
+ assert(r == T{27});
+ std::same_as<const T&&> decltype(auto) i = get<1>(std::move(c));
+ static_assert(noexcept(get<1>(c)));
+ assert(i == T{28});
+ }
+}
+
+constexpr bool test() {
+ test<float>();
+ test<double>();
+ test<long double>();
+
+ return true;
+}
+
+int main(int, char**) {
+ test();
+ static_assert(test());
+
+ return 0;
+}
diff --git a/libcxx/test/std/numerics/complex.number/complex.tuple/get.verify.cpp b/libcxx/test/std/numerics/complex.number/complex.tuple/get.verify.cpp
new file mode 100644
index 0000000000000..6a6e3a968d50f
--- /dev/null
+++ b/libcxx/test/std/numerics/complex.number/complex.tuple/get.verify.cpp
@@ -0,0 +1,60 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+
+// <complex>
+
+// template<size_t I, class T>
+// constexpr T& get(complex<T>&) noexcept;
+// template<size_t I, class T>
+// constexpr T&& get(complex<T>&&) noexcept;
+// template<size_t I, class T>
+// constexpr const T& get(const complex<T>&) noexcept;
+// template<size_t I, class T>
+// constexpr const T&& get(const complex<T>&&) noexcept;
+
+#include <cassert>
+#include <complex>
+#include <utility>
+
+template <typename T>
+void test() {
+ using C = std::complex<T>;
+
+ // &
+ {
+ C c{T{27}, T{28}};
+ // expected-error-re@*:* 3{{static assertion failed {{.*}}Index value is out of range.}}
+ std::get<3>(c);
+ }
+ // &&
+ {
+ C c{T{27}, T{28}};
+ // expected-error-re@*:* 3 {{static assertion failed {{.*}}Index value is out of range.}}
+ std::get<3>(std::move(c));
+ }
+ // const &
+ {
+ const C c{T{27}, T{28}};
+ // expected-error-re@*:* 3 {{static assertion failed {{.*}}Index value is out of range.}}
+ std::get<3>(c);
+ }
+ // const &&
+ {
+ const C c{T{27}, T{28}};
+ // expected-error-re@*:* 3 {{static assertion failed {{.*}}Index value is out of range.}}
+ std::get<3>(std::move(c));
+ }
+}
+
+void test() {
+ test<float>();
+ test<double>();
+ test<long double>();
+}
diff --git a/libcxx/test/std/numerics/complex.number/complex.tuple/tuple_element.compile.pass.cpp b/libcxx/test/std/numerics/complex.number/complex.tuple/tuple_element.compile.pass.cpp
new file mode 100644
index 0000000000000..896af798efa20
--- /dev/null
+++ b/libcxx/test/std/numerics/complex.number/complex.tuple/tuple_element.compile.pass.cpp
@@ -0,0 +1,43 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+
+// <complex>
+
+// template<size_t I, class T> struct tuple_element;
+
+#include <cassert>
+#include <concepts>
+#include <complex>
+
+template <size_t I, typename C>
+concept HasTupleElement = requires { std::tuple_element<I, C>{}; };
+
+struct SomeObject {};
+
+static_assert(!HasTupleElement<0, SomeObject>);
+static_assert(!HasTupleElement<1, SomeObject>);
+static_assert(!HasTupleElement<3, SomeObject>);
+
+template <typename T>
+void test() {
+ using C = std::complex<T>;
+
+ static_assert(HasTupleElement<0, C>);
+ static_assert(HasTupleElement<1, C>);
+
+ static_assert(std::same_as<typename std::tuple_element<0, C>::type, T>);
+ static_assert(std::same_as<typename std::tuple_element<1, C>::type, T>);
+}
+
+void test() {
+ test<float>();
+ test<double>();
+ test<long double>();
+}
diff --git a/libcxx/test/std/numerics/complex.number/complex.tuple/tuple_element.verify.cpp b/libcxx/test/std/numerics/complex.number/complex.tuple/tuple_element.verify.cpp
new file mode 100644
index 0000000000000..3fab9e94b0005
--- /dev/null
+++ b/libcxx/test/std/numerics/complex.number/complex.tuple/tuple_element.verify.cpp
@@ -0,0 +1,31 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+
+// <complex>
+
+// template<size_t I, class T> struct tuple_element;
+
+#include <cassert>
+#include <concepts>
+#include <complex>
+
+template <typename T>
+void test() {
+ using C = std::complex<T>;
+
+ // expected-error-re@*:* 3 {{static assertion failed {{.*}}Index value is out of range.}}
+ [[maybe_unused]] std::tuple_element<3, C> te{};
+}
+
+void test() {
+ test<float>();
+ test<double>();
+ test<long double>();
+}
diff --git a/libcxx/test/std/numerics/complex.number/complex.tuple/tuple_size.compile.pass.cpp b/libcxx/test/std/numerics/complex.number/complex.tuple/tuple_size.compile.pass.cpp
new file mode 100644
index 0000000000000..6812680445511
--- /dev/null
+++ b/libcxx/test/std/numerics/complex.number/complex.tuple/tuple_size.compile.pass.cpp
@@ -0,0 +1,39 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+
+// <complex>
+
+// template<class T> struct tuple_size;
+
+#include <cassert>
+#include <concepts>
+#include <complex>
+
+template <typename C>
+concept HasTupleSize = requires { std::tuple_size<C>{}; };
+
+struct SomeObject {};
+
+static_assert(!HasTupleSize<SomeObject>);
+
+template <typename T>
+void test() {
+ using C = std::complex<T>;
+
+ static_assert(HasTupleSize<C>);
+ static_assert(std::same_as<typename std::tuple_size<C>::value_type, size_t>);
+ static_assert(std::tuple_size<C>() == 2);
+}
+
+void test() {
+ test<float>();
+ test<double>();
+ test<long double>();
+}
diff --git a/libcxx/utils/generate_feature_test_macro_components.py b/libcxx/utils/generate_feature_test_macro_components.py
index 065b70620cd17..1408fd51c364c 100755
--- a/libcxx/utils/generate_feature_test_macro_components.py
+++ b/libcxx/utils/generate_feature_test_macro_components.py
@@ -1223,7 +1223,7 @@ def add_version_header(tc):
"name": "__cpp_lib_tuple_like",
"values": {
"c++23": 202207, # P2165R4 Compatibility between tuple, pair and tuple-like objects
- "c++26": 202311, # P2819R2 Add tuple protocol to complex
+ "c++26": 202311, # P2819R2 Add tuple protocol to complex (implemented)
},
"headers": ["map", "tuple", "unordered_map", "utility"],
"unimplemented": True,
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