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[libc++] Implements P2517R1. (#77239)

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As pointed out by @Zingam the paper was implemented in libc++ as an
extension. This patch does the bookkeeping. The inital release version
is based on historical release dates.

Completes:
- Add a conditional noexcept specification to std::apply
This commit is contained in:
Mark de Wever 2024-01-09 19:11:40 +01:00 committed by GitHub
parent 064e73cd54
commit d29297239f
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4 changed files with 12 additions and 3 deletions
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1
libcxx/docs/ReleaseNotes/18.rst
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@ -59,6 +59,7 @@ Implemented Papers
- P2821R5 - span.at() - P2821R5 - span.at()
- P0521R0 - Proposed Resolution for CA 14 (shared_ptr use_count/unique) - P0521R0 - Proposed Resolution for CA 14 (shared_ptr use_count/unique)
- P1759R6 - Native handles and file streams - P1759R6 - Native handles and file streams
- P2517R1 - Add a conditional ``noexcept`` specification to ``std::apply``
Improvements and New Features Improvements and New Features

2
libcxx/docs/Status/Cxx23Papers.csv
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@ -83,7 +83,7 @@
"`P2502R2 <https://wg21.link/P2502R2>`__","LWG","``std::generator``: Synchronous Coroutine Generator for Ranges","July 2022","","","|ranges|" "`P2502R2 <https://wg21.link/P2502R2>`__","LWG","``std::generator``: Synchronous Coroutine Generator for Ranges","July 2022","","","|ranges|"
"`P2508R1 <https://wg21.link/P2508R1>`__","LWG","Exposing ``std::basic-format-string``","July 2022","|Complete|","15.0" "`P2508R1 <https://wg21.link/P2508R1>`__","LWG","Exposing ``std::basic-format-string``","July 2022","|Complete|","15.0"
"`P2513R4 <https://wg21.link/P2513R4>`__","LWG","``char8_t`` Compatibility and Portability Fixes","July 2022","","" "`P2513R4 <https://wg21.link/P2513R4>`__","LWG","``char8_t`` Compatibility and Portability Fixes","July 2022","",""
"`P2517R1 <https://wg21.link/P2517R1>`__","LWG","Add a conditional ``noexcept`` specification to ``std::apply``","July 2022","","" "`P2517R1 <https://wg21.link/P2517R1>`__","LWG","Add a conditional ``noexcept`` specification to ``std::apply``","July 2022","|Complete|","3.9"
"`P2520R0 <https://wg21.link/P2520R0>`__","LWG","``move_iterator`` should be a random access iterator","July 2022","|Complete| [#note-P2520R0]_","17.0","|ranges|" "`P2520R0 <https://wg21.link/P2520R0>`__","LWG","``move_iterator`` should be a random access iterator","July 2022","|Complete| [#note-P2520R0]_","17.0","|ranges|"
"`P2540R1 <https://wg21.link/P2540R1>`__","LWG","Empty Product for certain Views","July 2022","","","|ranges|" "`P2540R1 <https://wg21.link/P2540R1>`__","LWG","Empty Product for certain Views","July 2022","","","|ranges|"
"`P2549R1 <https://wg21.link/P2549R1>`__","LWG","``std::unexpected`` should have ``error()`` as member accessor","July 2022","|Complete|","16.0" "`P2549R1 <https://wg21.link/P2549R1>`__","LWG","``std::unexpected`` should have ``error()`` as member accessor","July 2022","|Complete|","16.0"

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2
libcxx/include/tuple
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@ -141,7 +141,7 @@ template <class... Tuples> tuple<CTypes...> tuple_cat(Tuples&&... tpls); // cons
// [tuple.apply], calling a function with a tuple of arguments: // [tuple.apply], calling a function with a tuple of arguments:
template <class F, class Tuple> template <class F, class Tuple>
constexpr decltype(auto) apply(F&& f, Tuple&& t); // C++17 constexpr decltype(auto) apply(F&& f, Tuple&& t) noexcept(see below); // C++17 noexcept since C++23
template <class T, class Tuple> template <class T, class Tuple>
constexpr T make_from_tuple(Tuple&& t); // C++17 constexpr T make_from_tuple(Tuple&& t); // C++17

10
libcxx/test/std/utilities/tuple/tuple.tuple/tuple.apply/apply.pass.cpp
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@ -10,7 +10,7 @@
// <tuple> // <tuple>
// template <class F, class T> constexpr decltype(auto) apply(F &&, T &&) // template <class F, class T> constexpr decltype(auto) apply(F &&, T &&) noexcept(see below) // noexcept since C++23
// Test with different ref/ptr/cv qualified argument types. // Test with different ref/ptr/cv qualified argument types.
@ -192,7 +192,11 @@ void test_noexcept()
// test that the functions noexcept-ness is propagated // test that the functions noexcept-ness is propagated
using Tup = std::tuple<int, const char*, long>; using Tup = std::tuple<int, const char*, long>;
Tup t; Tup t;
#if TEST_STD_VER >= 23
ASSERT_NOEXCEPT(std::apply(nec, t));
#else
LIBCPP_ASSERT_NOEXCEPT(std::apply(nec, t)); LIBCPP_ASSERT_NOEXCEPT(std::apply(nec, t));
#endif
ASSERT_NOT_NOEXCEPT(std::apply(tc, t)); ASSERT_NOT_NOEXCEPT(std::apply(tc, t));
} }
{ {
@ -200,7 +204,11 @@ void test_noexcept()
using Tup = std::tuple<NothrowMoveable, int>; using Tup = std::tuple<NothrowMoveable, int>;
Tup t; Tup t;
ASSERT_NOT_NOEXCEPT(std::apply(nec, t)); ASSERT_NOT_NOEXCEPT(std::apply(nec, t));
#if TEST_STD_VER >= 23
ASSERT_NOEXCEPT(std::apply(nec, std::move(t)));
#else
LIBCPP_ASSERT_NOEXCEPT(std::apply(nec, std::move(t))); LIBCPP_ASSERT_NOEXCEPT(std::apply(nec, std::move(t)));
#endif
} }
} }