617b446176
[P1789R3](https://isocpp.org/files/papers/P1789R3.pdf) was accepted for C++26 through LWG motion 14 at the 2025 Kona meeting. This patch implements it, along with tests and documentation changes. Closes #167268 --------- Co-authored-by: Tsche <che@pydong.org>
55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// REQUIRES: std-at-least-c++26
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// <utility>
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// template<size_t I, class T, T... Values>
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// struct tuple_element<I, integer_sequence<T, Values...>>;
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// template<size_t I, class T, T... Values>
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// struct tuple_element<I, const integer_sequence<T, Values...>>;
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// template<size_t I, class T, T... Values>
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// constexpr T get(integer_sequence<T, Values...>) noexcept;
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#include <cassert>
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#include <utility>
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constexpr bool test() {
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auto [elt0, elt1, elt2, elt3] = std::make_index_sequence<4>();
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assert(elt0 == 0);
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assert(elt1 == 1);
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assert(elt2 == 2);
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assert(elt3 == 3);
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// TODO: remove this macro guard once GCC16 is available
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#if __cpp_structured_bindings >= 202411L
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[]<typename...> {
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auto [... empty] = std::make_index_sequence<0>();
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static_assert(sizeof...(empty) == 0);
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auto [... size4] = std::make_index_sequence<4>();
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static_assert(sizeof...(size4) == 4);
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assert(size4...[0] == 0);
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assert(size4...[1] == 1);
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assert(size4...[2] == 2);
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assert(size4...[3] == 3);
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}();
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#endif
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return true;
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}
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int main(int, char**) {
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test();
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static_assert(test());
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return 0;
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}
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