2ea5d167ae
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 --------- Co-authored-by: Zingam <zingam@outlook.com>
134 lines
3.4 KiB
C++
134 lines
3.4 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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// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23
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// <complex>
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// template<size_t I, class T>
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// constexpr T& get(complex<T>&) noexcept;
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// template<size_t I, class T>
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// constexpr T&& get(complex<T>&&) noexcept;
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// template<size_t I, class T>
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// constexpr const T& get(const complex<T>&) noexcept;
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// template<size_t I, class T>
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// constexpr const T&& get(const complex<T>&&) noexcept;
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#include <cassert>
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#include <complex>
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#include <concepts>
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#include <ranges>
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#include <vector>
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#include <utility>
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template <typename T>
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constexpr void test() {
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// &
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{
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std::complex<T> c{T{27}, T{28}};
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std::same_as<T&> decltype(auto) r = get<0>(c);
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static_assert(noexcept(get<0>(c)));
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assert(r == T{27});
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std::same_as<T&> decltype(auto) i = get<1>(c);
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static_assert(noexcept(get<1>(c)));
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assert(i == T{28});
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}
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// &&
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{
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std::complex<T> c{T{27}, T{28}};
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std::same_as<T&&> decltype(auto) r = get<0>(std::move(c));
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static_assert(noexcept(get<0>(c)));
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assert(r == T{27});
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}
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{
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std::complex<T> c{T{27}, T{28}};
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std::same_as<T&&> decltype(auto) i = get<1>(std::move(c));
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static_assert(noexcept(get<1>(c)));
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assert(i == T{28});
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}
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// const &
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{
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const std::complex<T> c{T{27}, T{28}};
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std::same_as<const T&> decltype(auto) r = get<0>(c);
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static_assert(noexcept(get<0>(c)));
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assert(r == T{27});
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std::same_as<const T&> decltype(auto) i = get<1>(c);
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static_assert(noexcept(get<1>(c)));
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assert(i == T{28});
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}
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// const &&
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{
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const std::complex<T> c{T{27}, T{28}};
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std::same_as<const T&&> decltype(auto) r = get<0>(std::move(c));
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static_assert(noexcept(get<0>(c)));
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assert(r == T{27});
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}
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{
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const std::complex<T> c{T{27}, T{28}};
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std::same_as<const T&&> decltype(auto) i = get<1>(std::move(c));
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static_assert(noexcept(get<1>(c)));
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assert(i == T{28});
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}
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// `get()` allows using `complex` with structured bindings
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{
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std::complex<T> c{T{27}, T{28}};
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auto [r, i]{c};
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static_assert(std::same_as<T, decltype(r)>);
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assert(r == T{27});
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static_assert(std::same_as<T, decltype(i)>);
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assert(i == T{28});
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}
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{
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std::complex<T> c{T{27}, T{28}};
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auto& [r, i]{c};
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static_assert(std::same_as<T, decltype(r)>);
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assert(r == T{27});
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static_assert(std::same_as<T, decltype(i)>);
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assert(i == T{28});
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}
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// `get()` allows using `complex` with ranges
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{
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std::complex<T> arr[]{{T{27}, T{28}}, {T{82}, T{94}}};
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std::same_as<std::vector<T>> decltype(auto) reals{
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arr | std::views::elements<0> | std::ranges::to<std::vector<T>>()};
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assert(reals.size() == 2);
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assert(reals[0] == T{27});
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assert(reals[1] == T{82});
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std::same_as<std::vector<T>> decltype(auto) imags{
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arr | std::views::elements<1> | std::ranges::to<std::vector<T>>()};
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assert(reals.size() == 2);
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assert(imags[0] == T{28});
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assert(imags[1] == T{94});
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}
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}
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constexpr bool test() {
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test<float>();
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test<double>();
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test<long double>();
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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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