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//===----------------------------------------------------------------------===//
//
// 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 <concepts>
#include <ranges>
#include <vector>
#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::complex<T> c{T{27}, T{28}};
std::same_as<T&&> decltype(auto) i = get<1>(std::move(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>(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});
}
{
const std::complex<T> c{T{27}, T{28}};
std::same_as<const T&&> decltype(auto) i = get<1>(std::move(c));
static_assert(noexcept(get<1>(c)));
assert(i == T{28});
}
// `get()` allows using `complex` with structured bindings
{
std::complex<T> c{T{27}, T{28}};
auto [r, i]{c};
static_assert(std::same_as<T, decltype(r)>);
assert(r == T{27});
static_assert(std::same_as<T, decltype(i)>);
assert(i == T{28});
}
{
std::complex<T> c{T{27}, T{28}};
auto& [r, i]{c};
static_assert(std::same_as<T, decltype(r)>);
assert(r == T{27});
static_assert(std::same_as<T, decltype(i)>);
assert(i == T{28});
}
// `get()` allows using `complex` with ranges
{
std::complex<T> arr[]{{T{27}, T{28}}, {T{82}, T{94}}};
std::same_as<std::vector<T>> decltype(auto) reals{
arr | std::views::elements<0> | std::ranges::to<std::vector<T>>()};
assert(reals.size() == 2);
assert(reals[0] == T{27});
assert(reals[1] == T{82});
std::same_as<std::vector<T>> decltype(auto) imags{
arr | std::views::elements<1> | std::ranges::to<std::vector<T>>()};
assert(imags.size() == 2);
assert(imags[0] == T{28});
assert(imags[1] == T{94});
}
}
constexpr bool test() {
test<float>();
test<double>();
test<long double>();
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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