1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23
10
11// <complex>
12
13// template<size_t I, class T> struct tuple_element;
14
15#include <cassert>
16#include <complex>
17#include <concepts>
18
19template <size_t I, typename C>
20concept HasTupleElement = requires { std::tuple_element<I, C>{}; };
21
22struct SomeObject {};
23
24static_assert(!HasTupleElement<0, SomeObject>);
25static_assert(!HasTupleElement<1, SomeObject>);
26static_assert(!HasTupleElement<3, SomeObject>);
27
28template <typename T>
29void test() {
30 using C = std::complex<T>;
31
32 static_assert(HasTupleElement<0, C>);
33 static_assert(HasTupleElement<1, C>);
34
35 static_assert(std::same_as<typename std::tuple_element<0, C>::type, T>);
36 static_assert(std::same_as<typename std::tuple_element<1, C>::type, T>);
37}
38
39void test() {
40 test<float>();
41 test<double>();
42 test<long double>();
43}
44

source code of libcxx/test/std/numerics/complex.number/complex.tuple/tuple_element.compile.pass.cpp