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<class T> struct tuple_size; 14 15 #include <cassert> 16 #include <complex> 17 #include <concepts> 18 19 template <typename C> 20 concept HasTupleSize = requires { std::tuple_size<C>{}; }; 21 22 struct SomeObject {}; 23 24 static_assert(!HasTupleSize<SomeObject>); 25 26 template <typename T> test()27void test() { 28 using C = std::complex<T>; 29 30 static_assert(HasTupleSize<C>); 31 static_assert(std::same_as<typename std::tuple_size<C>::value_type, size_t>); 32 static_assert(std::tuple_size<C>() == 2); 33 } 34 test()35void test() { 36 test<float>(); 37 test<double>(); 38 test<long double>(); 39 } 40