1//===----------------------------------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is dual licensed under the MIT and the University of Illinois Open 6// Source Licenses. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10// UNSUPPORTED: c++98, c++03, c++11 11 12// <experimental/tuple> 13 14// template <class T> constexpr size_t tuple_size_v = tuple_size<T>::value; 15 16#include <experimental/tuple> 17#include <utility> 18#include <array> 19 20namespace ex = std::experimental; 21 22template <class Tuple, int Expect> 23void test() 24{ 25 static_assert(ex::tuple_size_v<Tuple> == Expect, ""); 26 static_assert(ex::tuple_size_v<Tuple> == std::tuple_size<Tuple>::value, ""); 27 static_assert(ex::tuple_size_v<Tuple const> == std::tuple_size<Tuple>::value, ""); 28 static_assert(ex::tuple_size_v<Tuple volatile> == std::tuple_size<Tuple>::value, ""); 29 static_assert(ex::tuple_size_v<Tuple const volatile> == std::tuple_size<Tuple>::value, ""); 30} 31 32int main() 33{ 34 test<std::tuple<>, 0>(); 35 36 test<std::tuple<int>, 1>(); 37 test<std::array<int, 1>, 1>(); 38 39 test<std::tuple<int, int>, 2>(); 40 test<std::pair<int, int>, 2>(); 41 test<std::array<int, 2>, 2>(); 42 43 test<std::tuple<int, int, int>, 3>(); 44 test<std::array<int, 3>, 3>(); 45} 46