66 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// <tuple>10 11// template <class... Types> class tuple;12 13// template<class... Types>14// tuple<VTypes...> make_tuple(Types&&... t);15 16// UNSUPPORTED: c++0317 18#include <tuple>19#include <functional>20#include <cassert>21 22#include "test_macros.h"23 24TEST_CONSTEXPR_CXX2025bool test()26{27 int i = 0;28 float j = 0;29 std::tuple<int, int&, float&> t =30 std::make_tuple(1, std::ref(i), std::ref(j));31 assert(std::get<0>(t) == 1);32 assert(std::get<1>(t) == 0);33 assert(std::get<2>(t) == 0);34 i = 2;35 j = 3.5;36 assert(std::get<0>(t) == 1);37 assert(std::get<1>(t) == 2);38 assert(std::get<2>(t) == 3.5);39 std::get<1>(t) = 0;40 std::get<2>(t) = 0;41 assert(i == 0);42 assert(j == 0);43 44 return true;45}46 47int main(int, char**)48{49 test();50#if TEST_STD_VER >= 2051 static_assert(test());52#endif53 54#if TEST_STD_VER > 1155 {56 constexpr auto t1 = std::make_tuple(0, 1, 3.14);57 constexpr int i1 = std::get<1>(t1);58 constexpr double d1 = std::get<2>(t1);59 static_assert (i1 == 1, "" );60 static_assert (d1 == 3.14, "" );61 }62#endif63 64 return 0;65}66