63 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<Types&...> tie(Types&... t);15 16// UNSUPPORTED: c++0317 18#include <tuple>19#include <string>20#include <cassert>21 22#include "test_macros.h"23 24TEST_CONSTEXPR_CXX1425bool test_tie()26{27 {28 int i = 42;29 double f = 1.1;30 using ExpectT = std::tuple<int&, decltype(std::ignore)&, double&>;31 auto res = std::tie(i, std::ignore, f);32 static_assert(std::is_same<ExpectT, decltype(res)>::value, "");33 assert(&std::get<0>(res) == &i);34 assert(&std::get<1>(res) == &std::ignore);35 assert(&std::get<2>(res) == &f);36 37#if TEST_STD_VER >= 2038 res = std::make_tuple(101, nullptr, -1.0);39 assert(i == 101);40 assert(f == -1.0);41#endif42 }43 return true;44}45 46int main(int, char**)47{48 test_tie();49#if TEST_STD_VER >= 1450 static_assert(test_tie(), "");51#endif52 53 {54 int i = 0;55 std::string s;56 std::tie(i, std::ignore, s) = std::make_tuple(42, 3.14, "C++");57 assert(i == 42);58 assert(s == "C++");59 }60 61 return 0;62}63