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 // <tuple> 10 11 // template <class... Types> class tuple; 12 13 // template<class... Types> 14 // tuple<Types&...> tie(Types&... t); 15 16 // UNSUPPORTED: c++03 17 18 #include <tuple> 19 #include <string> 20 #include <cassert> 21 22 #include "test_macros.h" 23 24 #if TEST_STD_VER > 11 25 constexpr bool test_tie_constexpr() { 26 { 27 int i = 42; 28 double f = 1.1; 29 using ExpectT = std::tuple<int&, decltype(std::ignore)&, double&>; 30 auto res = std::tie(i, std::ignore, f); 31 static_assert(std::is_same<ExpectT, decltype(res)>::value, ""); 32 assert(&std::get<0>(res) == &i); 33 assert(&std::get<1>(res) == &std::ignore); 34 assert(&std::get<2>(res) == &f); 35 // FIXME: If/when tuple gets constexpr assignment 36 //res = std::make_tuple(101, nullptr, -1.0); 37 } 38 return true; 39 } 40 #endif 41 42 int main(int, char**) 43 { 44 { 45 int i = 0; 46 std::string s; 47 std::tie(i, std::ignore, s) = std::make_tuple(42, 3.14, "C++"); 48 assert(i == 42); 49 assert(s == "C++"); 50 } 51 #if TEST_STD_VER > 11 52 { 53 static constexpr int i = 42; 54 static constexpr double f = 1.1; 55 constexpr std::tuple<const int &, const double &> t = std::tie(i, f); 56 static_assert ( std::get<0>(t) == 42, "" ); 57 static_assert ( std::get<1>(t) == 1.1, "" ); 58 } 59 { 60 static_assert(test_tie_constexpr(), ""); 61 } 62 #endif 63 64 return 0; 65 } 66