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 // <tuple> 11 12 // template <class... Types> class tuple; 13 14 // template<class... Types> 15 // tuple<Types&...> tie(Types&... t); 16 17 // UNSUPPORTED: c++98, c++03 18 19 #include <tuple> 20 #include <string> 21 #include <cassert> 22 23 #include "test_macros.h" 24 25 #if TEST_STD_VER > 11 26 constexpr bool test_tie_constexpr() { 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 // FIXME: If/when tuple gets constexpr assignment 37 //res = std::make_tuple(101, nullptr, -1.0); 38 } 39 return true; 40 } 41 #endif 42 43 int main() 44 { 45 { 46 int i = 0; 47 std::string s; 48 std::tie(i, std::ignore, s) = std::make_tuple(42, 3.14, "C++"); 49 assert(i == 42); 50 assert(s == "C++"); 51 } 52 #if TEST_STD_VER > 11 53 { 54 static constexpr int i = 42; 55 static constexpr double f = 1.1; 56 constexpr std::tuple<const int &, const double &> t = std::tie(i, f); 57 static_assert ( std::get<0>(t) == 42, "" ); 58 static_assert ( std::get<1>(t) == 1.1, "" ); 59 } 60 { 61 static_assert(test_tie_constexpr(), ""); 62 } 63 #endif 64 } 65
