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 <size_t I, class... Types> 15 // typename tuple_element<I, tuple<Types...> >::type const& 16 // get(const tuple<Types...>& t); 17 18 // UNSUPPORTED: c++98, c++03 19 20 #include <tuple> 21 #include <string> 22 #include <cassert> 23 24 #include "test_macros.h" 25 26 struct Empty {}; 27 28 int main() 29 { 30 { 31 typedef std::tuple<int> T; 32 const T t(3); 33 assert(std::get<0>(t) == 3); 34 } 35 { 36 typedef std::tuple<std::string, int> T; 37 const T t("high", 5); 38 assert(std::get<0>(t) == "high"); 39 assert(std::get<1>(t) == 5); 40 } 41 #if TEST_STD_VER > 11 42 { 43 typedef std::tuple<double, int> T; 44 constexpr T t(2.718, 5); 45 static_assert(std::get<0>(t) == 2.718, ""); 46 static_assert(std::get<1>(t) == 5, ""); 47 } 48 { 49 typedef std::tuple<Empty> T; 50 constexpr T t{Empty()}; 51 constexpr Empty e = std::get<0>(t); 52 ((void)e); // Prevent unused warning 53 } 54 #endif 55 { 56 typedef std::tuple<double&, std::string, int> T; 57 double d = 1.5; 58 const T t(d, "high", 5); 59 assert(std::get<0>(t) == 1.5); 60 assert(std::get<1>(t) == "high"); 61 assert(std::get<2>(t) == 5); 62 std::get<0>(t) = 2.5; 63 assert(std::get<0>(t) == 2.5); 64 assert(std::get<1>(t) == "high"); 65 assert(std::get<2>(t) == 5); 66 assert(d == 2.5); 67 } 68 } 69
