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 struct Empty {}; 25 26 int main() 27 { 28 { 29 typedef std::tuple<int> T; 30 const T t(3); 31 assert(std::get<0>(t) == 3); 32 } 33 { 34 typedef std::tuple<std::string, int> T; 35 const T t("high", 5); 36 assert(std::get<0>(t) == "high"); 37 assert(std::get<1>(t) == 5); 38 } 39 #if _LIBCPP_STD_VER > 11 40 { 41 typedef std::tuple<double, int> T; 42 constexpr T t(2.718, 5); 43 static_assert(std::get<0>(t) == 2.718, ""); 44 static_assert(std::get<1>(t) == 5, ""); 45 } 46 { 47 typedef std::tuple<Empty> T; 48 constexpr T t{Empty()}; 49 constexpr Empty e = std::get<0>(t); 50 ((void)e); // Prevent unused warning 51 } 52 #endif 53 { 54 typedef std::tuple<double&, std::string, int> T; 55 double d = 1.5; 56 const T t(d, "high", 5); 57 assert(std::get<0>(t) == 1.5); 58 assert(std::get<1>(t) == "high"); 59 assert(std::get<2>(t) == 5); 60 std::get<0>(t) = 2.5; 61 assert(std::get<0>(t) == 2.5); 62 assert(std::get<1>(t) == "high"); 63 assert(std::get<2>(t) == 5); 64 assert(d == 2.5); 65 } 66 } 67
