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 #include <tuple> 19 #include <string> 20 #include <cassert> 21 22 struct Empty {}; 23 24 int main() 25 { 26 { 27 typedef std::tuple<int> T; 28 const T t(3); 29 assert(std::get<0>(t) == 3); 30 } 31 { 32 typedef std::tuple<std::string, int> T; 33 const T t("high", 5); 34 assert(std::get<0>(t) == "high"); 35 assert(std::get<1>(t) == 5); 36 } 37 #if _LIBCPP_STD_VER > 11 38 { 39 typedef std::tuple<double, int> T; 40 constexpr T t(2.718, 5); 41 static_assert(std::get<0>(t) == 2.718, ""); 42 static_assert(std::get<1>(t) == 5, ""); 43 } 44 { 45 typedef std::tuple<Empty> T; 46 constexpr T t{Empty()}; 47 constexpr Empty e = std::get<0>(t); 48 } 49 #endif 50 { 51 typedef std::tuple<double&, std::string, int> T; 52 double d = 1.5; 53 const T t(d, "high", 5); 54 assert(std::get<0>(t) == 1.5); 55 assert(std::get<1>(t) == "high"); 56 assert(std::get<2>(t) == 5); 57 std::get<0>(t) = 2.5; 58 assert(std::get<0>(t) == 2.5); 59 assert(std::get<1>(t) == "high"); 60 assert(std::get<2>(t) == 5); 61 assert(d == 2.5); 62 } 63 } 64
