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& 16 // get(tuple<Types...>& t); 17 18 #include <tuple> 19 #include <string> 20 #include <cassert> 21 22 #if __cplusplus > 201103L 23 24 struct Empty {}; 25 26 struct S { 27 std::tuple<int, Empty> a; 28 int k; 29 Empty e; 30 constexpr S() : a{1,Empty{}}, k(std::get<0>(a)), e(std::get<1>(a)) {} 31 }; 32 33 constexpr std::tuple<int, int> getP () { return { 3, 4 }; } 34 #endif 35 36 int main() 37 { 38 { 39 typedef std::tuple<int> T; 40 T t(3); 41 assert(std::get<0>(t) == 3); 42 std::get<0>(t) = 2; 43 assert(std::get<0>(t) == 2); 44 } 45 { 46 typedef std::tuple<std::string, int> T; 47 T t("high", 5); 48 assert(std::get<0>(t) == "high"); 49 assert(std::get<1>(t) == 5); 50 std::get<0>(t) = "four"; 51 std::get<1>(t) = 4; 52 assert(std::get<0>(t) == "four"); 53 assert(std::get<1>(t) == 4); 54 } 55 { 56 typedef std::tuple<double&, std::string, int> T; 57 double d = 1.5; 58 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 std::get<1>(t) = "four"; 64 std::get<2>(t) = 4; 65 assert(std::get<0>(t) == 2.5); 66 assert(std::get<1>(t) == "four"); 67 assert(std::get<2>(t) == 4); 68 assert(d == 2.5); 69 } 70 #if _LIBCPP_STD_VER > 11 71 { // get on an rvalue tuple 72 static_assert ( std::get<0> ( std::make_tuple ( 0.0f, 1, 2.0, 3L )) == 0, "" ); 73 static_assert ( std::get<1> ( std::make_tuple ( 0.0f, 1, 2.0, 3L )) == 1, "" ); 74 static_assert ( std::get<2> ( std::make_tuple ( 0.0f, 1, 2.0, 3L )) == 2, "" ); 75 static_assert ( std::get<3> ( std::make_tuple ( 0.0f, 1, 2.0, 3L )) == 3, "" ); 76 static_assert(S().k == 1, ""); 77 static_assert(std::get<1>(getP()) == 4, ""); 78 } 79 #endif 80 81 } 82
