1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // <tuple> 10 11 // template <class... Types> class tuple; 12 13 // template <class... UTypes> 14 // tuple& operator=(tuple<UTypes...>&& u); 15 16 // UNSUPPORTED: c++98, c++03 17 18 #include <tuple> 19 #include <string> 20 #include <memory> 21 #include <utility> 22 #include <cassert> 23 24 #include "test_macros.h" 25 26 struct B 27 { 28 int id_; 29 30 explicit B(int i= 0) : id_(i) {} 31 32 virtual ~B() {} 33 }; 34 35 struct D 36 : B 37 { 38 explicit D(int i) : B(i) {} 39 }; 40 41 struct E { 42 E() = default; 43 E& operator=(int) { 44 return *this; 45 } 46 }; 47 48 int main(int, char**) 49 { 50 { 51 typedef std::tuple<long> T0; 52 typedef std::tuple<long long> T1; 53 T0 t0(2); 54 T1 t1; 55 t1 = std::move(t0); 56 assert(std::get<0>(t1) == 2); 57 } 58 { 59 typedef std::tuple<long, char> T0; 60 typedef std::tuple<long long, int> T1; 61 T0 t0(2, 'a'); 62 T1 t1; 63 t1 = std::move(t0); 64 assert(std::get<0>(t1) == 2); 65 assert(std::get<1>(t1) == int('a')); 66 } 67 { 68 typedef std::tuple<long, char, D> T0; 69 typedef std::tuple<long long, int, B> T1; 70 T0 t0(2, 'a', D(3)); 71 T1 t1; 72 t1 = std::move(t0); 73 assert(std::get<0>(t1) == 2); 74 assert(std::get<1>(t1) == int('a')); 75 assert(std::get<2>(t1).id_ == 3); 76 } 77 { 78 D d(3); 79 D d2(2); 80 typedef std::tuple<long, char, D&> T0; 81 typedef std::tuple<long long, int, B&> T1; 82 T0 t0(2, 'a', d2); 83 T1 t1(1, 'b', d); 84 t1 = std::move(t0); 85 assert(std::get<0>(t1) == 2); 86 assert(std::get<1>(t1) == int('a')); 87 assert(std::get<2>(t1).id_ == 2); 88 } 89 { 90 typedef std::tuple<long, char, std::unique_ptr<D>> T0; 91 typedef std::tuple<long long, int, std::unique_ptr<B>> T1; 92 T0 t0(2, 'a', std::unique_ptr<D>(new D(3))); 93 T1 t1; 94 t1 = std::move(t0); 95 assert(std::get<0>(t1) == 2); 96 assert(std::get<1>(t1) == int('a')); 97 assert(std::get<2>(t1)->id_ == 3); 98 } 99 { 100 // Test that tuple evaluates correctly applies an lvalue reference 101 // before evaluating is_assignable (ie 'is_assignable<int&, int&&>') 102 // instead of evaluating 'is_assignable<int&&, int&&>' which is false. 103 int x = 42; 104 int y = 43; 105 std::tuple<int&&, E> t(std::move(x), E{}); 106 std::tuple<int&&, int> t2(std::move(y), 44); 107 t = std::move(t2); 108 assert(std::get<0>(t) == 43); 109 assert(&std::get<0>(t) == &x); 110 } 111 112 return 0; 113 } 114