xref: /llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/convert_move.pass.cpp (revision 70248920fcd804a5825ecf69f24b96a7e340afe6)
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> tuple(tuple<UTypes...>&& u);
14 
15 // UNSUPPORTED: c++03
16 
17 #include <tuple>
18 #include <string>
19 #include <memory>
20 #include <cassert>
21 
22 #include "test_macros.h"
23 
24 struct Explicit {
25   int value;
ExplicitExplicit26   explicit Explicit(int x) : value(x) {}
27 };
28 
29 struct Implicit {
30   int value;
ImplicitImplicit31   Implicit(int x) : value(x) {}
32 };
33 
34 struct B
35 {
36     int id_;
37 
BB38     explicit B(int i) : id_(i) {}
39     B(const B&) = default;
40     B& operator=(const B&) = default;
~BB41     virtual ~B() {}
42 };
43 
44 struct D
45     : B
46 {
DD47     explicit D(int i) : B(i) {}
48 };
49 
50 struct BonkersBananas {
51   template <class T>
52   operator T() &&;
53   template <class T, class = void>
54   explicit operator T() && = delete;
55 };
56 
test_bonkers_bananas_conversion()57 void test_bonkers_bananas_conversion() {
58   using ReturnType = std::tuple<int, int>;
59   static_assert(std::is_convertible<BonkersBananas, ReturnType>(), "");
60   static_assert(!std::is_constructible<ReturnType, BonkersBananas>(), "");
61 
62 }
63 
main(int,char **)64 int main(int, char**)
65 {
66     {
67         typedef std::tuple<long> T0;
68         typedef std::tuple<long long> T1;
69         T0 t0(2);
70         T1 t1 = std::move(t0);
71         assert(std::get<0>(t1) == 2);
72     }
73     {
74         typedef std::tuple<long, char> T0;
75         typedef std::tuple<long long, int> T1;
76         T0 t0(2, 'a');
77         T1 t1 = std::move(t0);
78         assert(std::get<0>(t1) == 2);
79         assert(std::get<1>(t1) == int('a'));
80     }
81     {
82         typedef std::tuple<long, char, D> T0;
83         typedef std::tuple<long long, int, B> T1;
84         T0 t0(2, 'a', D(3));
85         T1 t1 = std::move(t0);
86         assert(std::get<0>(t1) == 2);
87         assert(std::get<1>(t1) == int('a'));
88         assert(std::get<2>(t1).id_ == 3);
89     }
90     {
91         D d(3);
92         typedef std::tuple<long, char, D&> T0;
93         typedef std::tuple<long long, int, B&> T1;
94         T0 t0(2, 'a', d);
95         T1 t1 = std::move(t0);
96         d.id_ = 2;
97         assert(std::get<0>(t1) == 2);
98         assert(std::get<1>(t1) == int('a'));
99         assert(std::get<2>(t1).id_ == 2);
100     }
101     {
102         typedef std::tuple<long, char, std::unique_ptr<D>> T0;
103         typedef std::tuple<long long, int, std::unique_ptr<B>> T1;
104         T0 t0(2, 'a', std::unique_ptr<D>(new D(3)));
105         T1 t1 = std::move(t0);
106         assert(std::get<0>(t1) == 2);
107         assert(std::get<1>(t1) == int('a'));
108         assert(std::get<2>(t1)->id_ == 3);
109     }
110     {
111         std::tuple<int> t1(42);
112         std::tuple<Explicit> t2(std::move(t1));
113         assert(std::get<0>(t2).value == 42);
114     }
115     {
116         std::tuple<int> t1(42);
117         std::tuple<Implicit> t2 = std::move(t1);
118         assert(std::get<0>(t2).value == 42);
119     }
120 
121   return 0;
122 }
123