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// tuple(tuple&& u);
14
15// UNSUPPORTED: c++03
16
17#include <tuple>
18#include <utility>
19#include <cassert>
20#include <memory>
21
22#include "test_macros.h"
23#include "MoveOnly.h"
24
25struct ConstructsWithTupleLeaf
26{
27 ConstructsWithTupleLeaf() {}
28
29 ConstructsWithTupleLeaf(ConstructsWithTupleLeaf const &) { assert(false); }
30 ConstructsWithTupleLeaf(ConstructsWithTupleLeaf &&) {}
31
32 template <class T>
33 ConstructsWithTupleLeaf(T) {
34 static_assert(!std::is_same<T, T>::value,
35 "Constructor instantiated for type other than int");
36 }
37};
38
39// move_only type which triggers the empty base optimization
40struct move_only_ebo {
41 move_only_ebo() = default;
42 move_only_ebo(move_only_ebo&&) = default;
43};
44
45// a move_only type which does not trigger the empty base optimization
46struct move_only_large final {
47 move_only_large() : value(42) {}
48 move_only_large(move_only_large&&) = default;
49 int value;
50};
51
52template <class Elem>
53void test_sfinae() {
54 using Tup = std::tuple<Elem>;
55 using Alloc = std::allocator<int>;
56 using Tag = std::allocator_arg_t;
57 // special members
58 {
59 static_assert(std::is_default_constructible<Tup>::value, "");
60 static_assert(std::is_move_constructible<Tup>::value, "");
61 static_assert(!std::is_copy_constructible<Tup>::value, "");
62 static_assert(!std::is_constructible<Tup, Tup&>::value, "");
63 }
64 // args constructors
65 {
66 static_assert(std::is_constructible<Tup, Elem&&>::value, "");
67 static_assert(!std::is_constructible<Tup, Elem const&>::value, "");
68 static_assert(!std::is_constructible<Tup, Elem&>::value, "");
69 }
70 // uses-allocator special member constructors
71 {
72 static_assert(std::is_constructible<Tup, Tag, Alloc>::value, "");
73 static_assert(std::is_constructible<Tup, Tag, Alloc, Tup&&>::value, "");
74 static_assert(!std::is_constructible<Tup, Tag, Alloc, Tup const&>::value, "");
75 static_assert(!std::is_constructible<Tup, Tag, Alloc, Tup &>::value, "");
76 }
77 // uses-allocator args constructors
78 {
79 static_assert(std::is_constructible<Tup, Tag, Alloc, Elem&&>::value, "");
80 static_assert(!std::is_constructible<Tup, Tag, Alloc, Elem const&>::value, "");
81 static_assert(!std::is_constructible<Tup, Tag, Alloc, Elem &>::value, "");
82 }
83}
84
85int main(int, char**)
86{
87 {
88 typedef std::tuple<> T;
89 T t0;
90 T t = std::move(t0);
91 ((void)t); // Prevent unused warning
92 }
93 {
94 typedef std::tuple<MoveOnly> T;
95 T t0(MoveOnly(0));
96 T t = std::move(t0);
97 assert(std::get<0>(t) == 0);
98 }
99 {
100 typedef std::tuple<MoveOnly, MoveOnly> T;
101 T t0(MoveOnly(0), MoveOnly(1));
102 T t = std::move(t0);
103 assert(std::get<0>(t) == 0);
104 assert(std::get<1>(t) == 1);
105 }
106 {
107 typedef std::tuple<MoveOnly, MoveOnly, MoveOnly> T;
108 T t0(MoveOnly(0), MoveOnly(1), MoveOnly(2));
109 T t = std::move(t0);
110 assert(std::get<0>(t) == 0);
111 assert(std::get<1>(t) == 1);
112 assert(std::get<2>(t) == 2);
113 }
114 // A bug in tuple caused __tuple_leaf to use its explicit converting constructor
115 // as its move constructor. This tests that ConstructsWithTupleLeaf is not called
116 // (w/ __tuple_leaf)
117 {
118 typedef std::tuple<ConstructsWithTupleLeaf> d_t;
119 d_t d((ConstructsWithTupleLeaf()));
120 d_t d2(static_cast<d_t &&>(d));
121 }
122 {
123 test_sfinae<move_only_ebo>();
124 test_sfinae<move_only_large>();
125 }
126
127 return 0;
128}
129

source code of libcxx/test/std/utilities/tuple/tuple.tuple/tuple.cnstr/move.pass.cpp