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
21 #include "test_macros.h"
22 #include "MoveOnly.h"
23
24 struct ConstructsWithTupleLeaf
25 {
ConstructsWithTupleLeafConstructsWithTupleLeaf26 ConstructsWithTupleLeaf() {}
27
ConstructsWithTupleLeafConstructsWithTupleLeaf28 ConstructsWithTupleLeaf(ConstructsWithTupleLeaf const &) { assert(false); }
ConstructsWithTupleLeafConstructsWithTupleLeaf29 ConstructsWithTupleLeaf(ConstructsWithTupleLeaf &&) {}
30
31 template <class T>
ConstructsWithTupleLeafConstructsWithTupleLeaf32 ConstructsWithTupleLeaf(T) {
33 static_assert(!std::is_same<T, T>::value,
34 "Constructor instantiated for type other than int");
35 }
36 };
37
38 // move_only type which triggers the empty base optimization
39 struct move_only_ebo {
40 move_only_ebo() = default;
41 move_only_ebo(move_only_ebo&&) = default;
42 };
43
44 // a move_only type which does not trigger the empty base optimization
45 struct move_only_large final {
move_only_largemove_only_large46 move_only_large() : value(42) {}
47 move_only_large(move_only_large&&) = default;
48 int value;
49 };
50
51 template <class Elem>
test_sfinae()52 void test_sfinae() {
53 using Tup = std::tuple<Elem>;
54 using Alloc = std::allocator<int>;
55 using Tag = std::allocator_arg_t;
56 // special members
57 {
58 static_assert(std::is_default_constructible<Tup>::value, "");
59 static_assert(std::is_move_constructible<Tup>::value, "");
60 static_assert(!std::is_copy_constructible<Tup>::value, "");
61 static_assert(!std::is_constructible<Tup, Tup&>::value, "");
62 }
63 // args constructors
64 {
65 static_assert(std::is_constructible<Tup, Elem&&>::value, "");
66 static_assert(!std::is_constructible<Tup, Elem const&>::value, "");
67 static_assert(!std::is_constructible<Tup, Elem&>::value, "");
68 }
69 // uses-allocator special member constructors
70 {
71 static_assert(std::is_constructible<Tup, Tag, Alloc>::value, "");
72 static_assert(std::is_constructible<Tup, Tag, Alloc, Tup&&>::value, "");
73 static_assert(!std::is_constructible<Tup, Tag, Alloc, Tup const&>::value, "");
74 static_assert(!std::is_constructible<Tup, Tag, Alloc, Tup &>::value, "");
75 }
76 // uses-allocator args constructors
77 {
78 static_assert(std::is_constructible<Tup, Tag, Alloc, Elem&&>::value, "");
79 static_assert(!std::is_constructible<Tup, Tag, Alloc, Elem const&>::value, "");
80 static_assert(!std::is_constructible<Tup, Tag, Alloc, Elem &>::value, "");
81 }
82 }
83
main(int,char **)84 int main(int, char**)
85 {
86 {
87 typedef std::tuple<> T;
88 T t0;
89 T t = std::move(t0);
90 ((void)t); // Prevent unused warning
91 }
92 {
93 typedef std::tuple<MoveOnly> T;
94 T t0(MoveOnly(0));
95 T t = std::move(t0);
96 assert(std::get<0>(t) == 0);
97 }
98 {
99 typedef std::tuple<MoveOnly, MoveOnly> T;
100 T t0(MoveOnly(0), MoveOnly(1));
101 T t = std::move(t0);
102 assert(std::get<0>(t) == 0);
103 assert(std::get<1>(t) == 1);
104 }
105 {
106 typedef std::tuple<MoveOnly, MoveOnly, MoveOnly> T;
107 T t0(MoveOnly(0), MoveOnly(1), MoveOnly(2));
108 T t = std::move(t0);
109 assert(std::get<0>(t) == 0);
110 assert(std::get<1>(t) == 1);
111 assert(std::get<2>(t) == 2);
112 }
113 // A bug in tuple caused __tuple_leaf to use its explicit converting constructor
114 // as its move constructor. This tests that ConstructsWithTupleLeaf is not called
115 // (w/ __tuple_leaf)
116 {
117 typedef std::tuple<ConstructsWithTupleLeaf> d_t;
118 d_t d((ConstructsWithTupleLeaf()));
119 d_t d2(static_cast<d_t &&>(d));
120 }
121 {
122 test_sfinae<move_only_ebo>();
123 test_sfinae<move_only_large>();
124 }
125
126 return 0;
127 }
128