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 // test move
11
12 // UNSUPPORTED: c++98, c++03
13
14 #include <utility>
15 #include <type_traits>
16 #include <cassert>
17
18 #include "test_macros.h"
19
20 class move_only
21 {
22 move_only(const move_only&);
23 move_only& operator=(const move_only&);
24 public:
move_only(move_only &&)25 move_only(move_only&&) {}
operator =(move_only &&)26 move_only& operator=(move_only&&) {return *this;}
27
move_only()28 move_only() {}
29 };
30
source()31 move_only source() {return move_only();}
csource()32 const move_only csource() {return move_only();}
33
test(move_only)34 void test(move_only) {}
35
36 int x = 42;
37 const int& cx = x;
38
39 template <class QualInt>
get()40 QualInt get() noexcept { return static_cast<QualInt>(x); }
41
42
43 int copy_ctor = 0;
44 int move_ctor = 0;
45
46 struct A {
AA47 A() {}
AA48 A(const A&) {++copy_ctor;}
AA49 A(A&&) {++move_ctor;}
50 A& operator=(const A&) = delete;
51 };
52
test_constexpr_move()53 constexpr bool test_constexpr_move() {
54 #if TEST_STD_VER > 11
55 int y = 42;
56 const int cy = y;
57 return std::move(y) == 42
58 && std::move(cy) == 42
59 && std::move(static_cast<int&&>(y)) == 42
60 && std::move(static_cast<int const&&>(y)) == 42;
61 #else
62 return true;
63 #endif
64 }
65
main()66 int main()
67 {
68 { // Test return type and noexcept.
69 static_assert(std::is_same<decltype(std::move(x)), int&&>::value, "");
70 static_assert(noexcept(std::move(x)), "");
71 static_assert(std::is_same<decltype(std::move(cx)), const int&&>::value, "");
72 static_assert(noexcept(std::move(cx)), "");
73 static_assert(std::is_same<decltype(std::move(42)), int&&>::value, "");
74 static_assert(noexcept(std::move(42)), "");
75 static_assert(std::is_same<decltype(std::move(get<const int&&>())), const int&&>::value, "");
76 static_assert(noexcept(std::move(get<int const&&>())), "");
77 }
78 { // test copy and move semantics
79 A a;
80 const A ca = A();
81
82 assert(copy_ctor == 0);
83 assert(move_ctor == 0);
84
85 A a2 = a;
86 assert(copy_ctor == 1);
87 assert(move_ctor == 0);
88
89 A a3 = std::move(a);
90 assert(copy_ctor == 1);
91 assert(move_ctor == 1);
92
93 A a4 = ca;
94 assert(copy_ctor == 2);
95 assert(move_ctor == 1);
96
97 A a5 = std::move(ca);
98 assert(copy_ctor == 3);
99 assert(move_ctor == 1);
100 }
101 { // test on a move only type
102 move_only mo;
103 test(std::move(mo));
104 test(source());
105 }
106 #if TEST_STD_VER > 11
107 {
108 constexpr int y = 42;
109 static_assert(std::move(y) == 42, "");
110 static_assert(test_constexpr_move(), "");
111 }
112 #endif
113 #if TEST_STD_VER == 11 && defined(_LIBCPP_VERSION)
114 // Test that std::forward is constexpr in C++11. This is an extension
115 // provided by both libc++ and libstdc++.
116 {
117 constexpr int y = 42;
118 static_assert(std::move(y) == 42, "");
119 }
120 #endif
121 }
122