1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <utility>
// template <class T>
// typename conditional
// <
// !is_nothrow_move_constructible<T>::value && is_copy_constructible<T>::value,
// const T&,
// T&&
// >::type
// move_if_noexcept(T& x);
#include <utility>
#include "test_macros.h"
class A
{
A(const A&);
A& operator=(const A&);
public:
A() {}
#if TEST_STD_VER >= 11
A(A&&) {}
#endif
};
struct legacy
{
legacy() {}
legacy(const legacy&);
};
int main()
{
int i = 0;
const int ci = 0;
legacy l;
A a;
const A ca;
#if TEST_STD_VER >= 11
static_assert((std::is_same<decltype(std::move_if_noexcept(i)), int&&>::value), "");
static_assert((std::is_same<decltype(std::move_if_noexcept(ci)), const int&&>::value), "");
static_assert((std::is_same<decltype(std::move_if_noexcept(a)), A&&>::value), "");
static_assert((std::is_same<decltype(std::move_if_noexcept(ca)), const A&&>::value), "");
static_assert((std::is_same<decltype(std::move_if_noexcept(l)), const legacy&>::value), "");
#else // C++ < 11
// In C++03 libc++ #define's decltype to be __decltype on clang and
// __typeof__ for other compilers. __typeof__ does not deduce the reference
// qualifiers and will cause this test to fail.
static_assert((std::is_same<decltype(std::move_if_noexcept(i)), const int&>::value), "");
static_assert((std::is_same<decltype(std::move_if_noexcept(ci)), const int&>::value), "");
static_assert((std::is_same<decltype(std::move_if_noexcept(a)), const A&>::value), "");
static_assert((std::is_same<decltype(std::move_if_noexcept(ca)), const A&>::value), "");
static_assert((std::is_same<decltype(std::move_if_noexcept(l)), const legacy&>::value), "");
#endif
#if TEST_STD_VER > 11
constexpr int i1 = 23;
constexpr int i2 = std::move_if_noexcept(i1);
static_assert(i2 == 23, "" );
#endif
}
|
