blob: 4e2aca978865ba7bdd941a8d2e8adfd3ac66d9d5 (
plain)
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
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
//===----------------------------------------------------------------------===//
//
// 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.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11
// <optional>
// optional<T>& operator=(optional<T>&& rhs)
// noexcept(is_nothrow_move_assignable<T>::value &&
// is_nothrow_move_constructible<T>::value);
#include <experimental/optional>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
using std::experimental::optional;
struct AllowConstAssign {
AllowConstAssign(AllowConstAssign const&) {}
AllowConstAssign const& operator=(AllowConstAssign const&) const {
return *this;
}
};
struct X
{
static bool throw_now;
X() = default;
X(X&&)
{
if (throw_now)
TEST_THROW(6);
}
X& operator=(X&&) noexcept
{
return *this;
}
};
bool X::throw_now = false;
struct Y {};
int main()
{
{
static_assert(std::is_nothrow_move_assignable<optional<int>>::value, "");
optional<int> opt;
constexpr optional<int> opt2;
opt = std::move(opt2);
static_assert(static_cast<bool>(opt2) == false, "");
assert(static_cast<bool>(opt) == static_cast<bool>(opt2));
}
{
optional<int> opt;
constexpr optional<int> opt2(2);
opt = std::move(opt2);
static_assert(static_cast<bool>(opt2) == true, "");
static_assert(*opt2 == 2, "");
assert(static_cast<bool>(opt) == static_cast<bool>(opt2));
assert(*opt == *opt2);
}
{
optional<int> opt(3);
constexpr optional<int> opt2;
opt = std::move(opt2);
static_assert(static_cast<bool>(opt2) == false, "");
assert(static_cast<bool>(opt) == static_cast<bool>(opt2));
}
{
optional<int> opt(3);
constexpr optional<int> opt2(2);
opt = std::move(opt2);
static_assert(static_cast<bool>(opt2) == true, "");
static_assert(*opt2 == 2, "");
assert(static_cast<bool>(opt) == static_cast<bool>(opt2));
assert(*opt == *opt2);
}
{
optional<const AllowConstAssign> opt;
optional<const AllowConstAssign> opt2;
opt = std::move(opt2);
}
#ifndef TEST_HAS_NO_EXCEPTIONS
{
static_assert(!std::is_nothrow_move_assignable<optional<X>>::value, "");
optional<X> opt;
optional<X> opt2(X{});
assert(static_cast<bool>(opt2) == true);
try
{
X::throw_now = true;
opt = std::move(opt2);
assert(false);
}
catch (int i)
{
assert(i == 6);
assert(static_cast<bool>(opt) == false);
}
}
#endif
{
static_assert(std::is_nothrow_move_assignable<optional<Y>>::value, "");
}
}
|
