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
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: c++03, c++11, c++14
// Throwing bad_optional_access is supported starting in macosx10.13
// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
// <optional>
// template <class U>
// constexpr EXPLICIT optional(U&& u);
#include <optional>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
#include "archetypes.h"
#include "test_convertible.h"
using std::optional;
struct ImplicitThrow
{
constexpr ImplicitThrow(int x) { if (x != -1) TEST_THROW(6);}
};
struct ExplicitThrow
{
constexpr explicit ExplicitThrow(int x) { if (x != -1) TEST_THROW(6);}
};
struct ImplicitAny {
template <class U>
constexpr ImplicitAny(U&&) {}
};
template <class To, class From>
constexpr bool implicit_conversion(optional<To>&& opt, const From& v)
{
using O = optional<To>;
static_assert(test_convertible<O, From>(), "");
static_assert(!test_convertible<O, void*>(), "");
static_assert(!test_convertible<O, From, int>(), "");
return opt && *opt == static_cast<To>(v);
}
template <class To, class Input, class Expect>
constexpr bool explicit_conversion(Input&& in, const Expect& v)
{
using O = optional<To>;
static_assert(std::is_constructible<O, Input>::value, "");
static_assert(!std::is_convertible<Input, O>::value, "");
static_assert(!std::is_constructible<O, void*>::value, "");
static_assert(!std::is_constructible<O, Input, int>::value, "");
optional<To> opt(std::forward<Input>(in));
return opt && *opt == static_cast<To>(v);
}
void test_implicit()
{
{
static_assert(implicit_conversion<long long>(42, 42), "");
}
{
static_assert(implicit_conversion<long double>(3.14, 3.14), "");
}
{
int x = 42;
optional<void* const> o(&x);
assert(*o == &x);
}
{
using T = TrivialTestTypes::TestType;
static_assert(implicit_conversion<T>(42, 42), "");
}
{
using T = TestTypes::TestType;
assert(implicit_conversion<T>(3, T(3)));
}
{
using O = optional<ImplicitAny>;
static_assert(!test_convertible<O, std::in_place_t>(), "");
static_assert(!test_convertible<O, std::in_place_t&>(), "");
static_assert(!test_convertible<O, const std::in_place_t&>(), "");
static_assert(!test_convertible<O, std::in_place_t&&>(), "");
static_assert(!test_convertible<O, const std::in_place_t&&>(), "");
}
#ifndef TEST_HAS_NO_EXCEPTIONS
{
try {
using T = ImplicitThrow;
optional<T> t = 42;
assert(false);
((void)t);
} catch (int) {
}
}
#endif
}
void test_explicit() {
{
using T = ExplicitTrivialTestTypes::TestType;
static_assert(explicit_conversion<T>(42, 42), "");
}
{
using T = ExplicitConstexprTestTypes::TestType;
static_assert(explicit_conversion<T>(42, 42), "");
static_assert(!std::is_convertible<int, T>::value, "");
}
{
using T = ExplicitTestTypes::TestType;
T::reset();
{
assert(explicit_conversion<T>(42, 42));
assert(T::alive == 0);
}
T::reset();
{
optional<T> t(42);
assert(T::alive == 1);
assert(T::value_constructed == 1);
assert(T::move_constructed == 0);
assert(T::copy_constructed == 0);
assert(t.value().value == 42);
}
assert(T::alive == 0);
}
#ifndef TEST_HAS_NO_EXCEPTIONS
{
try {
using T = ExplicitThrow;
optional<T> t(42);
assert(false);
} catch (int) {
}
}
#endif
}
int main(int, char**) {
test_implicit();
test_explicit();
return 0;
}
|
