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
|
// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___EXPECTED_UNEXPECTED_H
#define _LIBCPP___EXPECTED_UNEXPECTED_H
#include <__config>
#include <__type_traits/conjunction.h>
#include <__type_traits/is_array.h>
#include <__type_traits/is_const.h>
#include <__type_traits/is_constructible.h>
#include <__type_traits/is_nothrow_constructible.h>
#include <__type_traits/is_object.h>
#include <__type_traits/is_same.h>
#include <__type_traits/is_swappable.h>
#include <__type_traits/is_volatile.h>
#include <__type_traits/negation.h>
#include <__type_traits/remove_cvref.h>
#include <__utility/forward.h>
#include <__utility/in_place.h>
#include <__utility/move.h>
#include <__utility/swap.h>
#include <initializer_list>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
#if _LIBCPP_STD_VER >= 20
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _Err>
class unexpected;
template <class _Tp>
struct __is_std_unexpected : false_type {};
template <class _Err>
struct __is_std_unexpected<unexpected<_Err>> : true_type {};
template <class _Tp>
using __valid_std_unexpected = _BoolConstant< //
is_object_v<_Tp> && //
!is_array_v<_Tp> && //
!__is_std_unexpected<_Tp>::value && //
!is_const_v<_Tp> && //
!is_volatile_v<_Tp> //
>;
template <class _Err>
class unexpected {
static_assert(__valid_std_unexpected<_Err>::value,
"[expected.un.general] states a program that instantiates std::unexpected for a non-object type, an "
"array type, a specialization of unexpected, or a cv-qualified type is ill-formed.");
public:
_LIBCPP_HIDE_FROM_ABI constexpr unexpected(const unexpected&) = default;
_LIBCPP_HIDE_FROM_ABI constexpr unexpected(unexpected&&) = default;
template <class _Error = _Err>
requires(!is_same_v<remove_cvref_t<_Error>, unexpected> && //
!is_same_v<remove_cvref_t<_Error>, in_place_t> && //
is_constructible_v<_Err, _Error>)
_LIBCPP_HIDE_FROM_ABI constexpr explicit unexpected(_Error&& __error) //
noexcept(is_nothrow_constructible_v<_Err, _Error>) // strengthened
: __unex_(std::forward<_Error>(__error)) {}
template <class... _Args>
requires is_constructible_v<_Err, _Args...>
_LIBCPP_HIDE_FROM_ABI constexpr explicit unexpected(in_place_t, _Args&&... __args) //
noexcept(is_nothrow_constructible_v<_Err, _Args...>) // strengthened
: __unex_(std::forward<_Args>(__args)...) {}
template <class _Up, class... _Args>
requires is_constructible_v<_Err, initializer_list<_Up>&, _Args...>
_LIBCPP_HIDE_FROM_ABI constexpr explicit unexpected(in_place_t, initializer_list<_Up> __il, _Args&&... __args) //
noexcept(is_nothrow_constructible_v<_Err, initializer_list<_Up>&, _Args...>) // strengthened
: __unex_(__il, std::forward<_Args>(__args)...) {}
_LIBCPP_HIDE_FROM_ABI constexpr unexpected& operator=(const unexpected&) = default;
_LIBCPP_HIDE_FROM_ABI constexpr unexpected& operator=(unexpected&&) = default;
_LIBCPP_HIDE_FROM_ABI constexpr const _Err& error() const& noexcept { return __unex_; }
_LIBCPP_HIDE_FROM_ABI constexpr _Err& error() & noexcept { return __unex_; }
_LIBCPP_HIDE_FROM_ABI constexpr const _Err&& error() const&& noexcept { return std::move(__unex_); }
_LIBCPP_HIDE_FROM_ABI constexpr _Err&& error() && noexcept { return std::move(__unex_); }
_LIBCPP_HIDE_FROM_ABI constexpr void swap(unexpected& __other) noexcept(is_nothrow_swappable_v<_Err>) {
static_assert(is_swappable_v<_Err>, "unexpected::swap requires is_swappable_v<E> to be true");
using std::swap;
swap(__unex_, __other.__unex_);
}
_LIBCPP_HIDE_FROM_ABI friend constexpr void swap(unexpected& __x, unexpected& __y) noexcept(noexcept(__x.swap(__y)))
requires is_swappable_v<_Err>
{
__x.swap(__y);
}
template <class _Err2>
_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(const unexpected& __x, const unexpected<_Err2>& __y) {
return __x.__unex_ == __y.__unex_;
}
private:
_Err __unex_;
};
template <class _Err>
unexpected(_Err) -> unexpected<_Err>;
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_STD_VER >= 23
_LIBCPP_POP_MACROS
#endif // _LIBCPP___EXPECTED_UNEXPECTED_H
|
