Warning: This file is not a C or C++ file. It does not have highlighting.

1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP___SYSTEM_ERROR_ERROR_CONDITION_H
11#define _LIBCPP___SYSTEM_ERROR_ERROR_CONDITION_H
12
13#include <__compare/ordering.h>
14#include <__config>
15#include <__functional/hash.h>
16#include <__functional/unary_function.h>
17#include <__system_error/errc.h>
18#include <__system_error/error_category.h>
19#include <string>
20
21#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
22# pragma GCC system_header
23#endif
24
25_LIBCPP_BEGIN_NAMESPACE_STD
26
27template <class _Tp>
28struct is_error_condition_enum : public false_type {};
29
30#if _LIBCPP_STD_VER >= 17
31template <class _Tp>
32inline constexpr bool is_error_condition_enum_v = is_error_condition_enum<_Tp>::value;
33#endif
34
35template <>
36struct is_error_condition_enum<errc> : true_type {};
37
38#ifdef _LIBCPP_CXX03_LANG
39template <>
40struct is_error_condition_enum<errc::__lx> : true_type {};
41#endif
42
43namespace __adl_only {
44// Those cause ADL to trigger but they are not viable candidates,
45// so they are never actually selected.
46void make_error_condition() = delete;
47} // namespace __adl_only
48
49class _LIBCPP_EXPORTED_FROM_ABI error_condition {
50 int __val_;
51 const error_category* __cat_;
52
53public:
54 _LIBCPP_HIDE_FROM_ABI error_condition() _NOEXCEPT : __val_(0), __cat_(&generic_category()) {}
55
56 _LIBCPP_HIDE_FROM_ABI error_condition(int __val, const error_category& __cat) _NOEXCEPT
57 : __val_(__val),
58 __cat_(&__cat) {}
59
60 template <class _Ep, __enable_if_t<is_error_condition_enum<_Ep>::value, int> = 0>
61 _LIBCPP_HIDE_FROM_ABI error_condition(_Ep __e) _NOEXCEPT {
62 using __adl_only::make_error_condition;
63 *this = make_error_condition(__e);
64 }
65
66 _LIBCPP_HIDE_FROM_ABI void assign(int __val, const error_category& __cat) _NOEXCEPT {
67 __val_ = __val;
68 __cat_ = &__cat;
69 }
70
71 template <class _Ep, __enable_if_t<is_error_condition_enum<_Ep>::value, int> = 0>
72 _LIBCPP_HIDE_FROM_ABI error_condition& operator=(_Ep __e) _NOEXCEPT {
73 using __adl_only::make_error_condition;
74 *this = make_error_condition(__e);
75 return *this;
76 }
77
78 _LIBCPP_HIDE_FROM_ABI void clear() _NOEXCEPT {
79 __val_ = 0;
80 __cat_ = &generic_category();
81 }
82
83 _LIBCPP_HIDE_FROM_ABI int value() const _NOEXCEPT { return __val_; }
84
85 _LIBCPP_HIDE_FROM_ABI const error_category& category() const _NOEXCEPT { return *__cat_; }
86 string message() const;
87
88 _LIBCPP_HIDE_FROM_ABI explicit operator bool() const _NOEXCEPT { return __val_ != 0; }
89};
90
91inline _LIBCPP_HIDE_FROM_ABI error_condition make_error_condition(errc __e) _NOEXCEPT {
92 return error_condition(static_cast<int>(__e), generic_category());
93}
94
95inline _LIBCPP_HIDE_FROM_ABI bool operator==(const error_condition& __x, const error_condition& __y) _NOEXCEPT {
96 return __x.category() == __y.category() && __x.value() == __y.value();
97}
98
99#if _LIBCPP_STD_VER <= 17
100
101inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const error_condition& __x, const error_condition& __y) _NOEXCEPT {
102 return !(__x == __y);
103}
104
105inline _LIBCPP_HIDE_FROM_ABI bool operator<(const error_condition& __x, const error_condition& __y) _NOEXCEPT {
106 return __x.category() < __y.category() || (__x.category() == __y.category() && __x.value() < __y.value());
107}
108
109#else // _LIBCPP_STD_VER <= 17
110
111inline _LIBCPP_HIDE_FROM_ABI strong_ordering
112operator<=>(const error_condition& __x, const error_condition& __y) noexcept {
113 if (auto __c = __x.category() <=> __y.category(); __c != 0)
114 return __c;
115 return __x.value() <=> __y.value();
116}
117
118#endif // _LIBCPP_STD_VER <= 17
119
120template <>
121struct hash<error_condition> : public __unary_function<error_condition, size_t> {
122 _LIBCPP_HIDE_FROM_ABI size_t operator()(const error_condition& __ec) const _NOEXCEPT {
123 return static_cast<size_t>(__ec.value());
124 }
125};
126
127_LIBCPP_END_NAMESPACE_STD
128
129#endif // _LIBCPP___SYSTEM_ERROR_ERROR_CONDITION_H
130

Warning: This file is not a C or C++ file. It does not have highlighting.

source code of libcxx/include/__system_error/error_condition.h