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_CODE_H
11 #define _LIBCPP___SYSTEM_ERROR_ERROR_CODE_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 <__system_error/error_condition.h>
20 #include <cstddef>
21 #include <string>
22
23 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
24 # pragma GCC system_header
25 #endif
26
27 _LIBCPP_BEGIN_NAMESPACE_STD
28
29 template <class _Tp>
30 struct _LIBCPP_TEMPLATE_VIS is_error_code_enum : public false_type {};
31
32 #if _LIBCPP_STD_VER >= 17
33 template <class _Tp>
34 inline constexpr bool is_error_code_enum_v = is_error_code_enum<_Tp>::value;
35 #endif
36
37 namespace __adl_only {
38 // Those cause ADL to trigger but they are not viable candidates,
39 // so they are never actually selected.
40 void make_error_code() = delete;
41 } // namespace __adl_only
42
43 class _LIBCPP_TYPE_VIS error_code {
44 int __val_;
45 const error_category* __cat_;
46
47 public:
error_code()48 _LIBCPP_HIDE_FROM_ABI error_code() _NOEXCEPT : __val_(0), __cat_(&system_category()) {}
49
error_code(int __val,const error_category & __cat)50 _LIBCPP_HIDE_FROM_ABI error_code(int __val, const error_category& __cat) _NOEXCEPT : __val_(__val), __cat_(&__cat) {}
51
52 template <class _Ep>
53 _LIBCPP_HIDE_FROM_ABI
54 error_code(_Ep __e, typename enable_if<is_error_code_enum<_Ep>::value>::type* = nullptr) _NOEXCEPT {
55 using __adl_only::make_error_code;
56 *this = make_error_code(__e);
57 }
58
assign(int __val,const error_category & __cat)59 _LIBCPP_HIDE_FROM_ABI void assign(int __val, const error_category& __cat) _NOEXCEPT {
60 __val_ = __val;
61 __cat_ = &__cat;
62 }
63
64 template <class _Ep>
65 _LIBCPP_HIDE_FROM_ABI typename enable_if< is_error_code_enum<_Ep>::value, error_code& >::type
66 operator=(_Ep __e) _NOEXCEPT {
67 using __adl_only::make_error_code;
68 *this = make_error_code(__e);
69 return *this;
70 }
71
clear()72 _LIBCPP_HIDE_FROM_ABI void clear() _NOEXCEPT {
73 __val_ = 0;
74 __cat_ = &system_category();
75 }
76
value()77 _LIBCPP_HIDE_FROM_ABI int value() const _NOEXCEPT { return __val_; }
78
category()79 _LIBCPP_HIDE_FROM_ABI const error_category& category() const _NOEXCEPT { return *__cat_; }
80
default_error_condition()81 _LIBCPP_HIDE_FROM_ABI error_condition default_error_condition() const _NOEXCEPT {
82 return __cat_->default_error_condition(__val_);
83 }
84
85 string message() const;
86
87 _LIBCPP_HIDE_FROM_ABI explicit operator bool() const _NOEXCEPT { return __val_ != 0; }
88 };
89
make_error_code(errc __e)90 inline _LIBCPP_HIDE_FROM_ABI error_code make_error_code(errc __e) _NOEXCEPT {
91 return error_code(static_cast<int>(__e), generic_category());
92 }
93
94 inline _LIBCPP_HIDE_FROM_ABI bool operator==(const error_code& __x, const error_code& __y) _NOEXCEPT {
95 return __x.category() == __y.category() && __x.value() == __y.value();
96 }
97
98 inline _LIBCPP_HIDE_FROM_ABI bool operator==(const error_code& __x, const error_condition& __y) _NOEXCEPT {
99 return __x.category().equivalent(__x.value(), __y) || __y.category().equivalent(__x, __y.value());
100 }
101
102 #if _LIBCPP_STD_VER <= 17
103 inline _LIBCPP_HIDE_FROM_ABI bool operator==(const error_condition& __x, const error_code& __y) _NOEXCEPT {
104 return __y == __x;
105 }
106 #endif
107
108 #if _LIBCPP_STD_VER <= 17
109
110 inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const error_code& __x, const error_code& __y) _NOEXCEPT {
111 return !(__x == __y);
112 }
113
114 inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const error_code& __x, const error_condition& __y) _NOEXCEPT {
115 return !(__x == __y);
116 }
117
118 inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const error_condition& __x, const error_code& __y) _NOEXCEPT {
119 return !(__x == __y);
120 }
121
122 inline _LIBCPP_HIDE_FROM_ABI bool operator<(const error_code& __x, const error_code& __y) _NOEXCEPT {
123 return __x.category() < __y.category() || (__x.category() == __y.category() && __x.value() < __y.value());
124 }
125
126 #else // _LIBCPP_STD_VER <= 17
127
128 inline _LIBCPP_HIDE_FROM_ABI strong_ordering operator<=>(const error_code& __x, const error_code& __y) noexcept {
129 if (auto __c = __x.category() <=> __y.category(); __c != 0)
130 return __c;
131 return __x.value() <=> __y.value();
132 }
133
134 #endif // _LIBCPP_STD_VER <= 17
135
136 template <>
137 struct _LIBCPP_TEMPLATE_VIS hash<error_code> : public __unary_function<error_code, size_t> {
138 _LIBCPP_HIDE_FROM_ABI size_t operator()(const error_code& __ec) const _NOEXCEPT {
139 return static_cast<size_t>(__ec.value());
140 }
141 };
142
143 _LIBCPP_END_NAMESPACE_STD
144
145 #endif // _LIBCPP___SYSTEM_ERROR_ERROR_CODE_H
146