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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___CXX03___SYSTEM_ERROR_ERROR_CODE_H
11#define _LIBCPP___CXX03___SYSTEM_ERROR_ERROR_CODE_H
12
13#include <__cxx03/__config>
14#include <__cxx03/__functional/hash.h>
15#include <__cxx03/__functional/unary_function.h>
16#include <__cxx03/__system_error/errc.h>
17#include <__cxx03/__system_error/error_category.h>
18#include <__cxx03/__system_error/error_condition.h>
19#include <__cxx03/cstddef>
20#include <__cxx03/string>
21
22#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
23# pragma GCC system_header
24#endif
25
26_LIBCPP_BEGIN_NAMESPACE_STD
27
28template <class _Tp>
29struct _LIBCPP_TEMPLATE_VIS is_error_code_enum : public false_type {};
30
31namespace __adl_only {
32// Those cause ADL to trigger but they are not viable candidates,
33// so they are never actually selected.
34void make_error_code() = delete;
35} // namespace __adl_only
36
37class _LIBCPP_EXPORTED_FROM_ABI error_code {
38 int __val_;
39 const error_category* __cat_;
40
41public:
42 _LIBCPP_HIDE_FROM_ABI error_code() _NOEXCEPT : __val_(0), __cat_(&system_category()) {}
43
44 _LIBCPP_HIDE_FROM_ABI error_code(int __val, const error_category& __cat) _NOEXCEPT : __val_(__val), __cat_(&__cat) {}
45
46 template <class _Ep, __enable_if_t<is_error_code_enum<_Ep>::value, int> = 0>
47 _LIBCPP_HIDE_FROM_ABI error_code(_Ep __e) _NOEXCEPT {
48 using __adl_only::make_error_code;
49 *this = make_error_code(__e);
50 }
51
52 _LIBCPP_HIDE_FROM_ABI void assign(int __val, const error_category& __cat) _NOEXCEPT {
53 __val_ = __val;
54 __cat_ = &__cat;
55 }
56
57 template <class _Ep, __enable_if_t<is_error_code_enum<_Ep>::value, int> = 0>
58 _LIBCPP_HIDE_FROM_ABI error_code& operator=(_Ep __e) _NOEXCEPT {
59 using __adl_only::make_error_code;
60 *this = make_error_code(__e);
61 return *this;
62 }
63
64 _LIBCPP_HIDE_FROM_ABI void clear() _NOEXCEPT {
65 __val_ = 0;
66 __cat_ = &system_category();
67 }
68
69 _LIBCPP_HIDE_FROM_ABI int value() const _NOEXCEPT { return __val_; }
70
71 _LIBCPP_HIDE_FROM_ABI const error_category& category() const _NOEXCEPT { return *__cat_; }
72
73 _LIBCPP_HIDE_FROM_ABI error_condition default_error_condition() const _NOEXCEPT {
74 return __cat_->default_error_condition(__val_);
75 }
76
77 string message() const;
78
79 _LIBCPP_HIDE_FROM_ABI explicit operator bool() const _NOEXCEPT { return __val_ != 0; }
80};
81
82inline _LIBCPP_HIDE_FROM_ABI error_code make_error_code(errc __e) _NOEXCEPT {
83 return error_code(static_cast<int>(__e), generic_category());
84}
85
86inline _LIBCPP_HIDE_FROM_ABI bool operator==(const error_code& __x, const error_code& __y) _NOEXCEPT {
87 return __x.category() == __y.category() && __x.value() == __y.value();
88}
89
90inline _LIBCPP_HIDE_FROM_ABI bool operator==(const error_code& __x, const error_condition& __y) _NOEXCEPT {
91 return __x.category().equivalent(__x.value(), __y) || __y.category().equivalent(__x, __y.value());
92}
93
94inline _LIBCPP_HIDE_FROM_ABI bool operator==(const error_condition& __x, const error_code& __y) _NOEXCEPT {
95 return __y == __x;
96}
97
98inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const error_code& __x, const error_code& __y) _NOEXCEPT {
99 return !(__x == __y);
100}
101
102inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const error_code& __x, const error_condition& __y) _NOEXCEPT {
103 return !(__x == __y);
104}
105
106inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const error_condition& __x, const error_code& __y) _NOEXCEPT {
107 return !(__x == __y);
108}
109
110inline _LIBCPP_HIDE_FROM_ABI bool operator<(const error_code& __x, const error_code& __y) _NOEXCEPT {
111 return __x.category() < __y.category() || (__x.category() == __y.category() && __x.value() < __y.value());
112}
113
114template <>
115struct _LIBCPP_TEMPLATE_VIS hash<error_code> : public __unary_function<error_code, size_t> {
116 _LIBCPP_HIDE_FROM_ABI size_t operator()(const error_code& __ec) const _NOEXCEPT {
117 return static_cast<size_t>(__ec.value());
118 }
119};
120
121_LIBCPP_END_NAMESPACE_STD
122
123#endif // _LIBCPP___CXX03___SYSTEM_ERROR_ERROR_CODE_H
124

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source code of libcxx/include/__cxx03/__system_error/error_code.h