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1 // -*- C++ -*-
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2 //===---------------------------- system_error ----------------------------===//
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3 //
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4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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5 // See https://llvm.org/LICENSE.txt for license information.
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6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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7 //
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8 //===----------------------------------------------------------------------===//
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9
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10 #ifndef _LIBCPP_SYSTEM_ERROR
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11 #define _LIBCPP_SYSTEM_ERROR
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12
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13 /*
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14 system_error synopsis
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15
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16 namespace std
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17 {
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18
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19 class error_category
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20 {
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21 public:
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22 virtual ~error_category() noexcept;
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23
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24 constexpr error_category();
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25 error_category(const error_category&) = delete;
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26 error_category& operator=(const error_category&) = delete;
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27
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28 virtual const char* name() const noexcept = 0;
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29 virtual error_condition default_error_condition(int ev) const noexcept;
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30 virtual bool equivalent(int code, const error_condition& condition) const noexcept;
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31 virtual bool equivalent(const error_code& code, int condition) const noexcept;
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32 virtual string message(int ev) const = 0;
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33
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34 bool operator==(const error_category& rhs) const noexcept;
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35 bool operator!=(const error_category& rhs) const noexcept;
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36 bool operator<(const error_category& rhs) const noexcept;
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37 };
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38
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39 const error_category& generic_category() noexcept;
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40 const error_category& system_category() noexcept;
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41
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42 template <class T> struct is_error_code_enum
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43 : public false_type {};
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44
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45 template <class T> struct is_error_condition_enum
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46 : public false_type {};
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47
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48 template <class _Tp>
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49 inline constexpr size_t is_error_condition_enum_v = is_error_condition_enum<_Tp>::value; // C++17
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50
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51 template <class _Tp>
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52 inline constexpr size_t is_error_code_enum_v = is_error_code_enum<_Tp>::value; // C++17
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53
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54 class error_code
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55 {
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56 public:
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57 // constructors:
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58 error_code() noexcept;
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59 error_code(int val, const error_category& cat) noexcept;
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60 template <class ErrorCodeEnum>
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61 error_code(ErrorCodeEnum e) noexcept;
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62
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63 // modifiers:
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64 void assign(int val, const error_category& cat) noexcept;
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65 template <class ErrorCodeEnum>
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66 error_code& operator=(ErrorCodeEnum e) noexcept;
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67 void clear() noexcept;
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68
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69 // observers:
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70 int value() const noexcept;
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71 const error_category& category() const noexcept;
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72 error_condition default_error_condition() const noexcept;
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73 string message() const;
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74 explicit operator bool() const noexcept;
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75 };
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76
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77 // non-member functions:
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78 bool operator<(const error_code& lhs, const error_code& rhs) noexcept;
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79 template <class charT, class traits>
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80 basic_ostream<charT,traits>&
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81 operator<<(basic_ostream<charT,traits>& os, const error_code& ec);
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82
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83 class error_condition
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84 {
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85 public:
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86 // constructors:
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87 error_condition() noexcept;
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88 error_condition(int val, const error_category& cat) noexcept;
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89 template <class ErrorConditionEnum>
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90 error_condition(ErrorConditionEnum e) noexcept;
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91
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92 // modifiers:
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93 void assign(int val, const error_category& cat) noexcept;
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94 template <class ErrorConditionEnum>
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95 error_condition& operator=(ErrorConditionEnum e) noexcept;
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96 void clear() noexcept;
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97
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98 // observers:
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99 int value() const noexcept;
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100 const error_category& category() const noexcept;
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101 string message() const noexcept;
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102 explicit operator bool() const noexcept;
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103 };
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104
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105 bool operator<(const error_condition& lhs, const error_condition& rhs) noexcept;
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106
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107 class system_error
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108 : public runtime_error
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109 {
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110 public:
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111 system_error(error_code ec, const string& what_arg);
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112 system_error(error_code ec, const char* what_arg);
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113 system_error(error_code ec);
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114 system_error(int ev, const error_category& ecat, const string& what_arg);
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115 system_error(int ev, const error_category& ecat, const char* what_arg);
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116 system_error(int ev, const error_category& ecat);
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117
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118 const error_code& code() const noexcept;
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119 const char* what() const noexcept;
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120 };
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121
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122 template <> struct is_error_condition_enum<errc>
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123 : true_type { }
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124
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125 error_code make_error_code(errc e) noexcept;
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126 error_condition make_error_condition(errc e) noexcept;
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127
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128 // Comparison operators:
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129 bool operator==(const error_code& lhs, const error_code& rhs) noexcept;
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130 bool operator==(const error_code& lhs, const error_condition& rhs) noexcept;
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131 bool operator==(const error_condition& lhs, const error_code& rhs) noexcept;
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132 bool operator==(const error_condition& lhs, const error_condition& rhs) noexcept;
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133 bool operator!=(const error_code& lhs, const error_code& rhs) noexcept;
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134 bool operator!=(const error_code& lhs, const error_condition& rhs) noexcept;
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135 bool operator!=(const error_condition& lhs, const error_code& rhs) noexcept;
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136 bool operator!=(const error_condition& lhs, const error_condition& rhs) noexcept;
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137
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138 template <> struct hash<std::error_code>;
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139 template <> struct hash<std::error_condition>;
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140
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141 } // std
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142
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143 */
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144
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145 #include <__errc>
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146 #include <type_traits>
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147 #include <stdexcept>
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148 #include <__functional_base>
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149 #include <string>
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150
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151 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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152 #pragma GCC system_header
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153 #endif
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154
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155 _LIBCPP_BEGIN_NAMESPACE_STD
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156
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157 // is_error_code_enum
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158
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159 template <class _Tp>
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160 struct _LIBCPP_TEMPLATE_VIS is_error_code_enum
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161 : public false_type {};
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162
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163 #if _LIBCPP_STD_VER > 14
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164 template <class _Tp>
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165 _LIBCPP_INLINE_VAR constexpr size_t is_error_code_enum_v = is_error_code_enum<_Tp>::value;
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166 #endif
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167
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168 // is_error_condition_enum
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169
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170 template <class _Tp>
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171 struct _LIBCPP_TEMPLATE_VIS is_error_condition_enum
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172 : public false_type {};
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173
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174 #if _LIBCPP_STD_VER > 14
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175 template <class _Tp>
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176 _LIBCPP_INLINE_VAR constexpr size_t is_error_condition_enum_v = is_error_condition_enum<_Tp>::value;
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177 #endif
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178
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179 template <>
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180 struct _LIBCPP_TEMPLATE_VIS is_error_condition_enum<errc>
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181 : true_type { };
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182
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183 #ifdef _LIBCPP_HAS_NO_STRONG_ENUMS
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184 template <>
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185 struct _LIBCPP_TEMPLATE_VIS is_error_condition_enum<errc::__lx>
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186 : true_type { };
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187 #endif
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188
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189 class _LIBCPP_TYPE_VIS error_condition;
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190 class _LIBCPP_TYPE_VIS error_code;
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191
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192 // class error_category
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193
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194 class _LIBCPP_HIDDEN __do_message;
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195
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196 class _LIBCPP_TYPE_VIS error_category
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197 {
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198 public:
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199 virtual ~error_category() _NOEXCEPT;
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200
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201 #if defined(_LIBCPP_BUILDING_LIBRARY) && \
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202 defined(_LIBCPP_DEPRECATED_ABI_LEGACY_LIBRARY_DEFINITIONS_FOR_INLINE_FUNCTIONS)
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203 error_category() _NOEXCEPT;
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204 #else
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205 _LIBCPP_INLINE_VISIBILITY
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206 _LIBCPP_CONSTEXPR_AFTER_CXX11 error_category() _NOEXCEPT _LIBCPP_DEFAULT
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207 #endif
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208 private:
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209 error_category(const error_category&);// = delete;
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210 error_category& operator=(const error_category&);// = delete;
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211
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212 public:
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213 virtual const char* name() const _NOEXCEPT = 0;
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214 virtual error_condition default_error_condition(int __ev) const _NOEXCEPT;
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215 virtual bool equivalent(int __code, const error_condition& __condition) const _NOEXCEPT;
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216 virtual bool equivalent(const error_code& __code, int __condition) const _NOEXCEPT;
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217 virtual string message(int __ev) const = 0;
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218
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219 _LIBCPP_INLINE_VISIBILITY
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220 bool operator==(const error_category& __rhs) const _NOEXCEPT {return this == &__rhs;}
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221
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222 _LIBCPP_INLINE_VISIBILITY
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223 bool operator!=(const error_category& __rhs) const _NOEXCEPT {return !(*this == __rhs);}
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224
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225 _LIBCPP_INLINE_VISIBILITY
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226 bool operator< (const error_category& __rhs) const _NOEXCEPT {return this < &__rhs;}
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227
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228 friend class _LIBCPP_HIDDEN __do_message;
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229 };
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230
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231 class _LIBCPP_HIDDEN __do_message
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232 : public error_category
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233 {
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234 public:
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235 virtual string message(int ev) const;
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236 };
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237
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238 _LIBCPP_FUNC_VIS const error_category& generic_category() _NOEXCEPT;
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239 _LIBCPP_FUNC_VIS const error_category& system_category() _NOEXCEPT;
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240
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241 class _LIBCPP_TYPE_VIS error_condition
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242 {
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243 int __val_;
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244 const error_category* __cat_;
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245 public:
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246 _LIBCPP_INLINE_VISIBILITY
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247 error_condition() _NOEXCEPT : __val_(0), __cat_(&generic_category()) {}
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248
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249 _LIBCPP_INLINE_VISIBILITY
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250 error_condition(int __val, const error_category& __cat) _NOEXCEPT
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251 : __val_(__val), __cat_(&__cat) {}
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252
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253 template <class _Ep>
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254 _LIBCPP_INLINE_VISIBILITY
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255 error_condition(_Ep __e,
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256 typename enable_if<is_error_condition_enum<_Ep>::value>::type* = 0
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257 ) _NOEXCEPT
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258 {*this = make_error_condition(__e);}
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259
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260 _LIBCPP_INLINE_VISIBILITY
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261 void assign(int __val, const error_category& __cat) _NOEXCEPT
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262 {
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263 __val_ = __val;
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264 __cat_ = &__cat;
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265 }
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266
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267 template <class _Ep>
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268 _LIBCPP_INLINE_VISIBILITY
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269 typename enable_if
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270 <
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271 is_error_condition_enum<_Ep>::value,
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272 error_condition&
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273 >::type
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274 operator=(_Ep __e) _NOEXCEPT
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275 {*this = make_error_condition(__e); return *this;}
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276
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277 _LIBCPP_INLINE_VISIBILITY
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278 void clear() _NOEXCEPT
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279 {
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280 __val_ = 0;
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281 __cat_ = &generic_category();
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282 }
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283
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284 _LIBCPP_INLINE_VISIBILITY
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285 int value() const _NOEXCEPT {return __val_;}
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286
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287 _LIBCPP_INLINE_VISIBILITY
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288 const error_category& category() const _NOEXCEPT {return *__cat_;}
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289 string message() const;
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290
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291 _LIBCPP_INLINE_VISIBILITY
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292 _LIBCPP_EXPLICIT
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293 operator bool() const _NOEXCEPT {return __val_ != 0;}
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294 };
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295
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296 inline _LIBCPP_INLINE_VISIBILITY
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297 error_condition
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298 make_error_condition(errc __e) _NOEXCEPT
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299 {
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300 return error_condition(static_cast<int>(__e), generic_category());
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301 }
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302
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303 inline _LIBCPP_INLINE_VISIBILITY
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304 bool
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305 operator<(const error_condition& __x, const error_condition& __y) _NOEXCEPT
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306 {
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307 return __x.category() < __y.category()
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308 || (__x.category() == __y.category() && __x.value() < __y.value());
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309 }
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310
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311 // error_code
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312
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313 class _LIBCPP_TYPE_VIS error_code
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314 {
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315 int __val_;
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316 const error_category* __cat_;
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317 public:
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318 _LIBCPP_INLINE_VISIBILITY
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319 error_code() _NOEXCEPT : __val_(0), __cat_(&system_category()) {}
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320
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321 _LIBCPP_INLINE_VISIBILITY
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322 error_code(int __val, const error_category& __cat) _NOEXCEPT
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323 : __val_(__val), __cat_(&__cat) {}
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324
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325 template <class _Ep>
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326 _LIBCPP_INLINE_VISIBILITY
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327 error_code(_Ep __e,
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328 typename enable_if<is_error_code_enum<_Ep>::value>::type* = 0
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329 ) _NOEXCEPT
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330 {*this = make_error_code(__e);}
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331
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332 _LIBCPP_INLINE_VISIBILITY
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333 void assign(int __val, const error_category& __cat) _NOEXCEPT
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334 {
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335 __val_ = __val;
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336 __cat_ = &__cat;
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337 }
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338
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339 template <class _Ep>
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340 _LIBCPP_INLINE_VISIBILITY
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341 typename enable_if
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342 <
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343 is_error_code_enum<_Ep>::value,
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344 error_code&
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345 >::type
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346 operator=(_Ep __e) _NOEXCEPT
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347 {*this = make_error_code(__e); return *this;}
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348
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349 _LIBCPP_INLINE_VISIBILITY
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350 void clear() _NOEXCEPT
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351 {
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352 __val_ = 0;
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353 __cat_ = &system_category();
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354 }
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355
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356 _LIBCPP_INLINE_VISIBILITY
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357 int value() const _NOEXCEPT {return __val_;}
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358
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359 _LIBCPP_INLINE_VISIBILITY
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360 const error_category& category() const _NOEXCEPT {return *__cat_;}
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361
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362 _LIBCPP_INLINE_VISIBILITY
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363 error_condition default_error_condition() const _NOEXCEPT
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364 {return __cat_->default_error_condition(__val_);}
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365
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366 string message() const;
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367
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368 _LIBCPP_INLINE_VISIBILITY
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369 _LIBCPP_EXPLICIT
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370 operator bool() const _NOEXCEPT {return __val_ != 0;}
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371 };
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372
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373 inline _LIBCPP_INLINE_VISIBILITY
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374 error_code
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375 make_error_code(errc __e) _NOEXCEPT
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376 {
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377 return error_code(static_cast<int>(__e), generic_category());
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378 }
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379
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380 inline _LIBCPP_INLINE_VISIBILITY
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381 bool
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382 operator<(const error_code& __x, const error_code& __y) _NOEXCEPT
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383 {
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384 return __x.category() < __y.category()
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385 || (__x.category() == __y.category() && __x.value() < __y.value());
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386 }
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387
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388 inline _LIBCPP_INLINE_VISIBILITY
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389 bool
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390 operator==(const error_code& __x, const error_code& __y) _NOEXCEPT
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391 {
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392 return __x.category() == __y.category() && __x.value() == __y.value();
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393 }
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394
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395 inline _LIBCPP_INLINE_VISIBILITY
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396 bool
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397 operator==(const error_code& __x, const error_condition& __y) _NOEXCEPT
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398 {
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399 return __x.category().equivalent(__x.value(), __y)
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400 || __y.category().equivalent(__x, __y.value());
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401 }
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402
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403 inline _LIBCPP_INLINE_VISIBILITY
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404 bool
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405 operator==(const error_condition& __x, const error_code& __y) _NOEXCEPT
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406 {
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407 return __y == __x;
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408 }
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409
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410 inline _LIBCPP_INLINE_VISIBILITY
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411 bool
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412 operator==(const error_condition& __x, const error_condition& __y) _NOEXCEPT
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413 {
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414 return __x.category() == __y.category() && __x.value() == __y.value();
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415 }
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416
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417 inline _LIBCPP_INLINE_VISIBILITY
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418 bool
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419 operator!=(const error_code& __x, const error_code& __y) _NOEXCEPT
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420 {return !(__x == __y);}
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421
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422 inline _LIBCPP_INLINE_VISIBILITY
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423 bool
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424 operator!=(const error_code& __x, const error_condition& __y) _NOEXCEPT
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425 {return !(__x == __y);}
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426
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427 inline _LIBCPP_INLINE_VISIBILITY
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428 bool
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429 operator!=(const error_condition& __x, const error_code& __y) _NOEXCEPT
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430 {return !(__x == __y);}
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431
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432 inline _LIBCPP_INLINE_VISIBILITY
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433 bool
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434 operator!=(const error_condition& __x, const error_condition& __y) _NOEXCEPT
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435 {return !(__x == __y);}
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436
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437 template <>
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438 struct _LIBCPP_TEMPLATE_VIS hash<error_code>
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439 : public unary_function<error_code, size_t>
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440 {
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441 _LIBCPP_INLINE_VISIBILITY
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442 size_t operator()(const error_code& __ec) const _NOEXCEPT
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443 {
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444 return static_cast<size_t>(__ec.value());
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445 }
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446 };
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447
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448 template <>
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449 struct _LIBCPP_TEMPLATE_VIS hash<error_condition>
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450 : public unary_function<error_condition, size_t>
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451 {
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452 _LIBCPP_INLINE_VISIBILITY
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453 size_t operator()(const error_condition& __ec) const _NOEXCEPT
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454 {
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455 return static_cast<size_t>(__ec.value());
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456 }
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457 };
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458
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459 // system_error
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460
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461 class _LIBCPP_TYPE_VIS system_error
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462 : public runtime_error
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463 {
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464 error_code __ec_;
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465 public:
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466 system_error(error_code __ec, const string& __what_arg);
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467 system_error(error_code __ec, const char* __what_arg);
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468 system_error(error_code __ec);
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469 system_error(int __ev, const error_category& __ecat, const string& __what_arg);
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470 system_error(int __ev, const error_category& __ecat, const char* __what_arg);
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471 system_error(int __ev, const error_category& __ecat);
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472 ~system_error() _NOEXCEPT;
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473
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474 _LIBCPP_INLINE_VISIBILITY
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475 const error_code& code() const _NOEXCEPT {return __ec_;}
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476
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477 private:
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478 static string __init(const error_code&, string);
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479 };
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480
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481 _LIBCPP_NORETURN _LIBCPP_FUNC_VIS
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482 void __throw_system_error(int ev, const char* what_arg);
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483
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484 _LIBCPP_END_NAMESPACE_STD
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485
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486 #endif // _LIBCPP_SYSTEM_ERROR
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