1 // <system_error> -*- C++ -*-
3 // Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
25 /** @file system_error
26 * This is a Standard C++ Library header.
29 #ifndef _GLIBCXX_SYSTEM_ERROR
30 #define _GLIBCXX_SYSTEM_ERROR 1
32 #pragma GCC system_header
34 #ifndef __GXX_EXPERIMENTAL_CXX0X__
35 # include <c++0x_warning.h>
38 #include <bits/c++config.h>
39 #include <bits/error_constants.h>
43 _GLIBCXX_BEGIN_NAMESPACE(std)
46 class error_condition;
50 /// is_error_code_enum
51 template<typename _Tp>
52 struct is_error_code_enum : public false_type { };
54 /// is_error_condition_enum
55 template<typename _Tp>
56 struct is_error_condition_enum : public false_type { };
59 struct is_error_condition_enum<errc>
60 : public true_type { };
67 error_category() = default;
70 virtual ~error_category() { }
72 error_category(const error_category&) = delete;
73 error_category& operator=(const error_category&) = delete;
79 message(int) const = 0;
81 virtual error_condition
82 default_error_condition(int __i) const;
85 equivalent(int __i, const error_condition& __cond) const;
88 equivalent(const error_code& __code, int __i) const;
91 operator<(const error_category& __other) const
92 { return less<const error_category*>()(this, &__other); }
95 operator==(const error_category& __other) const
96 { return this == &__other; }
99 operator!=(const error_category& __other) const
100 { return this != &__other; }
104 _GLIBCXX_CONST const error_category& system_category() throw ();
105 _GLIBCXX_CONST const error_category& generic_category() throw ();
107 error_code make_error_code(errc);
110 // Implementation-specific error identification
114 : _M_value(0), _M_cat(&system_category()) { }
116 error_code(int __v, const error_category& __cat)
117 : _M_value(__v), _M_cat(&__cat) { }
119 template<typename _ErrorCodeEnum>
120 error_code(_ErrorCodeEnum __e,
121 typename enable_if<is_error_code_enum<_ErrorCodeEnum>::value>::type* = 0)
122 { *this = make_error_code(__e); }
125 assign(int __v, const error_category& __cat)
133 { assign(0, system_category()); }
136 template<typename _ErrorCodeEnum>
137 typename enable_if<is_error_code_enum<_ErrorCodeEnum>::value,
139 operator=(_ErrorCodeEnum __e)
140 { return *this = make_error_code(__e); }
143 value() const { return _M_value; }
145 const error_category&
146 category() const { return *_M_cat; }
149 default_error_condition() const;
153 { return category().message(value()); }
155 explicit operator bool() const
156 { return _M_value != 0 ? true : false; }
161 const error_category* _M_cat;
164 // 19.4.2.6 non-member functions
166 make_error_code(errc __e)
167 { return error_code(static_cast<int>(__e), generic_category()); }
170 operator<(const error_code& __lhs, const error_code& __rhs)
172 return (__lhs.category() < __rhs.category()
173 || (__lhs.category() == __rhs.category()
174 && __lhs.value() < __rhs.value()));
177 template<typename _CharT, typename _Traits>
178 basic_ostream<_CharT, _Traits>&
179 operator<<(basic_ostream<_CharT, _Traits>& __os, const error_code& __e)
180 { return (__os << __e.category().name() << ':' << __e.value()); }
182 error_condition make_error_condition(errc);
185 // Portable error identification
186 struct error_condition
189 : _M_value(0), _M_cat(&generic_category()) { }
191 error_condition(int __v, const error_category& __cat)
192 : _M_value(__v), _M_cat(&__cat) { }
194 template<typename _ErrorConditionEnum>
195 error_condition(_ErrorConditionEnum __e,
196 typename enable_if<is_error_condition_enum
197 <_ErrorConditionEnum>::value>::type* = 0)
198 { *this = make_error_condition(__e); }
201 assign(int __v, const error_category& __cat)
208 template<typename _ErrorConditionEnum>
209 typename enable_if<is_error_condition_enum
210 <_ErrorConditionEnum>::value, error_condition&>::type
211 operator=(_ErrorConditionEnum __e)
212 { return *this = make_error_condition(__e); }
216 { assign(0, generic_category()); }
218 // 19.4.3.4 observers
220 value() const { return _M_value; }
222 const error_category&
223 category() const { return *_M_cat; }
227 { return category().message(value()); }
229 explicit operator bool() const
230 { return _M_value != 0 ? true : false; }
235 const error_category* _M_cat;
238 // 19.4.3.6 non-member functions
239 inline error_condition
240 make_error_condition(errc __e)
241 { return error_condition(static_cast<int>(__e), generic_category()); }
244 operator<(const error_condition& __lhs, const error_condition& __rhs)
246 return (__lhs.category() < __rhs.category()
247 || (__lhs.category() == __rhs.category()
248 && __lhs.value() < __rhs.value()));
251 // 19.4.4 Comparison operators
253 operator==(const error_code& __lhs, const error_code& __rhs)
254 { return (__lhs.category() == __rhs.category()
255 && __lhs.value() == __rhs.value()); }
258 operator==(const error_code& __lhs, const error_condition& __rhs)
260 return (__lhs.category().equivalent(__lhs.value(), __rhs)
261 || __rhs.category().equivalent(__lhs, __rhs.value()));
265 operator==(const error_condition& __lhs, const error_code& __rhs)
267 return (__rhs.category().equivalent(__rhs.value(), __lhs)
268 || __lhs.category().equivalent(__rhs, __lhs.value()));
272 operator==(const error_condition& __lhs, const error_condition& __rhs)
274 return (__lhs.category() == __rhs.category()
275 && __lhs.value() == __rhs.value());
279 operator!=(const error_code& __lhs, const error_code& __rhs)
280 { return !(__lhs == __rhs); }
283 operator!=(const error_code& __lhs, const error_condition& __rhs)
284 { return !(__lhs == __rhs); }
287 operator!=(const error_condition& __lhs, const error_code& __rhs)
288 { return !(__lhs == __rhs); }
291 operator!=(const error_condition& __lhs, const error_condition& __rhs)
292 { return !(__lhs == __rhs); }
296 * @brief Thrown to indicate error code of underlying system.
298 * @ingroup exceptions
300 class system_error : public std::runtime_error
306 system_error(error_code __ec = error_code())
307 : runtime_error(""), _M_code(__ec) { }
309 system_error(error_code __ec, const string& __what)
310 : runtime_error(__what), _M_code(__ec) { }
313 * TODO: Add const char* ctors to all exceptions.
315 * system_error(error_code __ec, const char* __what)
316 * : runtime_error(__what), _M_code(__ec) { }
318 * system_error(int __v, const error_category& __ecat, const char* __what)
319 * : runtime_error(__what), _M_code(error_code(__v, __ecat)) { }
322 system_error(int __v, const error_category& __ecat)
323 : runtime_error(""), _M_code(error_code(__v, __ecat)) { }
325 system_error(int __v, const error_category& __ecat, const string& __what)
326 : runtime_error(__what), _M_code(error_code(__v, __ecat)) { }
328 virtual ~system_error() throw();
331 code() const throw() { return _M_code; }
334 _GLIBCXX_END_NAMESPACE
336 #endif // __GXX_EXPERIMENTAL_CXX0X__
338 #endif // _GLIBCXX_SYSTEM_ERROR