1 #ifndef BOOST_SYSTEM_ERROR_CODE_HPP_INCLUDED
2 #define BOOST_SYSTEM_ERROR_CODE_HPP_INCLUDED
4 // Copyright Beman Dawes 2006, 2007
5 // Copyright Christoper Kohlhoff 2007
6 // Copyright Peter Dimov 2017, 2018
8 // Distributed under the Boost Software License, Version 1.0. (See accompanying
9 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
11 // See library home page at http://www.boost.org/libs/system
13 #include <boost/system/api_config.hpp>
14 #include <boost/system/detail/config.hpp>
15 #include <boost/cstdint.hpp>
16 #include <boost/config.hpp>
22 // TODO: undef these macros if not already defined
23 #include <boost/cerrno.hpp>
25 #if defined(BOOST_SYSTEM_HAS_SYSTEM_ERROR)
26 # include <system_error>
29 #if !defined(BOOST_POSIX_API) && !defined(BOOST_WINDOWS_API)
30 # error BOOST_POSIX_API or BOOST_WINDOWS_API must be defined
39 class error_code; // values defined by the operating system
40 class error_condition; // portable generic values defined below, but ultimately
41 // based on the POSIX standard
45 template<class T> struct is_error_code_enum
47 static const bool value = false;
50 template<class T> struct is_error_condition_enum
52 static const bool value = false;
55 // Generic error_conditions
63 address_family_not_supported = EAFNOSUPPORT,
64 address_in_use = EADDRINUSE,
65 address_not_available = EADDRNOTAVAIL,
66 already_connected = EISCONN,
67 argument_list_too_long = E2BIG,
68 argument_out_of_domain = EDOM,
70 bad_file_descriptor = EBADF,
71 bad_message = EBADMSG,
73 connection_aborted = ECONNABORTED,
74 connection_already_in_progress = EALREADY,
75 connection_refused = ECONNREFUSED,
76 connection_reset = ECONNRESET,
77 cross_device_link = EXDEV,
78 destination_address_required = EDESTADDRREQ,
79 device_or_resource_busy = EBUSY,
80 directory_not_empty = ENOTEMPTY,
81 executable_format_error = ENOEXEC,
83 file_too_large = EFBIG,
84 filename_too_long = ENAMETOOLONG,
85 function_not_supported = ENOSYS,
86 host_unreachable = EHOSTUNREACH,
87 identifier_removed = EIDRM,
88 illegal_byte_sequence = EILSEQ,
89 inappropriate_io_control_operation = ENOTTY,
91 invalid_argument = EINVAL,
92 invalid_seek = ESPIPE,
94 is_a_directory = EISDIR,
95 message_size = EMSGSIZE,
96 network_down = ENETDOWN,
97 network_reset = ENETRESET,
98 network_unreachable = ENETUNREACH,
99 no_buffer_space = ENOBUFS,
100 no_child_process = ECHILD,
102 no_lock_available = ENOLCK,
103 no_message_available = ENODATA,
105 no_protocol_option = ENOPROTOOPT,
106 no_space_on_device = ENOSPC,
107 no_stream_resources = ENOSR,
108 no_such_device_or_address = ENXIO,
109 no_such_device = ENODEV,
110 no_such_file_or_directory = ENOENT,
111 no_such_process = ESRCH,
112 not_a_directory = ENOTDIR,
113 not_a_socket = ENOTSOCK,
114 not_a_stream = ENOSTR,
115 not_connected = ENOTCONN,
116 not_enough_memory = ENOMEM,
117 not_supported = ENOTSUP,
118 operation_canceled = ECANCELED,
119 operation_in_progress = EINPROGRESS,
120 operation_not_permitted = EPERM,
121 operation_not_supported = EOPNOTSUPP,
122 operation_would_block = EWOULDBLOCK,
123 owner_dead = EOWNERDEAD,
124 permission_denied = EACCES,
125 protocol_error = EPROTO,
126 protocol_not_supported = EPROTONOSUPPORT,
127 read_only_file_system = EROFS,
128 resource_deadlock_would_occur = EDEADLK,
129 resource_unavailable_try_again = EAGAIN,
130 result_out_of_range = ERANGE,
131 state_not_recoverable = ENOTRECOVERABLE,
132 stream_timeout = ETIME,
133 text_file_busy = ETXTBSY,
134 timed_out = ETIMEDOUT,
135 too_many_files_open_in_system = ENFILE,
136 too_many_files_open = EMFILE,
137 too_many_links = EMLINK,
138 too_many_symbolic_link_levels = ELOOP,
139 value_too_large = EOVERFLOW,
140 wrong_protocol_type = EPROTOTYPE
145 #ifdef BOOST_SYSTEM_ENABLE_DEPRECATED
147 namespace posix = errc;
148 namespace posix_error = errc;
152 template<> struct is_error_condition_enum<errc::errc_t>
154 static const bool value = true;
157 // class error_category
158 #if ( defined( BOOST_GCC ) && BOOST_GCC >= 40600 ) || defined( BOOST_CLANG )
159 #pragma GCC diagnostic push
160 #pragma GCC diagnostic ignored "-Wnon-virtual-dtor"
164 #pragma warning( push )
165 // 'this' : used in base member initializer list
166 #pragma warning( disable: 4355 )
169 std::size_t hash_value( error_code const & ec );
171 class BOOST_SYMBOL_VISIBLE error_category
175 friend std::size_t hash_value( error_code const & ec );
177 #if !defined(BOOST_NO_CXX11_DELETED_FUNCTIONS)
180 error_category( error_category const & ) = delete;
181 error_category& operator=( error_category const & ) = delete;
186 error_category( error_category const & );
187 error_category& operator=( error_category const & );
193 boost::ulong_long_type id_;
197 #if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) && !defined(BOOST_NO_CXX11_NON_PUBLIC_DEFAULTED_FUNCTIONS)
199 ~error_category() = default;
203 // We'd like to make the destructor protected, to make code that deletes
204 // an error_category* not compile; unfortunately, doing the below makes
205 // the destructor user-provided and hence breaks use after main, as the
206 // categories may get destroyed before code that uses them
208 // ~error_category() {}
212 BOOST_SYSTEM_CONSTEXPR error_category() BOOST_NOEXCEPT: id_( 0 )
216 explicit BOOST_SYSTEM_CONSTEXPR error_category( boost::ulong_long_type id ) BOOST_NOEXCEPT: id_( id )
222 virtual const char * name() const BOOST_NOEXCEPT = 0;
224 virtual error_condition default_error_condition( int ev ) const BOOST_NOEXCEPT;
225 virtual bool equivalent( int code, const error_condition & condition ) const BOOST_NOEXCEPT;
226 virtual bool equivalent( const error_code & code, int condition ) const BOOST_NOEXCEPT;
228 virtual std::string message( int ev ) const = 0;
229 virtual char const * message( int ev, char * buffer, std::size_t len ) const BOOST_NOEXCEPT;
231 virtual bool failed( int ev ) const BOOST_NOEXCEPT;
233 BOOST_SYSTEM_CONSTEXPR bool operator==( const error_category & rhs ) const BOOST_NOEXCEPT
235 return rhs.id_ == 0? this == &rhs: id_ == rhs.id_;
238 BOOST_SYSTEM_CONSTEXPR bool operator!=( const error_category & rhs ) const BOOST_NOEXCEPT
240 return !( *this == rhs );
243 BOOST_SYSTEM_CONSTEXPR bool operator<( const error_category & rhs ) const BOOST_NOEXCEPT
257 return false; // equal
260 return std::less<error_category const *>()( this, &rhs );
263 #if defined(BOOST_SYSTEM_HAS_SYSTEM_ERROR)
265 operator std::error_category const & () const;
271 #pragma warning( pop )
274 // predefined error categories
279 class BOOST_SYMBOL_VISIBLE generic_error_category: public error_category
283 // clang++ 3.8 and below: initialization of const object
284 // requires a user-provided default constructor
285 BOOST_SYSTEM_CONSTEXPR generic_error_category() BOOST_NOEXCEPT:
286 error_category( ( boost::ulong_long_type( 0xB2AB117A ) << 32 ) + 0x257EDF0D )
290 const char * name() const BOOST_NOEXCEPT
295 std::string message( int ev ) const;
296 char const * message( int ev, char * buffer, std::size_t len ) const BOOST_NOEXCEPT;
299 class BOOST_SYMBOL_VISIBLE system_error_category: public error_category
303 BOOST_SYSTEM_CONSTEXPR system_error_category() BOOST_NOEXCEPT:
304 error_category( ( boost::ulong_long_type( 0x8FAFD21E ) << 32 ) + 0x25C5E09B )
308 const char * name() const BOOST_NOEXCEPT
313 error_condition default_error_condition( int ev ) const BOOST_NOEXCEPT;
315 std::string message( int ev ) const;
316 char const * message( int ev, char * buffer, std::size_t len ) const BOOST_NOEXCEPT;
319 } // namespace detail
321 #if ( defined( BOOST_GCC ) && BOOST_GCC >= 40600 ) || defined( BOOST_CLANG )
322 #pragma GCC diagnostic pop
325 // generic_category(), system_category()
327 #if defined(BOOST_SYSTEM_HAS_CONSTEXPR)
332 template<class T> struct BOOST_SYMBOL_VISIBLE cat_holder
334 static constexpr system_error_category system_category_instance{};
335 static constexpr generic_error_category generic_category_instance{};
338 // Before C++17 it was mandatory to redeclare all static constexpr
339 #if defined(BOOST_NO_CXX17_INLINE_VARIABLES)
340 template<class T> constexpr system_error_category cat_holder<T>::system_category_instance;
341 template<class T> constexpr generic_error_category cat_holder<T>::generic_category_instance;
344 } // namespace detail
346 constexpr error_category const & system_category() BOOST_NOEXCEPT
348 return detail::cat_holder<void>::system_category_instance;
351 constexpr error_category const & generic_category() BOOST_NOEXCEPT
353 return detail::cat_holder<void>::generic_category_instance;
356 #else // #if defined(BOOST_SYSTEM_HAS_CONSTEXPR)
358 inline error_category const & system_category() BOOST_NOEXCEPT BOOST_SYMBOL_VISIBLE;
360 inline error_category const & system_category() BOOST_NOEXCEPT
362 static const detail::system_error_category system_category_instance;
363 return system_category_instance;
366 inline error_category const & generic_category() BOOST_NOEXCEPT BOOST_SYMBOL_VISIBLE;
368 inline error_category const & generic_category() BOOST_NOEXCEPT
370 static const detail::generic_error_category generic_category_instance;
371 return generic_category_instance;
374 #endif // #if defined(BOOST_SYSTEM_HAS_CONSTEXPR)
376 // deprecated synonyms
378 #ifdef BOOST_SYSTEM_ENABLE_DEPRECATED
380 inline const error_category & get_system_category() { return system_category(); }
381 inline const error_category & get_generic_category() { return generic_category(); }
382 inline const error_category & get_posix_category() { return generic_category(); }
383 static const error_category & posix_category BOOST_ATTRIBUTE_UNUSED = generic_category();
384 static const error_category & errno_ecat BOOST_ATTRIBUTE_UNUSED = generic_category();
385 static const error_category & native_ecat BOOST_ATTRIBUTE_UNUSED = system_category();
394 template<bool C, class T = void> struct enable_if
399 template<class T> struct enable_if<false, T>
405 #if !defined(BOOST_SYSTEM_HAS_CONSTEXPR)
407 inline bool failed_impl( int ev, error_category const & cat )
409 return cat.failed( ev );
414 BOOST_SYSTEM_CONSTEXPR inline bool failed_impl( int ev, error_category const & cat )
416 if( cat == system_category() || cat == generic_category() )
422 return cat.failed( ev );
428 } // namespace detail
430 // class error_condition
432 // error_conditions are portable, error_codes are system or library specific
434 class error_condition
440 error_category const * cat_;
446 BOOST_SYSTEM_CONSTEXPR error_condition() BOOST_NOEXCEPT:
447 val_( 0 ), failed_( false ), cat_( &generic_category() )
451 BOOST_SYSTEM_CONSTEXPR error_condition( int val, const error_category & cat ) BOOST_NOEXCEPT:
452 val_( val ), failed_( detail::failed_impl( val, cat ) ), cat_( &cat )
456 template<class ErrorConditionEnum> BOOST_SYSTEM_CONSTEXPR error_condition( ErrorConditionEnum e,
457 typename detail::enable_if<is_error_condition_enum<ErrorConditionEnum>::value>::type* = 0) BOOST_NOEXCEPT
459 *this = make_error_condition( e );
464 BOOST_SYSTEM_CONSTEXPR void assign( int val, const error_category & cat ) BOOST_NOEXCEPT
467 failed_ = detail::failed_impl( val, cat );
471 template<typename ErrorConditionEnum>
472 BOOST_SYSTEM_CONSTEXPR typename detail::enable_if<is_error_condition_enum<ErrorConditionEnum>::value, error_condition>::type &
473 operator=( ErrorConditionEnum val ) BOOST_NOEXCEPT
475 *this = make_error_condition( val );
479 BOOST_SYSTEM_CONSTEXPR void clear() BOOST_NOEXCEPT
483 cat_ = &generic_category();
488 BOOST_SYSTEM_CONSTEXPR int value() const BOOST_NOEXCEPT
493 BOOST_SYSTEM_CONSTEXPR const error_category & category() const BOOST_NOEXCEPT
498 std::string message() const
500 return cat_->message( value() );
503 char const * message( char * buffer, std::size_t len ) const BOOST_NOEXCEPT
505 return cat_->message( value(), buffer, len );
508 BOOST_SYSTEM_CONSTEXPR bool failed() const BOOST_NOEXCEPT
513 #if !defined(BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS)
515 BOOST_SYSTEM_CONSTEXPR explicit operator bool() const BOOST_NOEXCEPT // true if error
522 typedef void (*unspecified_bool_type)();
523 static void unspecified_bool_true() {}
525 BOOST_SYSTEM_CONSTEXPR operator unspecified_bool_type() const BOOST_NOEXCEPT // true if error
527 return val_ != 0? unspecified_bool_true: 0;
530 BOOST_SYSTEM_CONSTEXPR bool operator!() const BOOST_NOEXCEPT // true if no error
538 // the more symmetrical non-member syntax allows enum
539 // conversions work for both rhs and lhs.
541 BOOST_SYSTEM_CONSTEXPR inline friend bool operator==( const error_condition & lhs, const error_condition & rhs ) BOOST_NOEXCEPT
543 return lhs.val_ == rhs.val_ && *lhs.cat_ == *rhs.cat_;
546 BOOST_SYSTEM_CONSTEXPR inline friend bool operator<( const error_condition & lhs, const error_condition & rhs ) BOOST_NOEXCEPT
548 return *lhs.cat_ < *rhs.cat_ || ( *lhs.cat_ == *rhs.cat_ && lhs.val_ < rhs.val_ );
551 #if defined(BOOST_SYSTEM_HAS_SYSTEM_ERROR)
553 operator std::error_condition () const
555 return std::error_condition( value(), category() );
563 // We want error_code to be a value type that can be copied without slicing
564 // and without requiring heap allocation, but we also want it to have
565 // polymorphic behavior based on the error category. This is achieved by
566 // abstract base class error_category supplying the polymorphic behavior,
567 // and error_code containing a pointer to an object of a type derived
568 // from error_category.
576 const error_category * cat_;
582 BOOST_SYSTEM_CONSTEXPR error_code() BOOST_NOEXCEPT:
583 val_( 0 ), failed_( false ), cat_( &system_category() )
587 BOOST_SYSTEM_CONSTEXPR error_code( int val, const error_category & cat ) BOOST_NOEXCEPT:
588 val_( val ), failed_( detail::failed_impl( val, cat ) ), cat_( &cat )
592 template<class ErrorCodeEnum> BOOST_SYSTEM_CONSTEXPR error_code( ErrorCodeEnum e,
593 typename detail::enable_if<is_error_code_enum<ErrorCodeEnum>::value>::type* = 0 ) BOOST_NOEXCEPT
595 *this = make_error_code( e );
600 BOOST_SYSTEM_CONSTEXPR void assign( int val, const error_category & cat ) BOOST_NOEXCEPT
603 failed_ = detail::failed_impl( val, cat );
607 template<typename ErrorCodeEnum>
608 BOOST_SYSTEM_CONSTEXPR typename detail::enable_if<is_error_code_enum<ErrorCodeEnum>::value, error_code>::type &
609 operator=( ErrorCodeEnum val ) BOOST_NOEXCEPT
611 *this = make_error_code( val );
615 BOOST_SYSTEM_CONSTEXPR void clear() BOOST_NOEXCEPT
619 cat_ = &system_category();
624 BOOST_SYSTEM_CONSTEXPR int value() const BOOST_NOEXCEPT
629 BOOST_SYSTEM_CONSTEXPR const error_category & category() const BOOST_NOEXCEPT
634 error_condition default_error_condition() const BOOST_NOEXCEPT
636 return cat_->default_error_condition( value() );
639 std::string message() const
641 return cat_->message( value() );
644 char const * message( char * buffer, std::size_t len ) const BOOST_NOEXCEPT
646 return cat_->message( value(), buffer, len );
649 BOOST_SYSTEM_CONSTEXPR bool failed() const BOOST_NOEXCEPT
654 #if !defined(BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS)
656 BOOST_SYSTEM_CONSTEXPR explicit operator bool() const BOOST_NOEXCEPT // true if error
663 typedef void (*unspecified_bool_type)();
664 static void unspecified_bool_true() {}
666 BOOST_SYSTEM_CONSTEXPR operator unspecified_bool_type() const BOOST_NOEXCEPT // true if error
668 return val_ != 0? unspecified_bool_true: 0;
671 BOOST_SYSTEM_CONSTEXPR bool operator!() const BOOST_NOEXCEPT // true if no error
680 // the more symmetrical non-member syntax allows enum
681 // conversions work for both rhs and lhs.
683 BOOST_SYSTEM_CONSTEXPR inline friend bool operator==( const error_code & lhs, const error_code & rhs ) BOOST_NOEXCEPT
685 return lhs.val_ == rhs.val_ && *lhs.cat_ == *rhs.cat_;
688 BOOST_SYSTEM_CONSTEXPR inline friend bool operator<( const error_code & lhs, const error_code & rhs ) BOOST_NOEXCEPT
690 return *lhs.cat_ < *rhs.cat_ || ( *lhs.cat_ == *rhs.cat_ && lhs.val_ < rhs.val_ );
693 #if defined(BOOST_SYSTEM_HAS_SYSTEM_ERROR)
695 operator std::error_code () const
697 return std::error_code( value(), category() );
703 } // namespace system
710 // Misuse of the error_code object is turned into a noisy failure by
711 // poisoning the reference. This particular implementation doesn't
712 // produce warnings or errors from popular compilers, is very efficient
713 // (as determined by inspecting generated code), and does not suffer
714 // from order of initialization problems. In practice, it also seems
715 // cause user function error handling implementation errors to be detected
716 // very early in the development cycle.
718 inline system::error_code* throws()
720 // See github.com/boostorg/system/pull/12 by visigoth for why the return
721 // is poisoned with nonzero rather than (0). A test, test_throws_usage(),
722 // has been added to error_code_test.cpp, and as visigoth mentioned it
723 // fails on clang for release builds with a return of 0 but works fine
725 // Since the undefined behavior sanitizer (-fsanitize=undefined) does not
726 // allow a reference to be formed to the unaligned address of (1), we use
729 return reinterpret_cast<system::error_code*>(8);
732 } // namespace detail
734 inline system::error_code& throws()
736 return *detail::throws();
739 // non-member functions of error_code and error_condition
744 BOOST_SYSTEM_CONSTEXPR inline bool operator!=( const error_code & lhs, const error_code & rhs ) BOOST_NOEXCEPT
746 return !( lhs == rhs );
749 BOOST_SYSTEM_CONSTEXPR inline bool operator!=( const error_condition & lhs, const error_condition & rhs ) BOOST_NOEXCEPT
751 return !( lhs == rhs );
754 inline bool operator==( const error_code & code, const error_condition & condition ) BOOST_NOEXCEPT
756 return code.category().equivalent( code.value(), condition ) || condition.category().equivalent( code, condition.value() );
759 inline bool operator!=( const error_code & lhs, const error_condition & rhs ) BOOST_NOEXCEPT
761 return !( lhs == rhs );
764 inline bool operator==( const error_condition & condition, const error_code & code ) BOOST_NOEXCEPT
766 return code.category().equivalent( code.value(), condition ) || condition.category().equivalent( code, condition.value() );
769 inline bool operator!=( const error_condition & lhs, const error_code & rhs ) BOOST_NOEXCEPT
771 return !( lhs == rhs );
774 template <class charT, class traits>
775 inline std::basic_ostream<charT,traits>&
776 operator<< (std::basic_ostream<charT,traits>& os, error_code ec)
778 os << ec.category().name() << ':' << ec.value();
782 inline std::size_t hash_value( error_code const & ec )
784 error_category const & cat = ec.category();
786 boost::ulong_long_type id = cat.id_;
790 id = reinterpret_cast<boost::uintptr_t>( &cat );
793 boost::ulong_long_type hv = ( boost::ulong_long_type( 0xCBF29CE4 ) << 32 ) + 0x84222325;
794 boost::ulong_long_type const prime = ( boost::ulong_long_type( 0x00000100 ) << 32 ) + 0x000001B3;
803 hv ^= static_cast<unsigned>( ec.value() );
806 return static_cast<std::size_t>( hv );
809 // make_* functions for errc::errc_t
814 // explicit conversion:
815 BOOST_SYSTEM_CONSTEXPR inline error_code make_error_code( errc_t e ) BOOST_NOEXCEPT
817 return error_code( e, generic_category() );
820 // implicit conversion:
821 BOOST_SYSTEM_CONSTEXPR inline error_condition make_error_condition( errc_t e ) BOOST_NOEXCEPT
823 return error_condition( e, generic_category() );
828 // error_category default implementation
830 inline error_condition error_category::default_error_condition( int ev ) const BOOST_NOEXCEPT
832 return error_condition( ev, *this );
835 inline bool error_category::equivalent( int code, const error_condition & condition ) const BOOST_NOEXCEPT
837 return default_error_condition( code ) == condition;
840 inline bool error_category::equivalent( const error_code & code, int condition ) const BOOST_NOEXCEPT
842 return *this == code.category() && code.value() == condition;
845 inline char const * error_category::message( int ev, char * buffer, std::size_t len ) const BOOST_NOEXCEPT
858 #if !defined(BOOST_NO_EXCEPTIONS)
862 std::string m = this->message( ev );
864 # if defined( BOOST_MSVC )
865 # pragma warning( push )
866 # pragma warning( disable: 4996 )
867 # elif defined(__clang__) && defined(__has_warning)
868 # pragma clang diagnostic push
869 # if __has_warning("-Wdeprecated-declarations")
870 # pragma clang diagnostic ignored "-Wdeprecated-declarations"
874 std::strncpy( buffer, m.c_str(), len - 1 );
877 # if defined( BOOST_MSVC )
878 # pragma warning( pop )
879 # elif defined(__clang__) && defined(__has_warning)
880 # pragma clang diagnostic pop
885 #if !defined(BOOST_NO_EXCEPTIONS)
888 return "Message text unavailable";
893 inline bool error_category::failed( int ev ) const BOOST_NOEXCEPT
898 } // namespace system
902 // generic_error_category implementation
904 #include <boost/system/detail/generic_category.hpp>
906 inline std::string boost::system::detail::generic_error_category::message( int ev ) const
908 return generic_error_category_message( ev );
911 inline char const * boost::system::detail::generic_error_category::message( int ev, char * buffer, std::size_t len ) const BOOST_NOEXCEPT
913 return generic_error_category_message( ev, buffer, len );
916 // system_error_category implementation
918 #if defined(BOOST_WINDOWS_API)
920 #include <boost/system/detail/system_category_win32.hpp>
922 inline boost::system::error_condition boost::system::detail::system_error_category::default_error_condition( int ev ) const BOOST_NOEXCEPT
924 return system_category_default_error_condition_win32( ev );
927 inline std::string boost::system::detail::system_error_category::message( int ev ) const
929 return system_category_message_win32( ev );
932 inline char const * boost::system::detail::system_error_category::message( int ev, char * buffer, std::size_t len ) const BOOST_NOEXCEPT
934 return system_category_message_win32( ev, buffer, len );
937 #else // #if defined(BOOST_WINDOWS_API)
939 #include <boost/system/detail/system_category_posix.hpp>
941 inline boost::system::error_condition boost::system::detail::system_error_category::default_error_condition( int ev ) const BOOST_NOEXCEPT
943 return system_category_default_error_condition_posix( ev );
946 inline std::string boost::system::detail::system_error_category::message( int ev ) const
948 return generic_error_category_message( ev );
951 inline char const * boost::system::detail::system_error_category::message( int ev, char * buffer, std::size_t len ) const BOOST_NOEXCEPT
953 return generic_error_category_message( ev, buffer, len );
956 #endif // #if defined(BOOST_WINDOWS_API)
958 // interoperability with std::error_code, std::error_condition
960 #if defined(BOOST_SYSTEM_HAS_SYSTEM_ERROR)
962 #include <boost/system/detail/std_interoperability.hpp>
964 inline boost::system::error_category::operator std::error_category const & () const
966 return boost::system::detail::to_std_category( *this );
969 #endif // #if defined(BOOST_SYSTEM_HAS_SYSTEM_ERROR)
971 #endif // BOOST_SYSTEM_ERROR_CODE_HPP_INCLUDED