diff options
Diffstat (limited to 'boost/system/error_code.hpp')
| -rw-r--r-- | boost/system/error_code.hpp | 293 |
1 files changed, 247 insertions, 46 deletions
diff --git a/boost/system/error_code.hpp b/boost/system/error_code.hpp index b6ff6e4bad..0d64b2b72e 100644 --- a/boost/system/error_code.hpp +++ b/boost/system/error_code.hpp @@ -1,4 +1,4 @@ -// boost/system/error_code.hpp ---------------------------------------------// +// boost/system/error_code.hpp -------------------------------------------------------// // Copyright Beman Dawes 2006, 2007 // Copyright Christoper Kohlhoff 2007 @@ -28,6 +28,10 @@ # error BOOST_POSIX_API or BOOST_WINDOWS_API must be defined #endif +#ifndef BOOST_NO_CXX11_HDR_SYSTEM_ERROR +#include <system_error> +#endif + #include <boost/config/abi_prefix.hpp> // must be the last #include #ifndef BOOST_SYSTEM_NOEXCEPT @@ -43,7 +47,7 @@ namespace boost class error_condition; // portable generic values defined below, but ultimately // based on the POSIX standard - // "Concept" helpers ---------------------------------------------------// + // "Concept" helpers -------------------------------------------------------------// template< class T > struct is_error_code_enum { static const bool value = false; }; @@ -51,7 +55,7 @@ namespace boost template< class T > struct is_error_condition_enum { static const bool value = false; }; - // generic error_conditions --------------------------------------------// + // generic error_conditions ------------------------------------------------------// namespace errc { @@ -149,9 +153,9 @@ namespace boost { static const bool value = true; }; - // ----------------------------------------------------------------------// + // --------------------------------------------------------------------------------// - // Operating system specific interfaces --------------------------------// + // Operating system specific interfaces ------------------------------------------// // The interface is divided into general and system-specific portions to @@ -179,52 +183,152 @@ namespace boost // These headers are effectively empty for compiles on operating systems // where they are not applicable. - // ----------------------------------------------------------------------// + // --------------------------------------------------------------------------------// + + class error_category; + + // predefined error categories ---------------------------------------------------// + +#ifdef BOOST_ERROR_CODE_HEADER_ONLY + inline const error_category & system_category() BOOST_SYSTEM_NOEXCEPT; + inline const error_category & generic_category() BOOST_SYSTEM_NOEXCEPT; +#else + BOOST_SYSTEM_DECL const error_category & system_category() BOOST_SYSTEM_NOEXCEPT; + BOOST_SYSTEM_DECL const error_category & generic_category() BOOST_SYSTEM_NOEXCEPT; +#endif + // deprecated synonyms ------------------------------------------------------------// + +#ifndef BOOST_SYSTEM_NO_DEPRECATED + inline const error_category & get_system_category() { return system_category(); } + inline const error_category & get_generic_category() { return generic_category(); } + inline const error_category & get_posix_category() { return generic_category(); } + static const error_category & posix_category BOOST_ATTRIBUTE_UNUSED + = generic_category(); + static const error_category & errno_ecat BOOST_ATTRIBUTE_UNUSED + = generic_category(); + static const error_category & native_ecat BOOST_ATTRIBUTE_UNUSED + = system_category(); +#endif // class error_category ------------------------------------------------// class error_category : public noncopyable { +#ifndef BOOST_NO_CXX11_HDR_SYSTEM_ERROR + + private: + + class std_category: public std::error_category + { + private: + + boost::system::error_category const * pc_; + + public: + + explicit std_category( boost::system::error_category const * pc ): pc_( pc ) + { + } + + virtual const char * name() const BOOST_NOEXCEPT + { + return pc_->name(); + } + + virtual std::string message( int ev ) const + { + return pc_->message( ev ); + } + + virtual std::error_condition default_error_condition( int ev ) const + BOOST_NOEXCEPT; + virtual bool equivalent( int code, const std::error_condition & condition ) const + BOOST_NOEXCEPT; + virtual bool equivalent( const std::error_code & code, int condition ) const + BOOST_NOEXCEPT; + }; + + std_category std_cat_; + + public: + + error_category() BOOST_SYSTEM_NOEXCEPT: std_cat_( this ) {} + + operator std::error_category const & () const BOOST_SYSTEM_NOEXCEPT + { + // do not map generic to std::generic on purpose; occasionally, + // there are two std::generic categories in a program, which leads + // to error codes/conditions mysteriously not being equal to themselves + return std_cat_; + } + +#else + + // to maintain ABI compatibility between 03 and 11, + // define a class with the same layout + + private: + + class std_category + { + private: + + boost::system::error_category const * pc_; + + public: + + explicit std_category( boost::system::error_category const * pc ): pc_( pc ) + { + } + + virtual ~std_category() {} + + virtual const char * name() const BOOST_NOEXCEPT + { + return pc_->name(); + } + + // we can't define message, because (1) it returns an std::string, + // which can be different between 03 and 11, and (2) on mingw, there + // are actually two `message` functions, not one, so it doesn't work + // even if we do + + // neither can we define default_error_condition or equivalent + + // if these functions are called, it will crash, but that's still + // better than the alternative of having the class layout change + }; + + std_category std_cat_; + + public: + + error_category() BOOST_SYSTEM_NOEXCEPT: std_cat_( this ) {} + +#endif + public: virtual ~error_category(){} virtual const char * name() const BOOST_SYSTEM_NOEXCEPT = 0; virtual std::string message( int ev ) const = 0; - inline virtual error_condition default_error_condition( int ev ) const BOOST_SYSTEM_NOEXCEPT; + inline virtual error_condition default_error_condition( int ev ) const + BOOST_SYSTEM_NOEXCEPT; inline virtual bool equivalent( int code, - const error_condition & condition ) const BOOST_SYSTEM_NOEXCEPT; + const error_condition & condition ) const + BOOST_SYSTEM_NOEXCEPT; inline virtual bool equivalent( const error_code & code, int condition ) const BOOST_SYSTEM_NOEXCEPT; - bool operator==(const error_category & rhs) const BOOST_SYSTEM_NOEXCEPT { return this == &rhs; } - bool operator!=(const error_category & rhs) const BOOST_SYSTEM_NOEXCEPT { return this != &rhs; } + bool operator==(const error_category & rhs) const BOOST_SYSTEM_NOEXCEPT + { return this == &rhs; } + bool operator!=(const error_category & rhs) const BOOST_SYSTEM_NOEXCEPT + { return this != &rhs; } bool operator<( const error_category & rhs ) const BOOST_SYSTEM_NOEXCEPT - { - return std::less<const error_category*>()( this, &rhs ); - } + { return std::less<const error_category*>()( this, &rhs ); } }; - // predefined error categories -----------------------------------------// - -# ifdef BOOST_ERROR_CODE_HEADER_ONLY - inline const error_category & system_category() BOOST_SYSTEM_NOEXCEPT; - inline const error_category & generic_category() BOOST_SYSTEM_NOEXCEPT; -#else - BOOST_SYSTEM_DECL const error_category & system_category() BOOST_SYSTEM_NOEXCEPT; - BOOST_SYSTEM_DECL const error_category & generic_category() BOOST_SYSTEM_NOEXCEPT; -#endif - // deprecated synonyms --------------------------------------------------// - -# ifndef BOOST_SYSTEM_NO_DEPRECATED - inline const error_category & get_system_category() { return system_category(); } - inline const error_category & get_generic_category() { return generic_category(); } - inline const error_category & get_posix_category() { return generic_category(); } - static const error_category & posix_category BOOST_ATTRIBUTE_UNUSED = generic_category(); - static const error_category & errno_ecat BOOST_ATTRIBUTE_UNUSED = generic_category(); - static const error_category & native_ecat BOOST_ATTRIBUTE_UNUSED = system_category(); -# endif - - // class error_condition -----------------------------------------------// + // class error_condition ---------------------------------------------------------// // error_conditions are portable, error_codes are system or library specific @@ -234,11 +338,13 @@ namespace boost // constructors: error_condition() BOOST_SYSTEM_NOEXCEPT : m_val(0), m_cat(&generic_category()) {} - error_condition( int val, const error_category & cat ) BOOST_SYSTEM_NOEXCEPT : m_val(val), m_cat(&cat) {} + error_condition( int val, const error_category & cat ) BOOST_SYSTEM_NOEXCEPT + : m_val(val), m_cat(&cat) {} template <class ErrorConditionEnum> error_condition(ErrorConditionEnum e, - typename boost::enable_if<is_error_condition_enum<ErrorConditionEnum> >::type* = 0) BOOST_SYSTEM_NOEXCEPT + typename boost::enable_if<is_error_condition_enum<ErrorConditionEnum> >::type* + = 0) BOOST_SYSTEM_NOEXCEPT { *this = make_error_condition(e); } @@ -252,7 +358,8 @@ namespace boost } template<typename ErrorConditionEnum> - typename boost::enable_if<is_error_condition_enum<ErrorConditionEnum>, error_condition>::type & + typename boost::enable_if<is_error_condition_enum<ErrorConditionEnum>, + error_condition>::type & operator=( ErrorConditionEnum val ) BOOST_SYSTEM_NOEXCEPT { *this = make_error_condition(val); @@ -301,13 +408,22 @@ namespace boost || (lhs.m_cat == rhs.m_cat && lhs.m_val < rhs.m_val); } +#ifndef BOOST_NO_CXX11_HDR_SYSTEM_ERROR + + operator std::error_condition () const BOOST_SYSTEM_NOEXCEPT + { + return std::error_condition( value(), category() ); + } + +#endif + private: int m_val; const error_category * m_cat; }; - // class error_code ----------------------------------------------------// + // class error_code --------------------------------------------------------------// // We want error_code to be a value type that can be copied without slicing // and without requiring heap allocation, but we also want it to have @@ -321,11 +437,13 @@ namespace boost // constructors: error_code() BOOST_SYSTEM_NOEXCEPT : m_val(0), m_cat(&system_category()) {} - error_code( int val, const error_category & cat ) BOOST_SYSTEM_NOEXCEPT : m_val(val), m_cat(&cat) {} + error_code( int val, const error_category & cat ) BOOST_SYSTEM_NOEXCEPT + : m_val(val), m_cat(&cat) {} template <class ErrorCodeEnum> error_code(ErrorCodeEnum e, - typename boost::enable_if<is_error_code_enum<ErrorCodeEnum> >::type* = 0) BOOST_SYSTEM_NOEXCEPT + typename boost::enable_if<is_error_code_enum<ErrorCodeEnum> >::type* = 0) + BOOST_SYSTEM_NOEXCEPT { *this = make_error_code(e); } @@ -354,7 +472,8 @@ namespace boost // observers: int value() const BOOST_SYSTEM_NOEXCEPT { return m_val; } const error_category & category() const BOOST_SYSTEM_NOEXCEPT { return *m_cat; } - error_condition default_error_condition() const BOOST_SYSTEM_NOEXCEPT { return m_cat->default_error_condition(value()); } + error_condition default_error_condition() const BOOST_SYSTEM_NOEXCEPT + { return m_cat->default_error_condition(value()); } std::string message() const { return m_cat->message(value()); } typedef void (*unspecified_bool_type)(); @@ -388,6 +507,15 @@ namespace boost || (lhs.m_cat == rhs.m_cat && lhs.m_val < rhs.m_val); } +#ifndef BOOST_NO_CXX11_HDR_SYSTEM_ERROR + + operator std::error_code () const BOOST_SYSTEM_NOEXCEPT + { + return std::error_code( value(), category() ); + } + +#endif + private: int m_val; const error_category * m_cat; @@ -475,7 +603,7 @@ namespace boost + reinterpret_cast<std::size_t>(&ec.category()); } - // make_* functions for errc::errc_t -----------------------------// + // make_* functions for errc::errc_t ---------------------------------------------// namespace errc { @@ -488,9 +616,10 @@ namespace boost { return error_condition( e, generic_category() ); } } - // error_category default implementation -------------------------------// + // error_category default implementation -----------------------------------------// - error_condition error_category::default_error_condition( int ev ) const BOOST_SYSTEM_NOEXCEPT + error_condition error_category::default_error_condition( int ev ) const + BOOST_SYSTEM_NOEXCEPT { return error_condition( ev, *this ); } @@ -507,6 +636,80 @@ namespace boost return *this == code.category() && code.value() == condition; } +#ifndef BOOST_NO_CXX11_HDR_SYSTEM_ERROR + + inline std::error_condition error_category::std_category::default_error_condition( + int ev ) const BOOST_NOEXCEPT + { + return pc_->default_error_condition( ev ); + } + + inline bool error_category::std_category::equivalent( int code, + const std::error_condition & condition ) const BOOST_NOEXCEPT + { + if( condition.category() == *this ) + { + boost::system::error_condition bn( condition.value(), *pc_ ); + return pc_->equivalent( code, bn ); + } + else if( condition.category() == std::generic_category() + || condition.category() == boost::system::generic_category() ) + { + boost::system::error_condition bn( condition.value(), + boost::system::generic_category() ); + + return pc_->equivalent( code, bn ); + } +#ifndef BOOST_NO_RTTI + else if( std_category const* pc2 = dynamic_cast< std_category const* >( + &condition.category() ) ) + { + boost::system::error_condition bn( condition.value(), *pc2->pc_ ); + return pc_->equivalent( code, bn ); + } +#endif + else + { + return default_error_condition( code ) == condition; + } + } + + inline bool error_category::std_category::equivalent( const std::error_code & code, + int condition ) const BOOST_NOEXCEPT + { + if( code.category() == *this ) + { + boost::system::error_code bc( code.value(), *pc_ ); + return pc_->equivalent( bc, condition ); + } + else if( code.category() == std::generic_category() + || code.category() == boost::system::generic_category() ) + { + boost::system::error_code bc( code.value(), + boost::system::generic_category() ); + + return pc_->equivalent( bc, condition ); + } +#ifndef BOOST_NO_RTTI + else if( std_category const* pc2 = dynamic_cast< std_category const* >( + &code.category() ) ) + { + boost::system::error_code bc( code.value(), *pc2->pc_ ); + return pc_->equivalent( bc, condition ); + } +#endif + else if( *pc_ == boost::system::generic_category() ) + { + return std::generic_category().equivalent( code, condition ); + } + else + { + return false; + } + } + +#endif + } // namespace system } // namespace boost @@ -517,5 +720,3 @@ namespace boost # endif #endif // BOOST_SYSTEM_ERROR_CODE_HPP - - |