142 lines
3.6 KiB
C++
142 lines
3.6 KiB
C++
// Support for interoperability between Boost.System and <system_error>
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//
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// Copyright 2018 Peter Dimov
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See library home page at http://www.boost.org/libs/system
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#include <system_error>
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#include <map>
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#include <memory>
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//
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namespace boost
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{
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namespace system
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{
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namespace detail
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{
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class BOOST_SYMBOL_VISIBLE std_category: public std::error_category
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{
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private:
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boost::system::error_category const * pc_;
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public:
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explicit std_category( boost::system::error_category const * pc ): pc_( pc )
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{
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}
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virtual const char * name() const BOOST_NOEXCEPT
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{
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return pc_->name();
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}
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virtual std::string message( int ev ) const
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{
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return pc_->message( ev );
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}
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virtual std::error_condition default_error_condition( int ev ) const BOOST_NOEXCEPT
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{
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return pc_->default_error_condition( ev );
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}
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virtual bool equivalent( int code, const std::error_condition & condition ) const BOOST_NOEXCEPT;
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virtual bool equivalent( const std::error_code & code, int condition ) const BOOST_NOEXCEPT;
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};
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inline std::error_category const & to_std_category( boost::system::error_category const & cat )
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{
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typedef std::map< boost::system::error_category const *, std::unique_ptr<std_category> > map_type;
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static map_type map_;
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map_type::iterator i = map_.find( &cat );
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if( i == map_.end() )
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{
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std::unique_ptr<std_category> p( new std_category( &cat ) );
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std::pair<map_type::iterator, bool> r = map_.insert( map_type::value_type( &cat, std::move( p ) ) );
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i = r.first;
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}
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return *i->second;
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}
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inline bool std_category::equivalent( int code, const std::error_condition & condition ) const BOOST_NOEXCEPT
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{
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if( condition.category() == *this )
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{
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boost::system::error_condition bn( condition.value(), *pc_ );
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return pc_->equivalent( code, bn );
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}
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else if( condition.category() == std::generic_category() || condition.category() == boost::system::generic_category() )
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{
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boost::system::error_condition bn( condition.value(), boost::system::generic_category() );
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return pc_->equivalent( code, bn );
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}
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#ifndef BOOST_NO_RTTI
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else if( std_category const* pc2 = dynamic_cast< std_category const* >( &condition.category() ) )
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{
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boost::system::error_condition bn( condition.value(), *pc2->pc_ );
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return pc_->equivalent( code, bn );
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}
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#endif
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else
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{
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return default_error_condition( code ) == condition;
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}
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}
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inline bool std_category::equivalent( const std::error_code & code, int condition ) const BOOST_NOEXCEPT
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{
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if( code.category() == *this )
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{
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boost::system::error_code bc( code.value(), *pc_ );
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return pc_->equivalent( bc, condition );
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}
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else if( code.category() == std::generic_category() || code.category() == boost::system::generic_category() )
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{
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boost::system::error_code bc( code.value(), boost::system::generic_category() );
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return pc_->equivalent( bc, condition );
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}
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#ifndef BOOST_NO_RTTI
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else if( std_category const* pc2 = dynamic_cast< std_category const* >( &code.category() ) )
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{
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boost::system::error_code bc( code.value(), *pc2->pc_ );
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return pc_->equivalent( bc, condition );
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}
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#endif
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else if( *pc_ == boost::system::generic_category() )
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{
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return std::generic_category().equivalent( code, condition );
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}
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else
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{
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return false;
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}
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}
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} // namespace detail
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} // namespace system
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} // namespace boost
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