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// Support for interoperability between Boost.System and <system_error>
//
// Copyright 2018 Peter Dimov
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// See library home page at http://www.boost.org/libs/system
#include <system_error>
#include <map>
#include <memory>
//
namespace boost
{
namespace system
{
namespace detail
{
class BOOST_SYMBOL_VISIBLE 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
{
return pc_->default_error_condition( ev );
}
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;
};
inline std::error_category const & to_std_category( boost::system::error_category const & cat )
{
typedef std::map< boost::system::error_category const *, std::unique_ptr<std_category> > map_type;
static map_type map_;
map_type::iterator i = map_.find( &cat );
if( i == map_.end() )
{
std::unique_ptr<std_category> p( new std_category( &cat ) );
std::pair<map_type::iterator, bool> r = map_.insert( map_type::value_type( &cat, std::move( p ) ) );
i = r.first;
}
return *i->second;
}
inline bool 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 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;
}
}
} // namespace detail
} // namespace system
} // namespace boost
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