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// Boost system_error.hpp --------------------------------------------------//
// Copyright Beman Dawes 2006
// 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)
#ifndef BOOST_SYSTEM_ERROR_HPP
#define BOOST_SYSTEM_ERROR_HPP
#include <string>
#include <stdexcept>
#include <cassert>
#include <boost/system/error_code.hpp>
namespace boost
{
namespace system
{
// class system_error --------------------------------------------------//
class system_error : public std::runtime_error
{
public:
system_error( error_code ec )
: std::runtime_error(""), m_error_code(ec) {}
system_error( error_code ec, const std::string & what_arg )
: std::runtime_error(what_arg), m_error_code(ec) {}
system_error( error_code ec, const char* what_arg )
: std::runtime_error(what_arg), m_error_code(ec) {}
system_error( int ev, const error_category & ecat )
: std::runtime_error(""), m_error_code(ev,ecat) {}
system_error( int ev, const error_category & ecat,
const std::string & what_arg )
: std::runtime_error(what_arg), m_error_code(ev,ecat) {}
system_error( int ev, const error_category & ecat,
const char * what_arg )
: std::runtime_error(what_arg), m_error_code(ev,ecat) {}
virtual ~system_error() throw() {}
const error_code & code() const throw() { return m_error_code; }
const char * what() const throw();
private:
error_code m_error_code;
mutable std::string m_what;
};
// implementation ------------------------------------------------------//
inline const char * system_error::what() const throw()
// see http://www.boost.org/more/error_handling.html for lazy build rationale
{
if ( m_what.empty() )
{
try
{
m_what = this->std::runtime_error::what();
if ( m_error_code )
{
if ( !m_what.empty() ) m_what += ": ";
m_what += m_error_code.message();
}
}
catch (...) { return std::runtime_error::what(); }
}
return m_what.c_str();
}
} // namespace system
} // namespace boost
#endif // BOOST_SYSTEM_ERROR_HPP
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