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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 BOOST_SYMBOL_VISIBLE system_error : public std::runtime_error // BOOST_SYMBOL_VISIBLE is needed by GCC to ensure system_error thrown from a shared // library can be caught. See svn.boost.org/trac/boost/ticket/3697 { 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() ) { #ifndef BOOST_NO_EXCEPTIONS try #endif { m_what = this->std::runtime_error::what(); if ( !m_what.empty() ) m_what += ": "; m_what += m_error_code.message(); } #ifndef BOOST_NO_EXCEPTIONS catch (...) { return std::runtime_error::what(); } #endif } return m_what.c_str(); } } // namespace system } // namespace boost #endif // BOOST_SYSTEM_ERROR_HPP