imgtools/imglib/boostlibrary/boost/system/system_error.hpp
author jjkang
Fri, 25 Jun 2010 18:11:34 +0800
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//  Boost system_error.hpp  --------------------------------------------------//
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//  Copyright Beman Dawes 2006
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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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#ifndef BOOST_SYSTEM_ERROR_HPP
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#define BOOST_SYSTEM_ERROR_HPP
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#include <string>
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#include <stdexcept>
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#include <cassert>
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#include <boost/system/error_code.hpp>
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namespace boost
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{
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  namespace system
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  {
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    //  class system_error  --------------------------------------------------//
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    class system_error : public std::runtime_error
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    {
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    public:
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      system_error( error_code ec )
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          : std::runtime_error(""), m_error_code(ec) {}
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      system_error( error_code ec, const std::string & what_arg )
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          : std::runtime_error(what_arg), m_error_code(ec) {}
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      system_error( error_code ec, const char* what_arg )
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          : std::runtime_error(what_arg), m_error_code(ec) {}
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      system_error( int ev, const error_category & ecat )
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          : std::runtime_error(""), m_error_code(ev,ecat) {}
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      system_error( int ev, const error_category & ecat,
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        const std::string & what_arg )
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          : std::runtime_error(what_arg), m_error_code(ev,ecat) {}
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      system_error( int ev, const error_category & ecat,
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        const char * what_arg )
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          : std::runtime_error(what_arg), m_error_code(ev,ecat) {}
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      virtual ~system_error() throw() {}
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      const error_code &  code() const throw() { return m_error_code; }
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      const char *        what() const throw();
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    private:
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      error_code           m_error_code;
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      mutable std::string  m_what;
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    };
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    //  implementation  ------------------------------------------------------//
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    inline const char * system_error::what() const throw()
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    // see http://www.boost.org/more/error_handling.html for lazy build rationale
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    {
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      if ( m_what.empty() )
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      {
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        try
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        {
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          m_what = this->std::runtime_error::what();
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          if ( m_error_code )
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          {
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            if ( !m_what.empty() ) m_what += ": ";
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            m_what += m_error_code.message();
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          }
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        }
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        catch (...) { return std::runtime_error::what(); }
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      }
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      return m_what.c_str();
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    }
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  } // namespace system
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} // namespace boost
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#endif // BOOST_SYSTEM_ERROR_HPP
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