/* -*- C++ -*-

  * src/lemon/error.h - Part of LEMON, a generic C++ optimization library

  *

  * Copyright (C) 2004 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

  * (Egervary Combinatorial Optimization Research Group, EGRES).

  *

  * Permission to use, modify and distribute this software is granted

  * provided that this copyright notice appears in all copies. For

  * precise terms see the accompanying LICENSE file.

  *

  * This software is provided "AS IS" with no warranty of any kind,

  * express or implied, and with no claim as to its suitability for any

  * purpose.

  *

  */

 #ifndef LEMON_ERROR_H

 #define LEMON_ERROR_H

 //! \ingroup misc

 //! \file

 //! \brief Basic error handling (signaling) routines.

 #include <exception>

 #include <string>

 #include <sstream>

 namespace lemon {

   /**

    * \brief Generic exception class.

    *

    * \todo Do we need this?

    *

    * \todo Don't we need different kind of exceptions for different kind

    * of errors?

    * Shouldn't we use \<stdexcept\> instead?

    */

   class Exception : public std::exception {

   protected:

     std::ostringstream buf;

   public:

     Exception() {}

     explicit Exception(const std::string &s) { buf << s; }

     Exception(const Exception &e) : std::exception() {

       buf << e.buf.str();

     }

     virtual ~Exception() throw() {}

     virtual const char* what() const throw() {

       return buf.str().c_str();

     }

     template <typename T>

     Exception& operator<<(T const& t) { buf << t; return *this; }

   };

   /**

    * \brief Generic error signaling function.

    *

    * \todo Do we really need this? Is it helpful?

    */

   inline void fault(const std::string &msg) {

     throw Exception(msg);

   }

   /**

    * \brief Macro for mark not yet implemented features.

    *

    * \todo Is this the right place for this? It should be used only in

    * modules under development.

    */

 # define FIXME(msg) \

     do { throw ::lemon::Exception() << "FIXME: " msg " (in: "    \

       __FILE__ ", " << __LINE__ << ")";                          \

     } while(false)

 }

 #endif // LEMON_ERROR_H