/* -*- 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();

    }

    Exception& operator<<(std::string const& s) { buf << s; return *this; }

    Exception& operator<<(char const *s) { buf << s; return *this; }

    Exception& operator<<(int i) { buf << i; 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