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/* ------------------------------------------------------------------------
* Exception.hh
*
* This file is part of 3Dwm: The Three-Dimensional User Environment.
*
* 3Dwm: The Three-Dimensional User Environment:
* <http://www.3dwm.org>
*
* Chalmers Medialab
* <http://www.medialab.chalmers.se>
*
* ------------------------------------------------------------------------
* File created 2000-11-24 by Niklas Elmqvist.
*
* Copyright (c) 2000 Niklas Elmqvist <elm@3dwm.org>.
* ------------------------------------------------------------------------
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
* ------------------------------------------------------------------------
*/
#ifndef _Exception_hh_
#define _Exception_hh_
// -- System Includes
#include <iostream>
#include <exception>
#include <string>
// -- Class Declarations
class Exception : public std::exception {
public:
/**
* Default constructor.
*
* @param msg the exception message.
**/
Exception(const char *msg = 0) : _msg(msg), _e(0) { }
/**
* Constructor.
*
* @param msg exception message.
**/
Exception(const std::string &msg) : _msg(msg), _e(0) { }
/**
* Constructor.
*
* @param e the exception.
**/
Exception(std::exception &e) : _e(&e) { }
/**
* Destructor.
**/
virtual ~Exception() throw() { }
/**
* Retrieve the exception cause (what caused the exception).
**/
virtual const char *what() const throw() {
return _msg.empty() == true ? _e->what() : _msg.c_str();
}
/**
* Retrieve the actual (standard) exception object.
**/
std::exception *getException() const {
return _e;
}
private:
std::string _msg;
std::exception *_e;
};
/**
* Exception output operator.
*
* @param os output stream.
* @param exception exception object.
* @return the (modified) output stream.
**/
inline std::ostream &operator << (std::ostream &os, const Exception &exception)
{
return os << (exception.what() == 0 ? "<exception>" : exception.what());
}
/**
* Exception output operator (for exception pointers).
*
* @param os output stream.
* @param exception exception object pointer.
* @return the (modified) output stream.
**/
inline std::ostream &operator << (std::ostream &os, Exception *exception)
{
return os << *exception;
}
#endif /* Exception.hh */
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