Exception.h

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/*
 * $Id: ConfigException.h 64 2008-01-14 20:31:24Z phbaer $
 *
 * Copyright 2008 Carpe Noctem, Distributed Systems Group,
 * University of Kassel. All right reserved.
 *
 * The code is licensed under the Carpe Noctem Userfriendly BSD-Based
 * License (CNUBBL). Redistribution and use in source and binary forms,
 * with or without modification, are permitted provided that the
 * conditions of the CNUBBL are met.
 *
 * You should have received a copy of the CNUBBL along with this
 * software. The license is also available on our website:
 * http://carpenoctem.das-lab.net/license.txt
 */

#ifndef CASTOR_EXCEPTION_H
#define CASTOR_EXCEPTION_H 1

#ifndef _GNU_SOURCE
#  define _GNU_SOURCE
#endif
#include <stdio.h>

#include <stdlib.h>
#include <exception>
#include <string>
#include <iostream>
#include <cstdarg>

namespace castor {

        class Exception : public std::exception {

                protected:

                        std::string reason;

                public:

                        Exception(const std::string what = "unknown exception occured", ...) throw() :
                                std::exception(), reason()
                        {
                                va_list params;
                                va_start(params, what);
                                setReason(what, params);
                                va_end(params);
                        }

                        virtual ~Exception() throw() {
                        }
                        
                        virtual const char *what() const throw() {
                                return this->reason.c_str();
                        }
                        
                protected:

                        void setReason(const std::string &what, va_list &args) {

                                char *result = NULL;

                                if (vasprintf(&result, what.c_str(), args) == -1) {
                                        std::cout << "Exception: Error while setting reason!" << std::endl;
                                }

                                this->reason = std::string(result);

                                free(result);
                        }
        };
}

std::ostream &operator << (std::ostream &os, const castor::Exception &x);

#endif /* CASTOR_EXCEPTION_H */