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MCThrow.h

00001 #if !defined(__MCTHROW_H_)
00002 #define __MCTHROW_H_
00003 
00004 #ident "@(#)$Id: MCThrow.h,v 1.5 2004/12/02 07:05:20 mike Exp $"
00005 
00006 /*
00007  * Copyright Miba Consulting Ltd. (c) 2000-2003
00008  * 
00009  * This library is free software; you can redistribute it and/or
00010  * modify it under the terms of the GNU Lesser General Public
00011  * License as published by the Free Software Foundation; either
00012  * version 2.1 of the License, or (at your option) any later version.
00013  * 
00014  * This library is distributed in the hope that it will be useful,
00015  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00016  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
00017  * Lesser General Public License for more details.
00018  * 
00019  * You should have received a copy of the GNU Lesser General Public
00020  * License along with this library; if not, write to the Free Software
00021  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
00022  *
00023  */
00024 
00025 #include "mcllib/MCExcept.h"
00026 #include "mcllib/MCStringStream.h"
00027 
00028 namespace mcllib
00029 {
00039     template<typename MCEXT> class MCThrowWrapper : public MCEXT
00040     {
00041     public:
00042         MCThrowWrapper(const MCEXT& ex) : MCEXT(ex) { }
00043         MCThrowWrapper(const MCEXT& ex, const char* file, int line)
00044             : MCEXT(ex)
00045         {
00046             setFileLine(file, line);
00047         }
00048         inline MCEXT& operator+=(const MCStringStream& mcss)
00049         {
00050             complete(mcss);
00051             return(*this);
00052         }
00053     };
00054 
00060     template<typename MCEXT>
00061     MCThrowWrapper<MCEXT>
00062     MCExceptMaker(const MCEXT& ex, const char* file, int line) 
00063     {
00064         if (ex.getMsg().hasSrc()) {
00065             // Ignore the new file/line information (preserve the existing)
00066             return(MCThrowWrapper<MCEXT>(ex));
00067         } else {
00068             // Doesn't have file/line information, so incorporate it
00069             return(MCThrowWrapper<MCEXT>(ex, file, line));
00070         }
00071     }
00073     MCThrowWrapper<mcllib::MCExcept>
00074     MCExceptMaker(const char* msg, const char* file, int line); 
00075 };
00076 
00083 #define MCThrow(ex) MCThrowFileLine((ex), __FILE__, __LINE__)
00084 
00090 #define MCThrowFileLine(ex, file, line) \
00091     throw mcllib::MCExceptMaker((ex), (file), (line)) \
00092         += mcllib::MCStringStream()
00093 
00094 #endif

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