89 lines
2.6 KiB
C++
89 lines
2.6 KiB
C++
//
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// Copyright (C) 2001-2003 Graeme Walker <graeme_walker@users.sourceforge.net>
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later
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// version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// ===
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//
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// gexception.h
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//
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#ifndef G_EXCEPTION_H
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#define G_EXCEPTION_H
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#include "gdef.h"
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#include <string>
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#include <iostream>
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namespace G
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{
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class Exception ;
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}
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// Class: G::Exception
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// Description: A general-purpose exception class derived from std::exception
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// and containing a std::string.
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//
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class G::Exception : public std::exception
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{
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protected:
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std::string m_what ;
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public:
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Exception() ;
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// Default constructor.
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explicit Exception( const char * what ) ;
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// Constructor.
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explicit Exception( const std::string & what ) ;
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// Constructor.
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virtual ~Exception() throw() ;
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// Destructor.
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virtual const char * what() const throw() ;
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// Override from std::exception.
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void prepend( const char * context ) ;
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// Prepends context to the what string.
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// Inserts a separator as needed.
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void append( const char * more ) ;
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// Appends 'more' to the what string.
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// Inserts a separator as needed.
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void append( const std::string & more ) ;
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// Appends 'more' to the what string.
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// Inserts a separator as needed.
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void append( std::ostream & s ) ;
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// Appends the contents of the given std::stringstream
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// (sic) to the what string. Does nothing if the
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// dynamic type of 's' is not a std::stringstream.
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// Inserts a separator as needed.
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//
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// This method allows a derived-class exception
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// to be constructed and thrown on one
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// line using iostream formatting.
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// Eg. throw Error( std::ostringstream() << a << b ) ;
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} ;
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#define G_EXCEPTION( class_name , description ) class class_name : public G::Exception { public: class_name() { m_what = description ; } public: explicit class_name ( std::ostream & stream ) { m_what = description ; append(stream) ; } public: explicit class_name( const char * more ) { m_what = description ; append(more) ; } public: explicit class_name( const std::string & more ) { m_what = description ; append(more) ; } }
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#endif
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