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copied!<p>I thought it might be interesting to post some real code for a change. This is the exception class my own utility library uses:</p> <pre><code>//--------------------------------------------------------------------------- // a_except.h // // alib exception handling stuff // // Copyright (C) 2008 Neil Butterworth //--------------------------------------------------------------------------- #ifndef INC_A_EXCEPT_H #define INC_A_EXCEPT_H #include "a_base.h" #include <exception> #include <sstream> namespace ALib { //------------------------------------------------------------------------ // The only exception thrown directly by alib //------------------------------------------------------------------------ class Exception : public std::exception { public: Exception( const std::string & msg = "" ); Exception( const std::string & msg, int line, const std::string & file ); ~Exception() throw(); const char *what() const throw(); const std::string & Msg() const; int Line() const; const std::string & File() const; private: std::string mMsg, mFile; int mLine; }; //------------------------------------------------------------------------ // Macro to throw an alib exception with message formatting. // Remember macro is not in ALib namespace! //------------------------------------------------------------------------ #define ATHROW( msg ) \ { \ std::ostringstream os; \ os << msg; \ throw ALib::Exception( os.str(), __LINE__, __FILE__ ); \ } \ } // namespace #endif </code></pre> <p>And this is the .cpp file:</p> <pre><code>//--------------------------------------------------------------------------- // a_except.h // // alib exception handling stuff // // Copyright (C) 2008 Neil Butterworth //--------------------------------------------------------------------------- #include "a_except.h" using std::string; namespace ALib { //--------------------------------------------------------------------------- // exception with optional message, filename & line number //------------------------------------------------------------------------ Exception :: Exception( const string & msg ) : mMsg( msg ), mFile( "" ), mLine(0) { } Exception :: Exception( const string & msg, int line, const string & file ) : mMsg( msg ), mFile( file ), mLine( line ) { } //--------------------------------------------------------------------------- // Do nothing //--------------------------------------------------------------------------- Exception :: ~Exception() throw() { } //------------------------------------------------------------------------ // message as C string via standard what() function //------------------------------------------------------------------------ const char * Exception :: what() const throw() { return mMsg.c_str(); } //------------------------------------------------------------------------ // as above, but as C++ string //------------------------------------------------------------------------ const string & Exception :: Msg() const { return mMsg; } //--------------------------------------------------------------------------- // File name & line number //--------------------------------------------------------------------------- int Exception :: Line() const { return mLine; } const string & Exception :: File() const { return mFile; } } // namespace // end </code></pre>

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