Need help with "#define" syntax ending with semicolon

This is a discussion on Need help with "#define" syntax ending with semicolon within the C++ Programming forums, part of the General Programming Boards category; Can someone explain me what's going on in the code below. As per my knowledge "#define <macro name> <Macro replacement>" ...

  1. #1
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    Need help with "#define" syntax ending with semicolon

    Can someone explain me what's going on in the code below. As per my knowledge "#define <macro name> <Macro replacement>" doesn't have a semicolon and it's terminated by a new line. But the code line in bold below has a semicolon and is followed by a function declaration. (This is a piece of working, complied code)

    Code:
     #define CST_CC_ERR LogMsg; s_ReportCSTFailure // Sets __FILE__ and __LINE__
    
    static void s_ReportCSTFailure( const string& msg, int rc, CST_LOG_ID logID, ccAuthViewR* out )                                                    
    {
            const char* func = out ? "ccAuthBus" : "s_ReportCSTFailure";
    
            /*
               LogMsg must be called prior to calling this function.
               See: CST_CC_ERR
            */
            CSTErrorMsg cstMsg( gVendHcst, func, msg, rc, logID );
    
            LogMsgInterface::getInstance() << cstMsg << endl;
    
            if (out)
            {
                    out->m_data.ccauthRespCd = cstMsg.info.number;
    
                    if (gVendHcst)
                    {
                            rc = CloseCST( gVendHcst );
                            if (CST_OK != rc)
                            {
                               CST_CC_ERR( string(), rc, CST_LOG_ID_CLOSE, 0 );
                            }
    
                            rc = DestroyCST( gVendHcst );
                            if (CST_OK != rc)
                            {
                               CST_CC_ERR( string(), rc, CST_LOG_ID_DESTROY, 0 );
                            }
                            gVendHcst = 0;
                    }
            }
    
    } // s_ReportCSTFailure() 
    Thanks.
    Last edited by slrj; 11-20-2006 at 12:30 PM.

  2. #2
    and the hat of wrongness Salem's Avatar
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    It doesn't mean anything, the two lines are completely independent.

    The real question is what the code looks like around places where CST_CC_ERR gets used.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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  3. #3
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    Code has been updated in post #1

    Salem,

    I have updated the code in post 1, to show the usage of CST_CC_ERR. Do you have anymore comments?

    Thanks.

  4. #4
    and the hat of wrongness Salem's Avatar
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    Well this
    CST_CC_ERR( string(), rc, CST_LOG_ID_CLOSE, 0 );

    Just expands to this
    LogMsg; s_ReportCSTFailure( string(), rc, CST_LOG_ID_CLOSE, 0 );

    Which seems to be a recursive call with the last parameter forced to NULL (presumably to stop it recursing forever).
    Though what LogMsg is supposed to achieve is anyones guess.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  5. #5
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    Thanks .. Salem

    Salem,

    Thanks for your explanation. I understand now.

    Thx.

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