/*

    File:       Error Macros.h

    Contains:   These macros can be used to implement nice error handling within a function.

                Essentially, all errors jump to an error handler at the end of the function, 

                which should cleanup  any leftovers and return the appropriate error result.

                Note that the error handlers take a message string.  This should be a good

                indication of the actual error, and it will appear when debugging is turned

                on.

                Note that any additional sanity checking code can be added to any function 

                by using

                    #if qDebugging

                        // do additional sanity checking here.

                    #endif

                For example, this could be used to check the internal validity of an object

                before taking an action.

    Written by: Timothy Carroll 

    Copyright:  Copyright © 1996-1999 by Apple Computer, Inc., All Rights Reserved.

                You may incorporate this Apple sample source code into your program(s) without

                restriction. This Apple sample source code has been provided "AS IS" and the

                responsibility for its operation is yours. You are not permitted to redistribute

                this Apple sample source code as "Apple sample source code" after having made

                changes. If you're going to re-distribute the source, we require that you make

                it clear in the source that the code was descended from Apple sample source

                code, but that you've made changes.

    Change History (most recent first):

                7/2/1999    Karl Groethe    Updated for Metrowerks Codewarror Pro 2.1

*/

// App may want to override qDebugging

#include "AppConditionals.h"

#pragma once

#ifndef qDebugging

    #define qDebugging 0

#endif

#if qDebugging

    #define SIGNAL_ERROR(msg)       {DebugStr(msg); goto error;}

#else

    #define SIGNAL_ERROR(msg)       {goto error;}

#endif

#define FAIL_NIL(y,msg)         if (y == NULL) SIGNAL_ERROR(msg)

#define FAIL_OSERR(y,msg)       if (y != noErr) SIGNAL_ERROR(msg)

#define FAIL_FALSE(y,msg)       if (!y) SIGNAL_ERROR(msg)