what does "SUPER " mean?

Posted on 2001-07-09
Last Modified: 2008-03-06
in the following:

#define SUPER TTActor

what does "SUPER " mean?


Question by:she25
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LVL 22

Accepted Solution

nietod earned 30 total points
ID: 6267479
It means "TTActor"

Anythign else?  :-)

what you are looking at is a C Pre-processor statement (any statement that begins with "#" at the start of the line.)  In this case it is a pre-processor #define statement.  This statement is used to create pre-procssor definitions and macros.

In this case it creates a pre-processor defintion.  The definition is for the word "SUPER"  which it defines as "TTActor"  The pre-processor will look through the code and will look for any occurance of "SUPPER" in the code (not in comments or strings) an will replace it with "TTActor".



Expert Comment

ID: 6267484
It doesn't "mean" anything. The line creates an "alias" for TTActor named SUPER.

For example

#define BUFFSIZE 256
char   sz_buffer[BUFFSIZE+1];


LVL 22

Expert Comment

ID: 6267491
So for example, if your code was like

#define SUPER TTActor

class TTActor

SUPER AnActor;

the pre-processor would convert the code to

#define SUPER TTActor

class TTActor

TTActor AnActor;

Note that this sort of use of the pre-processor is now strongly discouraged.  It was often necessary to use the pre-processor in C, but it also caused lots of problems.  So C+++ provides better alternatives for almost all the features of the pre-processor.   There are still two areas where the pre-processor stil needs to be used, it needs to be used for #include directives and for conditional compilation directives. Like the #ifdef include guards used in many include files.  (These conditional compilations situations often require that #define be used, but the vlaues defined are only used by the pre-processor, they do not direcly affect the code.)
LVL 22

Expert Comment

ID: 6267498

>> #define BUFFSIZE 256
>> char   sz_buffer[BUFFSIZE+1];

is one of the things that the pre-processor should not be used for. (In C++, it was necesary in C.).  For example the code

const int BUFFSIZE = 256;
char   sz_buffer[BUFFSIZE+1];

is far better.

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