Sandman: New page: category:precompiler == Definition == '''#ifdef''' : ['''#else :] '''#endif''' Checks if ''what to check'' was previously defined in the code. I...

Sandman — Sun, 30 Dec 2007 13:53:47 GMT

New page: category:precompiler == Definition == '''#ifdef''' <what to check> :<if block> ['''#else :<else block>] '''#endif''' Checks if ''what to check'' was previously defined in the code. I...

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[[category:precompiler]]

== Definition ==
'''#ifdef''' <what to check>
:<if block>
['''#else
:<else block>]
'''#endif'''

Checks if ''what to check'' was previously defined in the code. If it is, the code in ''if block'' will be compiled. If it isn't, the code in ''else block'' will be compiled or when there is no ''else block'', the compiler will continue after [[precompiler_endif|#endif]].

== Example ==
Here we will be able to choose whether to support a certain function with the precompiler:
<pre>
#ifdef SOMEFUNCTIONALITY
Function int SomeFunction()
Begin
return 0;
End
#endif
</pre>
Used in example: [[Function]], [[Begin]], [[End]], [[precompiler_endif|#endif]]

Consider a define to set the framepercentage in a certain process. Now for some reason you might want to just have a frame; compiled when that define is set to ''100''.
<pre>
Loop
#ifdef FRAMEPERC
#if FRAMEPERC == 100
frame;
#else
frame(FRAMEPERC);
#endif
#else
frame;
#endif
End
</pre>
Used in example: [[Loop]], [[End]], [[frame]], [[precompiler_if|#if]], [[precompiler_else|#else]], [[precompiler_endif|#endif]]

{{Precompiler_statements}}

Precompiler ifdef - Revision history

Sandman: New page: category:precompiler == Definition == '''#ifdef''' : ['''#else :] '''#endif''' Checks if ''what to check'' was previously defined in the code. I...