#define #else #if !defined Question

#define #else #if !defined Question - Printable Version

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+--- Thread: #define #else #if !defined Question (/showthread.php?tid=599439)

#define #else #if !defined Question - SkyFlare - 26.01.2016

Hey everyone, just a general query, wondering if this would work and if it wouldn't... what have I done wrong?

Code:

CMD:something(playerid, params[])
{
	#if defined SOMETHING
	#undef SOMETHING
	#endif
	#else
	#if !defined SOMETHING
	#define SOMETHING
	#endif
	return 1;
}

Re: #define #else #if !defined Question - [eLg]elite - 26.01.2016

These are called directives and they tell the computer what to do upon compile and not after that. You could use it if you didn't want a certain system to load while you are working on a new one, but I think most people would prefer to use /* */. They aren't useful for much other then checking if it is a gamemode or a filterscript. I learned this information from -Carrot and Vince. https://sampforum.blast.hk/showthread.php?tid=598432

Re: #define #else #if !defined Question - Crayder - 26.01.2016

pawn Code:

#if defined SOMETHING
        #undef SOMETHING
    #else
        #define SOMETHING
    #endif

In that command, no it will not work. But if something similar to this was used in includes and stuff it would.

It is all PRE PROCESSED. So it only works while compiling. Not while running.

Basically...

Re: #define #else #if !defined Question - SkyFlare - 26.01.2016

oh PRE PROCESSED, thanks Crayder, that's a shame, was trying to cut down some compile times haha

looks like i gotta hard code the if statements with variables etc