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C++ Define help needed

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jeremy6996
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Joined: 20 May 2007
Posts: 100

Posted: Sun Jul 08, 2007 6:32 pm Post subject: C++ Define help needed

I get the whole code and I know what it does but I don't get this.

Code:

#define aa
#ifdef aa
//Do somthing
#else
//Do somthing
#endif

The thing I don't get is. Why would it not be defined it it got through the debugger. And I put the define code up there. What is the "#ifdef" used for? I know its to see if it was defined or not, but why would it not be defined?

appalsap
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Joined: 27 Apr 2006
Posts: 6753
Location: Pakistan

Posted: Sun Jul 08, 2007 6:35 pm Post subject:

it wouldnt be defined if you a) took out the line b) #undef it

jeremy6996
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Joined: 20 May 2007
Posts: 100

Posted: Sun Jul 08, 2007 6:37 pm Post subject:

appalsap wrote:

it wouldnt be defined if you

a) took out the line
b) #undef it

=P I see. But that brings up another one of my questions, why do people bother to #undef things?

appalsap
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Joined: 27 Apr 2006
Posts: 6753
Location: Pakistan

Posted: Sun Jul 08, 2007 6:40 pm Post subject:

jeremy6996 wrote:

why do people do this?

ok, say you were developing a shareware program, and have two editions, trial and full.

Code:

#ifdef FULL
do_awesome_stuff();
#else
obnoxious_message("sorry this feature is only enabled in the full version");
#endif

now you only have to #define FULL if you want to build the application for your registered users instead of maintaining two seperate programs.

jeremy6996
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Joined: 20 May 2007
Posts: 100

Posted: Sun Jul 08, 2007 6:42 pm Post subject:

Oh, I get it now thanks.

benlue
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Joined: 09 Oct 2006
Posts: 2142

Posted: Sun Jul 08, 2007 8:17 pm Post subject:

Question answered, locked.

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