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Macro thing...

Javelin · 2003-08-19T08:18:03

Hi Is it possible in C/C++ to make a macro with unspecified number of parameters? E.g. calling printf() with a macro. #define PRINTF(x,...) printf(x,...) Surely not like this but I think you catch my drift // Javelin -- Why do something today when you can do it tomorrow... -- [edited by - Javelin on August 18, 2003 7:01:27 PM]

General and Gameplay Programming Programming

Started by Javelin August 18, 2003 06:00 PM

13 comments, last by Javelin 20 years, 8 months ago

Javelin

122

Author

August 19, 2003 06:25 AM

ok...

Guess I have to solve it some other way then.. :
Thank you all for you help...

--- edit ---

quote:
Of course, you could do it with all sorts of operator overloads. Should you? It depends upon the situation .

gahhh... Don't want to even think about it... it would become hundreds of functions... :D
I can see the benefit of it in a situation that differ from mine though...

// Javelin
-- Why do something today when you can do it tomorrow... --

[edited by - Javelin on August 19, 2003 7:29:07 AM]

// Javelin// Assumption is the mother of all fuckups...

genne

122

August 19, 2003 06:40 AM

quote:Original post by Beer Hunter
In C++, I''m not aware of any standard way. However, there''s another way to get the same effect for this example: #define PRINTF printf

Javelin: Did you even try this?

dagarach

169

August 19, 2003 07:09 AM

#ifdef _NODEBUG_  #define DEBUGTXT //#else  #define DEBUGTXT debug.Write#endif

That should do the trick. However, try it, don''t trust it as the relationship between comments and the preprocessor varies between compilers.

Another way would be to make debug.write inline, and #ifdef the contents of the function. Hey presto! no code generated.

Desert Fox

277

August 19, 2003 07:52 AM

#ifdef _NODEBUG_
#define DEBUGTXT if (true) ; else debug.Write
#else
#define DEBUGTXT if (false) ; else debug.Write
#endif

Any halfway decent compiler should optimize out code in an else block that never executes. You could do something similar though, if you have your Debug class, or whatever, overload operator (). IE:

class Debug{//...classtemplate <class U>Debug& operator ()(const U& msg){    // output msg    return *this;}};#define DEBUGTXT if (false) ; else debug//Then use it like so:DEBUGTXT("An error has occured: Value = ")(myVariable)

desertfox

"Is life so dear, or peace so sweet, as to be purchased at the price of chains and slavery?" - Patrick Henry

Javelin

122

Author

August 19, 2003 08:18 AM

quote:
Javelin: Did you even try this?

Damn... nope... missed (or forgot) it... :\
But yes... it should work for my pupose. I don''t like the comment thing though (as in dagarach example), but I don''t think it could cause too much trouble.

The way Desert Fox points out should work as well.

Thanks againg for your time. :D

// Javelin
-- Why do something today when you can do it tomorrow... --

// Javelin// Assumption is the mother of all fuckups...

Macro thing...

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