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Macro to substitute the #ifdef DEBUG #endif pair

General and Gameplay Programming Programming

Started by Icebone1000 August 07, 2011 08:19 PM

3 comments, last by wqking 12 years, 8 months ago

Icebone1000

1,960

Author

August 07, 2011 08:19 PM

Is there a way to create a macro to accept anything as parameter, to avoid a bunch of ugly #ifdef DEBUG #endif?
I tried:



#ifdef _DEBUG

	#define DBG(param) param

#else

#define DBG(param)

#endif

But I cant use it, i.e., to initialize a debug only member in a initialization list:





myClass::myClass():var1(0) DBG(, var2(param) )

{..}

because of the comma, "param" is ignored..

Can I create a macro that just copy and paste everything?

Wooh

1,088

August 07, 2011 08:37 PM

I think you will have to surround the content you pass to the macro inside parenthesis.
DBG((, var2(param) ))

Icebone1000

1,960

Author

August 07, 2011 08:53 PM

I think you will have to surround the content you pass to the macro inside parenthesis.
DBG((, var2(param) ))

This doesnt work, cause the parenthesis goes to the initialization list, its not discarded..

Wooh

1,088

August 07, 2011 09:03 PM

First declare a macro for the comma and use that instead of the comma

#define COMMA ,

... DBG(COMMA var2(param) ) ...

I know, it is not very nice. I guess it's just easier to use #ifdef and #endif.

wqking

778

August 08, 2011 03:18 AM

First declare a macro for the comma and use that instead of the comma
#define COMMA , ... DBG(COMMA var2(param) ) ...
I know, it is not very nice. I guess it's just easier to use #ifdef and #endif.

That works on VC, also works on GCC for simple situation.
For complex macro, it can't compile.

Use this,



#define COMMA() ,

... DBG(COMMA() var2(param) ) ...

will work well.

However, on GCC, if COMMA() is passed to macro A, then A pass it to another macro, it will fail compile too.
So always using COMMA() as first level parameter.
VC doesn't have that limitation.

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Macro to substitute the #ifdef DEBUG #endif pair

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