Re: kernel coding style for if ... else which cross #ifdef

[Willy Tarreau]

On Sat, May 24, 2008 at 03:41:21PM +0100, Jeremy Fitzhardinge wrote:
> Willy Tarreau wrote:
> >You still have the possibility to use the "-0" trick :
> >
> > 	if (CFG_THINGY_LIMIT && x > (CONFIG_THINGY_LIMIT-0)) {...}
> >  
> 
> Oh, that's cute in a vile way.  I hadn't seen it before.

I use it in some of my code (but moderately). It's particularly useful
for limit checking such as above. It's useful too when you want to use
the config value as an offset or a bit shift. Eg:

    p = malloc(buf_size << (CONFIG_SHIFT-0));

Willy

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