Re: linux/macros.h(new) and linux/list.h(mod) ...

J . A . Magallon
2001-07-05T22:10:35Z

On 20010705 Davide Libenzi wrote:
>
>On 05-Jul-2001 David Woodhouse wrote:
>>
>> davidel@xmailserver.org said:
>>> This patch add a new linux/macros.h that is supposed to host utility
>>> macros that otherwise developers are forced to define in their files.
>>> This version contain only min(), max() and abs().
>>
>> Consider min(x++,y++). Try:
>>
>>#define min(x,y) ({ typeof((x)) _x = (x); typeof((y)) _y = (y); (_x>_y)?_y:_x;
>>#})
>>#define max(x,y) ({ typeof((x)) _x = (x); typeof((y)) _y = (y); (_x>_y)?_x:_y;
>>#})
>
>Yep, it's better.

And there could be others also usefull:

#define ztst(x,y) (x ?: y) // `x' if that is nonzero; otherwise, of `y'

If g++ extensions worked in plain C, you just could write:
#define min(x,y) (x <? y)
#define max(x,y) (x >? y)

--
J.A. Magallon # Let the source be with you...
mailto:jamagallon@able.es
Mandrake Linux release 8.1 (Cooker) for i586
Linux werewolf 2.4.6-ac1 #2 SMP Thu Jul 5 01:15:49 CEST 2001 i686