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Date: Fri, 6 Jul 2001 00:10:29 +0200
From: "J . A . Magallon" <jamagallon@able.es>
To: Davide Libenzi <davidel@xmailserver.org>
Cc: David Woodhouse <dwmw2@infradead.org>, linux-kernel@vger.kernel.org
Subject: Re: linux/macros.h(new) and linux/list.h(mod) ...
Message-ID: <20010706001029.A11790@werewolf.able.es>
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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
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