Author: Dieter Buerssner
Date: 14:03:53 08/08/03
Go up one level in this thread
On August 08, 2003 at 16:51:52, Gerd Isenberg wrote:
>On August 08, 2003 at 16:30:22, Dieter Buerssner wrote:
>
>>On August 08, 2003 at 16:15:26, Gerd Isenberg wrote:
>>
>>>Btw. if your row function is unsigned, it may cheaper to ask:
>>>
>>> if( (row(u)-1) < (7-1) )
>>
>>Hmm, shouldn't it be
>> if( ((unsigned)row(u)-2) < (7-2) )
>
>Hi Dieter,
>
>is the unsigned cast necessary if row(int) is unsigned?
No. But I just wanted to emphasize it.
>Ahh i see, macros instead of inlines ;-)
And make it independent from the prototype of row or the exact macro. I think,
here is not much difference between macro and function. Actually, for something
like row, I think there is not much need, to avoid a macro. In some cases, it
might be more efficient (for example, when some type promotion would be needed
for the argument in function version)
>The original statement was for row 0..7 i guess
>
> if( row(u) != 0 && row(u) != 7 ) {
>or
> if( row(u) > 0 && row(u) < 7 ) {
>if i subtract 1, 0 becomes UINT_MAX and 7 becomes 6.
>So below 6 or 7-1 seems correct to me.
Gerd, you are of course right. I don't know, what I was thinking (actually I
almost know, but it is too embarrassing to spell it out :-).
Regards,
Dieter
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