Re: strange "warning: operation on '...' may be undefined"
Re: strange "warning: operation on '...' may be undefined"
- Subject: Re: strange "warning: operation on '...' may be undefined"
- From: Wes Peterson <email@hidden>
- Date: Sat, 20 May 2006 07:24:39 -1000
There is no guarantee which, count++ on the left, or count-1 on the
right, will
be done first. That is C. --Wes
-----------------------------------------------
On May 20, 2006, at 7:04 AM, nick briggs wrote:
Hello
I'm trying to fix all my compile warnings, this is my last one and
its got me stumped:
"warning: operation on 'count' may be undefined"
The strange thing is the warning is only generated on the line shown
below, while I am performing ++count elsewhere without generating a
warning.
This is in a .m file
CGPoint sampledPoints[size*2];
int count = 0;
sampledPoints[count].x = 0.0;
sampledPoints[count].y = (float)((buffer[0]*_size)/
_scale)+h/2;
sampledPoints[++count].x = 1 * xstep;
sampledPoints[count].y = (float)((buffer[1]*_size)/
_scale)+h/2;
UInt32 i;
for (i = 1; i < size; i+=_resolution){
sampledPoints[++count].x = sampledPoints[count-1].x;
<<<<-- warning here
sampledPoints[count].y = sampledPoints[count-1].y;
sampledPoints[++count].x = (float)xstep * i;
sampledPoints[count].y = (float)((buffer[i]*_size)/
_scale)+h/2;
}
Any help much appreciated
Nick
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