• Helmut Leitner (5/46) May 03 2003 I can't understand why there was no release fixing the bug in the meanti...
• Walter (5/6) May 03 2003 meantime.

Helmut Leitner <helmut.leitner chello.at> writes:

On Apr 6 2003 I wrote to Walter Bright:
 
 Walter,
 
 a number of floating point type arrays don't sort correctly under certain
 circumstances. This is the code:
 
 class TypeInfo_d : TypeInfo
 {
  ...
     int compare(void *p1, void *p2)
     {
         return *(double *)p1 - *(double *)p2;
     }
  ...
 }
 
 When values are small (I tried to sort uSecond timings like the following):
 
    sectab[0] 0.0000070792
    sectab[1] 0.0000072514
    sectab[2] 0.0000066818
    sectab[3] 0.0000067485
    sectab[4] 0.0000066986
    sectab[5] 0.0000068492
    sectab[6] 0.0000066601
    sectab[7] 0.0000065775
    sectab[8] 0.0000068234
    sectab[9] 0.0000067371
    sectab[10] 0.0000067350
 
 rounding will make the return value unusable and the array remains unsorted.
 I think similar problems would turn up, when numbers are too large for the
 int range.
 
 The typical construction that you use in other places, will avoid the problem:
 
    type a = *(type *) p1;
    type b = *(type *) p2;
    return a < b ? -1 : a > b ? 1 : 0;
 
 ...

I can't understand why there was no release fixing the bug in the meantime.

--
Helmut Leitner    leitner hls.via.at   
Graz, Austria   www.hls-software.com

"Walter" <walter digitalmars.com> writes:

"Helmut Leitner" <helmut.leitner chello.at> wrote in message
news:3EB3B096.838DB3BB chello.at...
 I can't understand why there was no release fixing the bug in the

meantime.

Because I'm trying to get the linux version working. In the meantime, you
can apply the workaround you specified. I apologize.