[Insight-developers] Help to debug on LInux64 and Mac 10.5

[Bill Lorensen]

Guys,

Actually, it's not the overflow that is the problem. The p is different,
because part of the key is a pointer! Even though the x,y,z coodinates of a
point may be equal in an itkQuadEdgeMeshPoint, the additional part of the
class may be different.

Hmmm... somehow we need to limit the length of the key to the coordinate
part.

Bill
On Dec 20, 2007 7:57 PM, Bill Lorensen <bill.lorensen at gmail.com> wrote:

> OK, the 64 bit output shows that for (0, 0, 1) there are two different has
> codes generated.
> The codes differ after the first time the hash overflows.
> ...
> hash before: 1075801880
> p now      : 63
> hash after : 1207645527
> hash before: 1207645527
> p now      : 4
> hash after : 1187547931
>
> ...
> hash before: 1075801880
> p now      : 63
> hash after : 1207645527
> hash before: 1207645527
> p now      : -1
> hash after : 1187547926
>
> This shows that the overflow has two different results.
>
> Bill
>
> On Dec 20, 2007 4:48 PM, Sean McBride <sean at rogue-research.com> wrote:
>
> > On 12/20/07 4:24 PM, Bill Lorensen said:
> >
> > >I it's OK. It is meant to hash an arbitrary object.
> > >
> > >Can you attach the output?
> >
> > Attached is my code change and the output.  Also, I have done a second
> > build with all the same settings except 32 bit, and the test passes
> > there.  Output also attached.
> >
> > >The length of the key for
> > >itkMesh is 12 while the length of the key for itkQuadEdgeMesh is 20.
> >
> > In 32 bit, I note that the length is indeed 20 bytes.  But in 64 bit, as
> > I said before, it is 32 bytes (sic).  Can you explain why you expect 20?
> >
> >
> > --
> >  ____________________________________________________________
> > Sean McBride, B. Eng                 sean at rogue-research.com
> > Rogue Research                         www.rogue-research.com
> > Mac Software Developer              Montréal, Québec, Canada
> >
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.itk.org/mailman/private/insight-developers/attachments/20071221/9a3618e2/attachment.html