[vtk-developers] ComputeRange setting array's information object

[David Gobbi]

Hi All,

I was looking at vtkDataArray's ComputeRange code, and saw these:

void vtkDataArray::ComputeRange(double range[2], int comp)
line 1102:  info->Set( PER_COMPONENT(), infoVec );
line 1112:  infoVec->SetNumberOfInformationObjects( this->NumberOfComponents );
line 1154:  info->Set( rkey, range, 2 );

Now, I always understood that it was necessary to be careful with
calling GetRange() as far as thread safety is concerned.  However,
these info->Set... calls surprised me.  Their presence means that
ComputeRange() is non-reentrant in a very bad way.

Is there a reason why ComputeRange() has to modify the array's
info object?

  David