[Insight-developers] ZeroIndex

[Bill Hoffman]

I can live without it.   I guess the fix is to replace each
use with a Fill call?   OK, who wants the job?

-Bill


At 11:21 AM 8/27/2002 -0400, Miller, James V (Research) wrote:
>Can we do without ZeroIndex?  
>
>Index now has a Fill() method so it is fairly easy to create an 
>index and set it to zero. Or we can make sure the default constructor
>initializes to zero (we are currently relying on the compiler
>generated constructor).
>
>'Course the benefit to having the ZeroIndex static was that 
>we could avoid one constructor call per use.
>
>I only count about 20 places it is used (outside the Examples
>and Testing). Add another 40 occurances in Examples and Testing.
>
>
>
>> -----Original Message-----
>> From: Bill Hoffman [mailto:bill.hoffman@kitware.com]
>> Sent: Tuesday, August 27, 2002 10:07 AM
>> To: insight-developers@public.kitware.com
>> Cc: James V. Miller
>> Subject: [Insight-developers] ZeroIndex
>> 
>> 
>> OK, there is only one static left that is breaking the 
>> compile on the Mac.
>> 
>> template<unsigned int VIndexDimension=2>
>> class Index {
>> public:
>>   static const Self ZeroIndex;
>> ...
>> 
>> 
>> // Set the const definition of the ZeroIndex. This uses the aggregate
>> // initialization shortcut to assign all the data in the 
>> aggregate to zero.
>> template<unsigned int VIndexDimension>
>> const Index<VIndexDimension>
>> Index<VIndexDimension>
>> ::ZeroIndex = {{0}};
>> 
>> 
>> However, this one seems a bit harder to remove than the rest of them.
>> Any ideas?
>> 
>> To get around the problem, you can add explicit 
>> instantiations for Index.
>> 
>> template class itk::Index<2>; 
>> template class itk::Index<3>; 
>> template class itk::Index<4>; 
>> template class itk::Index<5>; 
>> 
>> This gets around the problem on the Mac, but if you ever 
>> template over a different
>> number, it will not work.
>> 
>> -Bill
>> 
>> 
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