[ITK] [ITK-dev] include file header double underscore

[Bill Lorensen]

Simon,

Apparently the use of _ and __ is reserved and newer c++'s warn about
it. These changes were made back in December 2014...
http://itk.org/gitweb?p=ITK.git;a=commit;h=4d8c82c5bfdf340a4201e91d7d35694852328199

http://stackoverflow.com/questions/228783/what-are-the-rules-about-using-an-underscore-in-a-c-identifier

What backward compatibility issues do you see?

Bill

On Fri, Feb 19, 2016 at 12:14 PM, Simon Warfield
<simon.warfield at childrens.harvard.edu> wrote:
>
> Did itk include file ifndef lines lose their double underscore at some
> point?
> Was there a reason for that ?  It has an impact on backwards compatibility.
>
> http://www.itk.org/Doxygen47/html/itkAbsImageFilter_8h_source.html
> line 18 :
> #ifndef __itkAbsImageFilter_h
>
> http://www.itk.org/Doxygen48/html/itkAbsImageFilter_8h_source.html
> line 18 :
> #ifndef itkAbsImageFilter_h
>
>
> --Simon
>
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