CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

On 11/12/2013 03:00 PM, hidding wrote:
> Hi,
>
> I'm trying to compute persistence diagrams from Alpha-shapes. I used the
> example code from the manual on Alpha_shape_3, and then output the entire
> filtration (for use with the "phat" library) using the
> Alpha_shape_3::filtration() method. However I don't completely understand
> how this method accesses the OutputIterator. The alpha_shape_3 header file
> contains the following line:
>      at /usr/include/CGAL/Alpha_shape_3.h:978
> 978          it++ = make_object(vh);
>
> This complicates the writing of an output iterator in two ways. Having to
> define the post-fix (++) operator seems unnecessary, and even then it should
> be "*it++" instead. Is this a bug? Does anyone have a working example to get
> this job done?
It's a bug. It is missing the star. I have already fixed it and will be 
in the next release of CGAL.

In the meantime, you can add the *.

Sebastien.

> I'm using version 4.2 of CGAL, shipped with Ubuntu 13.10.
>
> Thanks, Johan
>
>
>
>
> --
> View this message in context: 
> http://cgal-discuss.949826.n4.nabble.com/Using-Alpha-shape-3-filtration-tp4658389.html
> Sent from the cgal-discuss mailing list archive at Nabble.com.