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[irene89 <>]

Hi everybody, I'm new to C++ and CGAL. I'm tryng to obtain an alpha shape
from a point set in the plane and to do that I was first trying to run the
following example:

http://doc.cgal.org/latest/Alpha_shapes_2/Alpha_shapes_2_2ex_alpha_shapes_2_8cpp-example.html

with this set of point:
(0,2), (-0.5,1), (0,1), (0.5,1), (-2,0), (-1,0), (0,0), (1,0), (2,0),
(-0.5,-1), (0,-1), (0.5,-1), (0,-2)

The points are saved in a file data.txt with the same exact format above and
this file is in the same directory of the .cpp. Obviously I changed the line
in the example

  std::ifstream is("./data/fin", std::ios::in);

with the line

  std::ifstream is("data.txt", std::ios::in);

I compiled with
g++ prova.cpp -lCGAL -lgmp
and all went ok, but when I run it I had this error:

Reading 0 points from file
Alpha Shape computed
0 alpha shape edges
Segmentation fault (core dumped)

Any idea?
Thanks in advance for helping! 



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