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Hi,

I'm trying to run the example shown here:

http://www.cgal.org/Manual/3.3/examples/BGL_triangulation_2/emst.cpp
http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/BGL/Chapter_main.html#Subsection_56.5.1

I'm getting this output:

CGAL error: precondition violation!
Expr: ! is_infinite(e)
File: /usr/include/CGAL/Triangulation_2.h
Line: 825
terminate called after throwing an instance of 'std::logic_error'
  what():  basic_string::_S_construct NULL not valid
Aborted

This example uses a boost filtered graph to filter out infinite vertices and
edges.

However, this filter is only invoked for the vertices, it's not invoked for 
the
edges at all. I can verify this by placing a print statement in the ()
operator.

Therefore, the msp computation encounters an infinite edge and fails.

I'm using Ubuntu's cgal2 and boost pre-installed packages.

 - Godmar

ps: the input is here:
$ cat data/graph.cin 
1 2
4 5
7 8
3 5
9 6
5 6
4 3
5 5
7 4