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[petitmalin <>]

hi, 
thank you for your reply really rapid. 
In fact, my program uses Delaunay triangulation during the whole process
except at the last step, I want to do some local modifications of the
triangulation but without the Delaunay triangulation constraint. That's why
I want to crate a simple triangulation which is copied from the Delaunay and
the local modifications could be done with this new triangulation. 

I have tested the tds.swap() but it does not work. In fact, if we have
simple Triangulatio1, Triangulation2, and Delaunay1,Delaunay2.  We can have
Triangulation1.tds()=Triangulation2.tds() and
Delaunay1.tds()=Delaunay2.tds(), but never
Triangulation1.tds()=Delaunay1.tds() with CGAL. Note also that in the
typedefs, we use exactly the same Triangulation_data_strcture_3 for both
simple triangulation and Delaunay triangulation. 

Do you have any suggestion about my problem? best regards

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