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["Max" <>]

Hi,

I found the code in Nef_polyhedron_iostream_3.h:

template <typename Kernel, typename Items, typename Mark>
std::ostream& operator<<
 (std::ostream& os, Nef_polyhedron_3<Kernel,Items,Mark>& NP)
{

Should the line
 (std::ostream& os, Nef_polyhedron_3<Kernel,Items,Mark>& NP)
be 
 (std::ostream& os, const Nef_polyhedron_3<Kernel,Items,Mark>& NP)
                   ^^^^^^^
?

If that's true, its forward declaration and friend declaration in class
Nef_polyhedron_3 should be corrected as const, and SNC_io_parser.h stuff.

I attemped to 'correct'(if I'm correct :-)) the files 
Nef_polyhedron_iostream_3.h
and Nef_polyhedron_3.h, but that seems to be not simple in file 
SNC_io_parser.h.
So I've rolled back my change.

Thanks.
Max