The PR #1791 introduced `CGAL::Point_set_3`, and factorized the
`Property_map` implementation of `Surface_mesh` into a new class
template `CGAL::Properties::Property_map<Key, T>`.
The backward compatibility was supposed to be ensured by the fact that
`Surface_mesh<Point>::Property_map<Key,T>` had
`Properties::Property_map<Key, T>` as base class. But that compatibility
was only partial, and there could be ambiguities in the calls to `get`
and `put` with those property maps.
This commit/PR renamed `Properties::Property_map` to
`Properties::Property_map_base`, and added a third parameter, used as
the `Derived` class in the CRTP used by `boost::put_get_helper`. That
way, the `get` and `put` functions are defined directory on the real
class `Surface_mesh::Property_map<Key, T>` and not on its base class.
The same has been modified in `CGAL::Point_set_3`.
That makes the use of `Property_base_base` and `Property_container` a
little trickier, but that removes several ugly non-portable hacks, like
the `reinterpret_cast` that were used to convert a pointer to base class
of the pmap to the pointer the real pmap. Now that is a lot cleaner.
I have verified that the documentation is not modified. Actually, the
PR #1791 did modify the documentation of `Surface_mesh` (see the member
method `add_property_map` for example), and this PR fixes the situation:
the documentation of `Surface_mesh` is put back to the version in
CGAL-4.9.
Laurent Rineau
Sébastien Loriot
Simon Giraudot
Andreas Fabri