[C++-sig] Best way to register shared_ptr<const T>

[Hans Meine]

Am Donnerstag, 24. Januar 2008 23:00:02 schrieb Alex Mohr:
> Boost.python has special-case code for shared_ptr.  When boost.python
> creates a shared_ptr for a class, it supplies a special custom deleter
> that tracks the python object identified with the c++ object.

For the first time, I begin to see this clear.  So.. this only works if 
boost::python creates the shared_ptr?  E.g. if I have a method

shared_ptr<Foo> createFoo() { ... }

Will boost::python be able to retroactively add the custom deleter?  AFAICS, 
this is impossible, because the shared_ptr might be actually shared, so BPL 
cannot re-wrap the pointer in another shared_ptr... yes it can, if the custom 
deleter stores a reference to the original shared_ptr?

Ciao, /  /
     /--/
    /  / ANS