[boost] Status of clone_ptr?

From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2007-08-23 10:11:27

There was once a proposal for the addition of a clone_ptr, and 
eventually poly_obj (same without pointer interface) to the boost smart 
pointers.

I would have liked to know what the status of this is.