[Bug libstdc++/55123] [C++11] Construction of shared_ptr<const T> from unique_ptr<const T> fails

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55123

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2012-10-29
         AssignedTo|unassigned at gcc dot       |redi at gcc dot gnu.org
                   |gnu.org                     |
     Ever Confirmed|0                           |1

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-10-29 18:06:39 UTC ---
This is basically the same problem as prevents std::vector<const int>, but
since using an allocator for that shared_ptr(unique_ptr&&) constructor is an
implementation detail and not required I suppose it should work.

The problem is that (unlike boost::shared_ptr) we don't have separate
_Sp_counted_deleter and _Sp_counted_deleter_with_allocator.