Re: [Boost-users] does ptr_* solves this?

From: Thorsten Ottosen (tottosen_at_[hidden])
Date: 2006-04-03 09:41:17

me22 wrote:

 > On 4/1/06, Marco Correia <mvc_at_[hidden]> wrote:
 >
 >> B* obj = my_alloc<D>::allocate(1);
 >> obj = new (obj) B();
 >> container.insert(obj);
 >>
 >> My problem is that when an object is removed from the container, I 
have to
 >> explicitely deallocate it from my allocator, but the static info was 
lost, so
 >> I cannot do
 >>
 >> my_alloc<?>::dealloc
 >> I've asked in boost irc channel, and someone told me ptr_* boost 
libraries
 >> solve this problem, is this correct?
 >>
 >
 >
 > I don't think that the ptr_ ones will, but shared_ptr allows you to
 > specify a custom deleter at construction, which seems to be to be just
 > what you need.

Well, if you need to keep the exact type around, you can use typeid().
But you need that both with shared_ptr and ptr_vector.

With ptr_vector, you can plug your allocator into new_clone() and 
delete_clone().

-Thorsten