Re: [boost] Re: Re: Re: what happened to allocators in boost?

From: Douglas Gregor (gregod_at_[hidden])
Date: 2003-08-26 12:42:21

On Tuesday 26 August 2003 01:23 pm, Peter Dimov wrote:
> Leaving aside the issue of whether specializing std::allocator<MyClass> is
> a good idea:
>
> shared_ptr< MyClass, MyAllocator > s;
>
> note that you now wouldn't be able to pass s to a function that expects
> shared_ptr<MyClass> since the type is not the same.

There's no reason shared_ptr couldn't support a constructor that takes an 
allocator as an argument. Then sp_counted_base_impl would also take an 
Allocator parameter (heh, the allocator it was in fact allocated with) and 
would know how to deallocate itself via a (copy of) this allocator. We'd get 
allocator support without putting the allocator into the type of shared_ptr 
(just like we have deleter support).

        Doug