Re: [boost] [smart_ptr] enable_shared_from_this_light

From: Peter Dimov (pdimov_at_[hidden])
Date: 2008-04-11 18:10:33

Daniel Frey:

> I attached a complete implementation of enable_shared_from_this_light
> which has an overhead of a single plain pointer. [...]

I agree that providing the ability to build this lightweight helper may be 
valuable to some. But I'm not sure that we should provide several esft 
classes in Boost (except possibly as examples). This of course raises the 
question of which esft base (of the three candidates we have) should be 
provided.

> The thing to note is that I added two more things to
> shared_ptr: _internal_shared_count() and a ctor which takes a
> detail::weak_count and the raw pointer.

I'd change the first argument of the new constructor to 
detail::shared_count.

I don't like your preferred spelling of the function. It doesn't reflect its 
semantics in my opinion. In shared_ptr<T> p( new T ), the T object is not an 
observer, but it does accept p as its owner.