Re: [Boost-users] [shared_from_this] why doesn't _internal_weak_this need to be initialized?

From: Frank Mori Hess (fmhess_at_[hidden])
Date: 2008-05-18 00:32:34

On Sunday 18 May 2008 00:10, Jose Martinez wrote:
> In the shared_from_this() function of the enable_shared_from_this base
> class, the weak pointer _internal_weak_this is never initialized.  Why
> is that so?  The use_count of the _internal_weak_ptr is at least 1 as
> long as there is a shared_ptr already pointing to *this.  How does the
> un-initialized weak_ptr know that there is a shared_ptr already created
> and how can it access the number of references?  I'm sure there is a
> simple explanation that I am not catching in my readings.

It gets initialized by the shared_ptr constructor.

-- 
Frank