Re: [boost] [smart_ptr] enable_shared_from_this enhancement

From: Frank Mori Hess (fmhess_at_[hidden])
Date: 2008-03-17 01:42:49

On Monday 17 March 2008 01:36, Frank Mori Hess wrote:
> The implementation I've got in mind (haven't actually tried it yet)
> would work as follows.  I'd add two shared_ptrs to
> enable_shared_from_this, call them "internal_shared" and
> "external_shared".  external_shared would be assigned the external
> shared_ptr which first takes ownership of *this. internal_shared would
> be initialized with the "this" pointer, and a custom deleter which would
> reset external_shared.  internal_shared would be reset right after
> external_shared is initialized (when an external shared_ptr takes
> ownership of *this).  Any calls to shared_from_this() that occur prior
> to an external shared_ptr taking ownership of *this (such as in the
> constructor) would get a copy of internal_shared.

Hmm, actually nevermind.  This scheme isn't good enough yet, as I'd also 
want a weak_ptr copy of internal_shared to recognize the case where the 
object is still being kept alive by a copy of external_shared.

-- 
Frank