Re: [boost] [smart_ptr] trunk versionof enable_shared_from_thisincompatible with TR1

From: Frank Mori Hess (frank.hess_at_[hidden])
Date: 2008-04-30 17:21:05

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Wednesday 30 April 2008 13:42 pm, Peter Dimov wrote:
> In principle, a new esft may avoid this by:
>
> 1. Allowing only (expired) weak_ptr instances to be created in the
> constructor;
> 2. Bringing the weak_ptr instances back to life once a shared_ptr takes
> ownership.
>
> This however seems to require a relatively major surgery to sp_counted_base
> and friends; I'm not sure I'm comfortable with that.

It sounds like you're heading in the direction of the "shared_from_that" idea 
I floated earlier:

http://lists.boost.org/Archives/boost/2008/04/135372.php

which would allow client code to distinguish between the cases of "shared_ptr 
not available yet" and "shared_ptr expired".

- -- 
Frank
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)

iD8DBQFIGOLC5vihyNWuA4URAlY7AJ992n4FL79aROGdGyZTsAA5Uv/ylACfbKmA
OZDzTSDXTOAsRCRdqU8kQnY=
=Xz99
-----END PGP SIGNATURE-----