Re: slot from a reference pointer

[Paul Davis <paul linuxaudiosystems com>]

On Wed, 2006-10-11 at 23:23 +0300, Paul Pogonyshev wrote:
> Paul Davis wrote:
> > On Wed, 2006-10-11 at 21:15 +0300, Paul Pogonyshev wrote:
> > > Hi,
> > > 
> > > Is there a standard way of getting a sigc++ slot from Glib::RefPtr to
> > > an object?  I know that I can `steal' the object using operator->(),
> > > but is there a standard way?
> > 
> > its a bad idea anyway. i wrote last month about the perils of using
> > boost::shared_ptr<T> in slots. it makes life quite complicated.
> 
> All Gtkmm objects inherit sigc::trackable (AFAIK), so it makes little
> sense to add a reference if you create a slot for an object.  If you
> _really_ want to make slot keeping object alive, you could add a
> reference by hands. 

but thats exactly what you would be doing. the slot would have a RefPtr
stored within it that kept the refcnt up and thus the object alive.

in boost, you can use weak_ptr<T> to get around this, but RefPtr (AFAIK)
has no equivalent in part because its not intended to be a general
purpose shared pointer implementation.