Re: [Re: [Re: [Re: [Re: [Re: [Re: [Re: [[gtkmm] technical question: GTKMM_LIFECYCLE]]]]]]]]

[Murray Cumming <murrayc usa net>]

MHL Schulze t-online de (Martin Schulze) wrote:
> Am 02.10.2002 11:25 schrieb(en) Murray Cumming:
> > > Do we want the gtk containers on destruction to force
> > > the destruction of our objects
> > 
> > Yes we do. That's what GTK+ does and that's what we wrap. We already
> > default
> > to the more C++-like behaviour so I don't see a need to add a 3rd system
> > just
> > yet. It's something that you could think about for gtkmm3 but it must be
> > gtkmm-wide, not just for gstreamer.
> 
> Okay. I will search the ml for Karls comments about manage() I have
> in mind that tell something different about the meaning of manage().

Well, he hasn't been involved with gtkmm2 development so I don't see how
that's relevant.

> Meanwhile I can life with the policy in gtkmm as I have before.
> However you must notice that gstmm must be different because gstreamer's
> containers don't force the destruction of their children. Since the use
> of boost::shared_ptr<> doesn't work with unmanage()ed objects I will
> keep things like I have implemented them at the moment and recommend
> users to write "Gst::RefPtr<Gst::Pad> my_pad = Gst::manage(new Gst::Pad);"
> (or whatever the smartpointer will be named) if they want the lifetime
> of their objects to be controled by a reference counter.

Basically, you need to ask yourself whether you can live with me adding this
sentence to the gtkmm FAQ about manage():
"Please note that the gstreamer C++ bindings use a manage() function, but that
that function does not do the same thing as Gtk::manage(). The gtkmm
developers think that is a bad API decision in the gstreamer C++ bindings."

Personally, I'd prefer not having to say that.

And note that you are not just adding a Gst::manage() function so you can't
pretend that it is clearly separate. The way that you've coded it,
Gtk::manage() and Gst::manage() are interchangeable - but Gst objects would
not behave as expected when used with Gtk::manage().


Murray Cumming
murrayc usa net
www.murrayc.com