Re: AW: Attach invisible data to a TreeRow?

[Murray Cumming <murrayc murrayc com>]

On Sun, 2005-12-18 at 12:21 +0100, Marco wrote:
> On Sun, 18 Dec 2005 03:43:17 -0600, Paul Davis  
> <pjdavis engineering uiowa edu> wrote:
> 
> > Murray Cumming wrote:
> >
> >> On Fri, 2005-12-16 at 22:38 +0100, Marco wrote:
> >>
> >>> http://www.gtkmm.org/docs/glibmm-2.4/docs/reference/html/classGlib_1_1RefPtr.html
> >>> http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/ch18s02.html
> >>>
> >>
> >> RefPtr is not meant to be a general-purpose smartpointer. I don't
> >> recommend using it with Widgets.
> >>
> >>
> > Unless I've completely misunderstood the entire memory managemeny scheme  
> > used by Gtk, once you call Gtk::manage(), you release all control of  
> > memory management to the library.  In other words, explicitly calling a  
> > widget's destructor ( or implicitly via smart pointer reference counting  
> > ) would be 'bad'.  I say 'bad' cause I'm not really sure what you'd run  
> > into.

Deleting a managed _widget_ is normally OK. The container can detect
that and just remove the widget.

>   I imagine you'd start getting things like memory corruption  
> > errors or those fun messages about freeing the same memory segment  
> > multiple times.  Anyway, thats just how I had understood things.
> >
> > Paul
> 
> manage() makes the container responsible for deleting the widget so it  
> would not be usefull in a case where you temporarily want to remove the  
> widget from its container.

Not necessarily. When you remove a managed widget then you are
responsible again. When you add it to a container again, then the
container is responsible.

> That is a case where you have to delete manually or use a smartpointer.
> 
> --
> Marco
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-- 
Murray Cumming
murrayc murrayc com
www.murrayc.com
www.openismus.com