RE: [gtk-list] Re: style usage + memory leak

[smolitor insight-tech com (Stephen Molitor)]

Phew!  What a relief.  The universe makes sense again.

Seriously, thanks for the reply Owen.  I didn't realize that styles were not
inherited from GtkObject.  I was afraid that maybe you had to manage memory
for every widget / GtkObject you created.  Having to remember to unref just
for things outside the GtkObject hierarchy doesn't seem to bad.

Steve Molitor
smolitor@insight-tech.com

-----Original Message-----
From: Owen Taylor [mailto:otaylor@redhat.com]
Sent: Thursday, October 29, 1998 1:45 PM
To: gtk-list@redhat.com
Subject: [gtk-list] Re: style usage + memory leak



smolitor@insight-tech.com (Stephen Molitor) writes:

> Robert Roebling wrote:
>
> > No. When I create the style, its ref count is 1. When I then
> > assign it to a widget, I assume the widgets will raise the
> > ref count to 2. Without unref after assigning it the widget
> > would unref the style upon its own destruction leaving
> > the ref count at 1 -> memory leak.
>
> I thought that when you created something in Gtk+, it was "floating," with
> no reference count, until you assigned it to something.  So when you
create
> the style, it is "floating" (ref count 0), until you assign it to a
widget,
> raising the ref count to 1.  The danger zone is when
> an object is "floating," the interval between when it is created and when
it
> is assigned to something.  If you create the style and don't assign it to
> any widget, then you would have a memory leak.

That system only applies to GtkObject and its descendents
(GtkWidget, GtkAdjustment, ...)

All other things in GTK+ and GDK - GdkWindows, GtkStyle, etc,
reference count "normally" - the reference count is 1 upon
creation, and you are responsible for dereferencing them.

Often, this means creating an object, passing it to GTK+, then
unreferencing it immediately -

 pixmap = gdk_pixmap_create_from_xpm_d (...);
 widget = gtk_pixmap_new (pixmap, NULL);
 gdk_pixmap_unref (pixmap);

Regards,
                                        Owen

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