Hi Brian,
Thanks for the reply.
I think I had some confusion here, I thought GObject is part of GLib, and
apparently that's not true.
The scenario is that I need to temporary update the screen, and store the
old widgets on the list. So if I did not explicitly add the ref count, the
objects would be destroyed once they are removed from parent (even if I
stored the object reference in g_list).
I think I would use a general helper function for list insert remove then.
Just want to make sure I did not miss something obvious.
And I would move my future questions to gtk-app-devel-list :P
Thanks again.
walty
Brian J. Tarricone wrote:
[Note that your question is probably more appropriate for
gtk-app-devel-list or gtk-list; this list is for the development *of*
glib/gtk itself, not about developing apps that *use* glib/gtk.]
On 05/14/2009 08:47 PM, walty wrote:
However, one thing that surprised me is that, when I do g_list_append
or
g_list_prepend, it does not automatically add the reference count of
the
stored GObject (unlike objective-C).
GList is a generic container that you can put any kind of pointer into.
It doesn't know about GObjects or reference counting. In fact libglib
(where GList is implemented) doesn't even link to libgobject.
So do I need to explicitly add the reference count each time the GObject
is
inserted? and reduce the reference count when the object is removed? That
seems quite cumbersome to me.
That depends on how you want to use it. If you can be sure no one else
will destroy the object while you're using it in the list, then no, you
don't.
I've used both glib/gobject and NSArray/NSDictionary/etc., and
personally I don't find either approach to be better or worse. I rarely
need to increase refcnts on GObjects when I store them in lists, but
perhaps others have different use cases that do require this.
Or can I add some function pointer to generalize this? Is there some kind
of
best practice on this?
If you add the objects in one shot, you can do something like this after
you've added all objects:
g_list_foreach(list, (GFunc)g_object_ref, NULL);
Of course that iterates over the entire list, so it would be a bit slow
on a large list. You can always ref the objects as you insert them, e.g.:
list = g_list_append(list, g_object_ref(obj));
Of course you have to do something similar with _unref() when you remove
items from the list or destroy the list.
-brian
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