Re: Accessing a class pointer and class methods

[Owen Taylor <otaylor redhat com>]

On Sun, 2003-07-13 at 02:15, Gaal Yahas wrote:

> What I still want to know is what is the proper way to implement instance
> finalization when the object is a GObject and not a GtkObject (GtkObjects
> have a "destroy" signal I can conncet to). See the example below: how
> do I have unique_thing_finalize called, say, when the thing's refcount
> drops to zero?

There are lots of examples in GTK+ of non-GtkObject GObjects, 
look at the handling gtk_list_store_finalize (GObject *object) for a
random example. Note the fact that every finalize function must
chain up to the parent class (and hence the assignment of parent_class
in class_init)

> uniqething.c:
>
>      static GHashTable *thing_cache;
>
>      void
>      unique_thing_class_init() {
>          thing_cache = g_hash_table_new(g_str_hash, g_str_equal);
>      }
>      void
>      unique_thing_class_finalize() {
>          g_hash_table_destroy(thing_cache);
>      }

Unless you have a dynamically loaded class, there is no reason to
have a class_finalize; class finalizers are only ever called for
dynamically loaded classes. Otherwise, you can just count on the
OS freeing the memory when the program exits in most cases.

Regards,
                                                Owen