Adds a weak reference callback to an object. Weak references are
used for notification when an object is finalized. They are called
"weak references" because they allow you to safely hold a pointer
to an object without calling g_object_ref() (g_object_ref() adds a
strong reference, that is, forces the object to stay alive).
Note that the weak references created by this method are not
thread-safe: they cannot safely be used in one thread if the
object's last g_object_unref() might happen in another thread.
Use #GWeakRef if thread-safety is required.
Adds a weak reference callback to an object. Weak references are used for notification when an object is finalized. They are called "weak references" because they allow you to safely hold a pointer to an object without calling g_object_ref() (g_object_ref() adds a strong reference, that is, forces the object to stay alive).
Note that the weak references created by this method are not thread-safe: they cannot safely be used in one thread if the object's last g_object_unref() might happen in another thread. Use #GWeakRef if thread-safety is required.