Adds a weak reference from weak_pointer to object to indicate that
the pointer located at weak_pointer_location is only valid during
the lifetime of object. When the object is finalized,
weak_pointer will be set to NULL.
Note that as with g_object_weak_ref(), 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 from weak_pointer to object to indicate that the pointer located at weak_pointer_location is only valid during the lifetime of object. When the object is finalized, weak_pointer will be set to NULL. Note that as with g_object_weak_ref(), 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.