Specifies the type of function passed to g_dataset_foreach(). It is called with each #GQuark id and associated data element, together with the user_data parameter supplied to g_dataset_foreach().
user_data
the #GQuark id to identifying the data element.
the data element.
Specifies the type of function passed to g_dataset_foreach(). It is called with each #GQuark id and associated data element, together with the
user_dataparameter supplied to g_dataset_foreach().