Destroys the dataset, freeing all memory allocated, and calling any destroy functions set for data elements.
Calls the given function for each data element which is associated with the given location. Note that this function is NOT thread-safe. So unless @dataset_location can be protected from any modifications during invocation of this function, it should not be called.
Gets the data element corresponding to a #GQuark.
Removes an element, without calling its destroy notification function.
Sets the data element associated with the given #GQuark id, and also the function to call when the data element is destroyed. Any previous data with the same key is removed, and its destroy function is called.