util_diff_categories
Description:
[ Version ( since = "3.48" ) ]
public void util_diff_categories (Component? old_comp, Component? new_comp, out HashTable<unowned string,int> out_added, out HashTable<unowned string,int> out_removed)
Compares list of categories on the old_comp with the list of categories on the new_comp and fills out_added
categories and out_removed categories accordingly, as if the old_comp is replaced with the new_comp
.
When either of the components is null, it's considered as having no categories set. Rather than returning empty GenericSet, the return argument is set to null when there are no added/removed categories.
The key of the hash table is the category string, the value is an integer (1). There is used the hash table only for speed.
The returned GenericSet-s should be freed with g_hash_table_unref, when
no longer needed.
Parameters:
| old_comp |
an old Component, or null |
| new_comp |
a new Component, or null |
| out_added |
a GenericSet with added categories |
| out_removed |
a GenericSet with removed categories |