CountCategories
if (CountCategories() != other.CountCategories())
for (int32 i = CountCategories() - 1; i >= 0; i--) {
for (int32 i = value->CountCategories() - 1; i >= 0; i--)
for (int32 i = CountCategories() - 1; i >= 0; i--) {
int32 CountCategories() const;