+GLIB_AVAILABLE_IN_ALL
+GSequenceIter *g_sequence_lookup (GSequence *seq,
+ gpointer data,
+ GCompareDataFunc cmp_func,
+ gpointer cmp_data);
+GLIB_AVAILABLE_IN_ALL
+GSequenceIter *g_sequence_lookup_iter (GSequence *seq,
+ gpointer data,
+ GSequenceIterCompareFunc iter_cmp,
+ gpointer cmp_data);