data for the new item
the GSequenceIterCompare function used to compare iterators in the sequence. It is called with two iterators pointing into seq. It should return 0 if the iterators are equal, a negative value if the first iterator comes before the second, and a positive value if the second iterator comes before the first.
user data passed to iter_cmp
a GSequenceIter pointing to the position in seq where data would have been inserted according to iter_cmp and cmp_data.
Like g_sequence_search(), but uses a GSequenceIterCompareFunc instead of a GCompareDataFunc as the compare function. If you are simply searching for an existing element of the sequence, consider using g_sequence_lookup_iter(). Since 2.14