Suppose I made a mistake (I actually did!) and had my element instance size exceed 16 bit. I used GST_BOILERPLATE_FULL() to declare it.
GST_BOILERPLATE_FULL() calls gst_type_register_static_full() to register new type with glib.

For some reason that I don't understand gst_type_register_static_full() declares instance_size parameter as guint and then internally casts it into guint16 probably suppressing corresponding warning(s). Why?

If it were to declare instance_size as guint16, the compiler would (hopefully) throw a warning if sizeof(type) exceeded 16 bit. That would caught an unsuspecting dev right there on the spot.

I filed a bug against glib to see if they could add an assert or something if the type size exceeds 16 bit. See https://bugzilla.gnome.org/show_bug.cgi?id=659916.
However in this case they obviously can't do anything as the cast to guint16 has been done already by gst_type_register_static_full().

I suggest changing instance_size parameter of gst_type_register_static_full() to guint16. If that is not possible for compatibility or some other reason, consider adding an assert to gst_type_register_static_full() to ensure that passed instance_size is within the range.

Regards,
-- Max Paklin.