I've found gtktypeutils.h define GTK_CHECK_CAST with comment of
/* glib macro wrappers (compatibility) */.
is that meaning I'd better not to use SOME_CHECK_CAST, but to use directly
G_TYPE_CHECK_INSTANCE_CAST?
for example, GStreamer do not use GST_CHECK_CAST, refer directly to G_TYPE_...
"""
#define GST_OBJECT_CAST(obj) ((GstObject*)(obj))
#define GST_OBJECT_CLASS_CAST(klass) ((GstObjectClass*)(klass))
#ifdef GST_TYPE_PARANOID
# define GST_OBJECT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj),
GST_TYPE_OBJECT, GstObject))
# define GST_OBJECT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass),
GST_TYPE_OBJECT, GstObjectClass))
#else
# define GST_OBJECT GST_OBJECT_CAST
# define GST_OBJECT_CLASS GST_OBJECT_CLASS_CAST
#endif
"""
that form of definition is new GTK+-2.x stlye?
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