I just started learning GTK. I was going through source code of gtk+3.0.0, I found implementation of _get_type() methods for some gtk object types but some do not have an implementation of this method e.g GtkRange. Is there any reason for this? As far I understood from GObject Reference Manual, _get_type() method registers object type in type system.
gtk _get_type() function implementation
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the
get_type()function is needed for all types registered as a GType. GObject (the library) provides convenience macros to generate the correctget_type()function implementation taking into account things like thread-safe initialization, or dynamic type registration.the macro that is used for GObject (the type) subclasses is
G_DEFINE_TYPE(), but inside GTK+ you will also findG_DEFINE_TYPE_WITH_CODE(), used generally when the type also implements interfaces;G_DEFINE_ABSTRACT_TYPE()andG_DEFINE_ABSTRACT_TYPE_WITH_CODE(), used for abstract types; and, more recently,G_DEFINE_TYPE_WITH_PRIVATE()andG_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE(), which define GObject subclasses with private data, avoiding the call tog_type_class_add_private()inside the class initialization function.boxed types (GType wrappers around Plain Old Structures) also have
G_DEFINE_BOXED_TYPE(), and interface types haveG_DEFINE_INTERFACE().more information is available in the API reference for GObject:
https://docs.gtk.org/gobject/func.DEFINE_TYPE.html