Implement chaining of interface methods.

[gob-dx.git] / doc / gob2.1.in

diff --git a/doc/gob2.1.in b/doc/gob2.1.in
index 9037aa2673b985c5b81023e6474644cca7a0017c..560dd8ae65ae0c762e782b4a0d6f7169a4a4367d 100644 (file)
--- a/doc/gob2.1.in
+++ b/doc/gob2.1.in
@@ -1065,6 +1065,21 @@ a specific method of the interface, just add \'interface <typename>\'
 before the method definition.  The method can, and probably should be,
 private.
 .PP
+Interface methods behave very similarly to virtual/override methods.
+As with override methods, you can use PARENT_HANDLER in the definition of an
+interface method to call the implementation of the same interface method in
+a parent class.
+.PP
+The NAME_parent_iface variable may be used to access the complete interface
+structure from a parent class, where NAME is the implemented interface (with
+colons replaced by underscores).
+This enables access to the full parent implementation of an interface.
+For example, if a class implements the Gtk:Tree:Model interface then the
+implementation of the same interface in the parent class is available via
+the Gtk_Tree_Model_parent_iface pointer.
+If an interface is not implemented in the parent class, then the corresponding
+parent_iface value will be a null pointer.
+.PP
 The following example implements a new object, that implements the
 Gtk:Tree:Model interface and implements the get_flags method of that
 interface.  Do note that except for standard (GTK+ and glib) specific