[vala] Add factory method for creating instance register functions

[Jürg Billeter <juergbi src gnome org>]

commit 7171477e01f0a88866e501bf65c0e4ea8574e95e
Author: Didier 'Ptitjes <ptitjes free fr>
Date:   Thu Apr 30 15:32:49 2009 +0200

    Add factory method for creating instance register functions
    
    Signed-off-by: Didier 'Ptitjes <ptitjes free fr>

 codegen/valagtypemodule.vala |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/codegen/valagtypemodule.vala b/codegen/valagtypemodule.vala
index 18c44fd..e534cfe 100644
--- a/codegen/valagtypemodule.vala
+++ b/codegen/valagtypemodule.vala
@@ -1791,7 +1791,7 @@ internal class Vala.GTypeModule : GErrorModule {
 		}
 		decl_space.add_type_definition (type_struct);
 
-		var type_fun = new InterfaceRegisterFunction (iface, context);
+		var type_fun = create_interface_register_function (iface);
 		type_fun.init_from_type ();
 		decl_space.add_type_member_declaration (type_fun.get_declaration ());
 	}
@@ -1812,13 +1812,17 @@ internal class Vala.GTypeModule : GErrorModule {
 
 		add_interface_base_init_function (iface);
 
-		var type_fun = new InterfaceRegisterFunction (iface, context);
+		var type_fun = create_interface_register_function (iface);
 		type_fun.init_from_type ();
 		source_type_member_definition.append (type_fun.get_definition ());
 
 		current_type_symbol = null;
 	}
 
+	public virtual TypeRegisterFunction create_interface_register_function (Interface iface) {
+		return new InterfaceRegisterFunction (iface, context);
+	}
+
 	private void add_interface_base_init_function (Interface iface) {
 		var base_init = new CCodeFunction ("%s_base_init".printf (iface.get_lower_case_cname (null)), "void");
 		base_init.add_parameter (new CCodeFormalParameter ("iface", "%sIface *".printf (iface.get_cname ())));