[vala] Fix virtual methods returning structs

[Jürg Billeter <juergbi src gnome org>]

commit a82ad3fe728c41b9cd7c519963cdd1f21a65f2ca
Author: Jürg Billeter <j bitron ch>
Date:   Tue Sep 22 18:32:04 2009 +0200

    Fix virtual methods returning structs
    
    Fixes bug 595954.

 codegen/valagtypemodule.vala |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/codegen/valagtypemodule.vala b/codegen/valagtypemodule.vala
index 1eb3d74..2f3634d 100644
--- a/codegen/valagtypemodule.vala
+++ b/codegen/valagtypemodule.vala
@@ -327,13 +327,19 @@ internal class Vala.GTypeModule : GErrorModule {
 			return;
 		}
 
+		var creturn_type = m.return_type;
+		if (m.return_type.is_real_non_null_struct_type ()) {
+			// structs are returned via out parameter
+			creturn_type = new VoidType ();
+		}
+
 		// add vfunc field to the type struct
 		var vdeclarator = new CCodeFunctionDeclarator (m.vfunc_name);
 		var cparam_map = new HashMap<int,CCodeFormalParameter> (direct_hash, direct_equal);
 
 		generate_cparameters (m, decl_space, cparam_map, new CCodeFunction ("fake"), vdeclarator);
 
-		var vdecl = new CCodeDeclaration (m.return_type.get_cname ());
+		var vdecl = new CCodeDeclaration (creturn_type.get_cname ());
 		vdecl.add_declarator (vdeclarator);
 		type_struct.add_declaration (vdecl);
 	}