[glib] Add macros and symbols for private data on dynamic types

[Matthias Clasen <matthiasc src gnome org>]

commit ca6b93d0936e6864d374d3e8f2a795c1702b28b3
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Fri Jul 26 16:45:48 2013 +0100

    Add macros and symbols for private data on dynamic types
    
    We need a TypeName_private_offset variable defined by the macros used to
    register dynamic types. We also need to call the adjust_private_offset()
    function inside class_init(). G_ADD_PRIVATE_DYNAMIC only sets the size
    of the private data structure, and relies on the behaviour of the
    g_type_class_adjuset_private_offset() function to register the private
    data structure at class init time if passed a value greater than zero.
    
    This allows using G_PRIVATE_OFFSET with dynamic types.

 gobject/gtypemodule.h |   15 ++++++++++++---
 1 files changed, 12 insertions(+), 3 deletions(-)
---
diff --git a/gobject/gtypemodule.h b/gobject/gtypemodule.h
index cc42bdd..22cbdaf 100644
--- a/gobject/gtypemodule.h
+++ b/gobject/gtypemodule.h
@@ -180,11 +180,16 @@ static void     type_name##_class_init        (TypeName##Class *klass); \
 static void     type_name##_class_finalize    (TypeName##Class *klass); \
 static gpointer type_name##_parent_class = NULL; \
 static GType    type_name##_type_id = 0; \
-static void     type_name##_class_intern_init (gpointer klass) \
+static gint     TypeName##_private_offset; \
+\
+_G_DEFINE_TYPE_EXTENDED_CLASS_INIT(TypeName, type_name) \
+\
+static inline gpointer \
+type_name##_get_instance_private (TypeName *self) \
 { \
-  type_name##_parent_class = g_type_class_peek_parent (klass); \
-  type_name##_class_init ((TypeName##Class*) klass); \
+  return (G_STRUCT_MEMBER_P (self, TypeName##_private_offset)); \
 } \
+\
 GType \
 type_name##_get_type (void) \
 { \
@@ -237,6 +242,10 @@ type_name##_register_type (GTypeModule *type_module) \
   g_type_module_add_interface (type_module, g_define_type_id, TYPE_IFACE, &g_implement_interface_info); \
 }
 
+#define G_ADD_PRIVATE_DYNAMIC(TypeName)         { \
+  TypeName##_private_offset = sizeof (TypeNamePrivate); \
+}
+
 GLIB_AVAILABLE_IN_ALL
 GType    g_type_module_get_type       (void) G_GNUC_CONST;
 GLIB_AVAILABLE_IN_ALL