+/* convenience macro to ease interface addition in the CODE
+ * section of EV_BACKEND_REGISTER_WITH_CODE (this macro relies on
+ * the g_define_type_id present within EV_BACKEND_REGISTER_WITH_CODE()).
+ * usage example:
+ * EV_BACKEND_REGISTER_WITH_CODE (PdfDocument, pdf_document,
+ * EV_BACKEND_IMPLEMENT_INTERFACE (EV_TYPE_DOCUMENT_THUMBNAILS,
+ * pdf_document_document_thumbnails_iface_init));
+ */
+#define EV_BACKEND_IMPLEMENT_INTERFACE(TYPE_IFACE, iface_init) { \
+ const GInterfaceInfo g_implement_interface_info = { \
+ (GInterfaceInitFunc) iface_init, NULL, NULL \
+ }; \
+ g_type_module_add_interface (module, \
+ g_define_type_id, \
+ TYPE_IFACE, \
+ &g_implement_interface_info); \
+}
+