+/**
+ * SyncFolderCallback:
+ *
+ * @self: a #ModestMailOperation
+ * @folder: the #TnyFolder to sync
+ * @user_data: generic data passed to user defined function.
+ *
+ * This is the callback of the sync_folder operation.
+ */
+typedef void (*SyncFolderCallback) (ModestMailOperation *self,
+ TnyFolder *folder,
+ gpointer user_data);
+
+