+typedef struct _GtkTreeSelectionPrivate GtkTreeSelectionPrivate;
+
+/**
+ * GtkTreeSelectionFunc:
+ * @selection: A #GtkTreeSelection
+ * @model: A #GtkTreeModel being viewed
+ * @path: The #GtkTreePath of the row in question
+ * @path_currently_selected: %TRUE, if the path is currently selected
+ * @data: (closure): user data
+ *
+ * A function used by gtk_tree_selection_set_select_function() to filter
+ * whether or not a row may be selected. It is called whenever a row's
+ * state might change. A return value of %TRUE indicates to @selection
+ * that it is okay to change the selection.
+ *
+ * Returns: %TRUE, if the selection state of the row can be toggled
+ */