+
+/**
+ * GtkTreeModelFilterModifyFunc:
+ * @model: the #GtkTreeModelFilter
+ * @iter: a #GtkTreeIter pointing to the row whose display values are determined
+ * @value: A #GValue which is already initialized for with the correct type for
+ * the column @column.
+ * @column: the column whose display value is determined
+ * @data: (closure): user data given to gtk_tree_model_filter_set_modify_func()
+ *
+ * A function which calculates display values from raw values in the model.
+ * It must fill @value with the display value for the column @column in the
+ * row indicated by @iter.
+ *
+ * Since this function is called for each data access, it's not a
+ * particularly efficient operation.
+ */
+