+/**
+ * GtkCellLayoutDataFunc:
+ * @cell_layout: a #GtkCellLayout
+ * @cell: the cell renderer whose value is to be set
+ * @tree_model: the model
+ * @iter: a #GtkTreeIter indicating the row to set the value for
+ * @data: user data passed to gtk_cell_layout_set_cell_data_func()
+ *
+ * A function which should set the value of @cell_layout's cell renderer(s)
+ * as appropriate.
+ */