gtk:bool-filter-expression (object)

object -- a gtk:bool-filter object
expression -- a gtk:expression instance

Accessor of the expression slot of the gtk:bool-filter class. The gtk:bool-filter-expression function gets the expression that the filter uses to evaluate if an item should be filtered. The (setf gtk:bool-filter-expression) function sets the expression. The expression must have a "gboolean" value type.