empty-union? ( object -- ? )

Vocabulary

classes.algebra.private

Inputs and outputs

object	an object
?	a boolean

Word description

Tests if the object is an instance of the empty-union class.

Definition

USING: accessors kernel sequences ;

IN: classes.algebra.private

: empty-union? ( object -- ? )
    dup anonymous-union? [ members>> empty? ] [ drop f ] if ;