box
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<box> ( -- box )

Vocabulary
boxes

Class description
A data type holding a single value in the value slot. The occupied slot indicates if the value is set.

Definition

IN: boxes

TUPLE: box value occupied ;

Methods

USING: boxes kernel refs ;

M: box delete-ref box> drop ;


USING: boxes refs ;

M: box get-ref box> ;


USING: boxes refs ;

M: box set-ref >box ;