final
Factor handbook » The language » Objects » Tuples » Tuple subclassing

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When not to use tuple subclassing

Vocabulary
syntax

Syntax

TUPLE: ... ; final

Word description
Declares the most recently defined word as a final tuple class which cannot be subclassed. Attempting to subclass a final class raises a bad-superclass error.

Definition

USING: classes.tuple words ;

IN: syntax

SYNTAX: final last-word make-final ;