slot-spec
Factor handbook » The language » Objects » Low-level slot operations

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reader-word ( name -- word )

Vocabulary
slots

Class description
A slot specification. The "slots" word property of builtin-class and tuple-class instances holds sequences of slot specifications.

The slots of a slot specification are:

•	name - a string identifying the slot.
•	offset - an integer offset specifying where the slot value is stored inside instances of the relevant class. This is an implementation detail.
•	class - a class declaring the set of possible values for the slot.
•	initial - an initial value for the slot.
•	read-only - a boolean indicating whether the slot is read only or not. Read only slots do not have a writer method associated with them.

Definition

IN: slots

TUPLE: slot-spec name offset class initial read-only ;

Methods

USING: slots ;

M: slot-spec make-slot check-initial-value ;