ROLE: - Factor Documentation

Vocabulary
roles

Syntax

ROLE: name slots... ; ROLE: name < role slots... ; ROLE: name <{ roles... } slots... ;

Word description
Defines a new role. tuple classes which inherit this role will contain the specified slots as well as the slots associated with the optional inherited roles.

Slot specifiers take one of the following three forms:

•	name - a slot which can hold any object, with no attributes
•	{ name attributes... } - a slot which can hold any object, with optional attributes
•	{ name class attributes... } - a slot specialized to a specific class, with optional attributes

Slot attributes are lists of slot attribute specifiers followed by values; a slot attribute specifier is one of initial: or read-only. See Tuple slot declarations for details.

See also
ROLE-TUPLE:

Definition

IN: roles

SYNTAX: ROLE: parse-role-definition define-role ;