extends_object/2-3

Description

extends_object(Prototype, Parent)
extends_object(Prototype, Parent, Scope)

Enumerates, by backtracking, all pairs of objects such that the first one extends the second. The relation scope is represented by the atoms public, protected, and private.

Modes and number of proofs

extends_object(?object_identifier, ?object_identifier) - zero_or_more
extends_object(?object_identifier, ?object_identifier, ?scope) - zero_or_more

Errors

Prototype is neither a variable nor a valid object identifier:
type_error(object_identifier, Prototype)
Parent is neither a variable nor a valid object identifier:
type_error(object_identifier, Parent)
Scope is neither a variable nor an atom:
type_error(atom, Scope)
Scope is an atom but an invalid entity scope:
domain_error(scope, Scope)

Examples

% enumerate objects derived from the state_space prototype:
| ?- extends_object(Object, state_space).

% enumerate objects publicly derived from the list prototype:
| ?- extends_object(Object, list, public).