Class Dif

java.lang.Object

org.projog.core.predicate.AbstractSingleResultPredicate

org.projog.core.predicate.builtin.reif.Dif

All Implemented Interfaces:

KnowledgeBaseConsumer, PredicateFactory

public final class Dif
extends AbstractSingleResultPredicate

dif(X,Y) - enforces restriction that the two given terms are never equal.

If X and Y cannot unify then the goal succeeds. If X and Y are equal then the goal fails. If X and Y could unify then a restriction is added to prevent X and Y from unifying in the future.

Constructor Summary

Constructors

Constructor	Description
Dif()

Method Summary

Modifier and Type	Method	Description
boolean	evaluate(Term arg1, Term arg2)

Methods inherited from class AbstractSingleResultPredicate

evaluate, evaluate, evaluate, evaluate, getArithmeticOperators, getFileHandles, getKnowledgeBase, getOperands, getPredicate, getPredicates, getProjogListeners, getSpyPoints, getTermFormatter, init, isRetryable, setKnowledgeBase

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface PredicateFactory

isAlwaysCutOnBacktrack, preprocess

Constructor Details

Dif

public Dif()

Method Details

evaluate

public boolean evaluate(Term arg1,
 Term arg2)

Overrides:

evaluate in class AbstractSingleResultPredicate