Equal

java.lang.Object
- org.projog.core.predicate.AbstractSingleResultPredicate
- - org.projog.core.predicate.builtin.compare.Equal

All Implemented Interfaces:

KnowledgeBaseConsumer, PredicateFactory
```
public final class Equal
extends AbstractSingleResultPredicate
```
X=Y - an equality test.
If X can be matched with Y the goal succeeds else the goal fails. A X=Y goal will consider an uninstantiated variable to be equal to anything. A X=Y goal will always succeed if either argument is uninstantiated.

- Constructor Summary
  
  Constructors
  Constructor Description
  
  Equal()
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  protected boolean evaluate(Term arg1, Term arg2)
  - Methods inherited from class org.projog.core.predicate.AbstractSingleResultPredicate
    evaluate, evaluate, evaluate, evaluate, evaluate, getArithmeticOperators, getFileHandles, getKnowledgeBase, getOperands, getPredicate, getPredicates, getProjogListeners, getSpyPoints, getTermFormatter, init, isRetryable, setKnowledgeBase
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
  - Methods inherited from interface org.projog.core.predicate.PredicateFactory
    isAlwaysCutOnBacktrack

Constructor Detail
- Equal
```
public Equal()
```

Method Detail

evaluate

protected boolean evaluate(Term arg1,
                           Term arg2)

Overrides:: evaluate in class AbstractSingleResultPredicate