orc.runtime.values
Class NilValue

java.lang.Object
  orc.runtime.values.Value
      orc.runtime.values.ListValue
          orc.runtime.values.NilValue

All Implemented Interfaces:

java.lang.Iterable, Eq, ListLike

public class NilValue
extends ListValue

Field Summary

static NilValue

singleton

Fields inherited from class orc.runtime.values.Value

futureNotReady

Method Summary

<E> E	accept(Visitor<E> visitor)
java.util.List<java.lang.Object>	enlist()
boolean	eqTo(java.lang.Object that) Return true if this is equivalent to that.
int	hashCode()
java.lang.String	toString()
void	uncons(Token caller) Return the head and tail of a cons-like data structure to a token, or die.
void	unnil(Token caller) Signal a token if this value is equivalent to nil, or die.

Methods inherited from class orc.runtime.values.ListValue

iterator, make, make

Methods inherited from class orc.runtime.values.Value

forceArg, forceCall, signal

Methods inherited from class java.lang.Object

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

Field Detail

singleton

public static final NilValue singleton

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

uncons

public void uncons(Token caller)

Description copied from interface: ListLike

Return the head and tail of a cons-like data structure to a token, or die. The only place this should be called is TryCons

Specified by:

uncons in interface ListLike

Specified by:

uncons in class ListValue

unnil

public void unnil(Token caller)

Description copied from interface: ListLike

Signal a token if this value is equivalent to nil, or die. The only place this should be called is TryNil

Specified by:

unnil in interface ListLike

Specified by:

unnil in class ListValue

enlist

public java.util.List<java.lang.Object> enlist()

Specified by:

enlist in class ListValue

accept

public <E> E accept(Visitor<E> visitor)

Overrides:

accept in class ListValue

eqTo

public boolean eqTo(java.lang.Object that)

Description copied from interface: Eq

Return true if this is equivalent to that. that is assumed to be non-null. This is often implemented in terms of Equal.eq(Object, Object). Two "eq" objects should have the same hashCode at the time they are compared.

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object