Package net.hydromatic.morel.eval

Class Unit

java.lang.Object

java.util.AbstractCollection

java.util.AbstractList

net.hydromatic.morel.eval.Unit

All Implemented Interfaces:

Comparable<Unit>, Iterable, Collection, List, SequencedCollection

public class Unit
extends AbstractList
implements Comparable<Unit>

A placeholder value for the "unit" type.

We sometimes use it as a dummy value when we need to add a variable (and its type) to the compilation environment but we don't have a value (because it's not a runtime environment).

Field Summary

Fields

Modifier and Type	Field	Description
static final Unit	INSTANCE

Fields inherited from class java.util.AbstractList

modCount

Constructor Summary

Constructors

Modifier	Constructor	Description
private	Unit()

Method Summary

Modifier and Type	Method	Description
int	compareTo(Unit o)
Object	get(int index)
int	size()
String	toString()

Methods inherited from class java.util.AbstractList

add, add, addAll, clear, equals, hashCode, indexOf, iterator, lastIndexOf, listIterator, listIterator, remove, removeRange, set, subList

Methods inherited from class java.util.AbstractCollection

addAll, contains, containsAll, isEmpty, remove, removeAll, retainAll, toArray, toArray

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface java.util.List

addAll, addFirst, addLast, contains, containsAll, getFirst, getLast, isEmpty, remove, removeAll, removeFirst, removeLast, replaceAll, retainAll, reversed, sort, spliterator, toArray, toArray

Field Details

INSTANCE

public static final Unit INSTANCE

Constructor Details

Unit

private Unit()

Method Details

toString

public String toString()

Overrides:

toString in class AbstractCollection

get

public Object get(int index)

Specified by:

get in interface List

Specified by:

get in class AbstractList

size

public int size()

Specified by:

size in interface Collection

Specified by:

size in interface List

Specified by:

size in class AbstractCollection

compareTo

public int compareTo(Unit o)

Specified by:

compareTo in interface Comparable<Unit>