Unit (morel 0.3.0 API)

java.lang.Object
- java.util.AbstractCollection<E>
- - java.util.AbstractList
  - - net.hydromatic.morel.eval.Unit

All Implemented Interfaces:

Comparable<Unit>, Iterable, Collection, List
```
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 Unit INSTANCE
  - Fields inherited from class java.util.AbstractList
    modCount
- Constructor Summary
  
  Constructors
  Modifier Constructor Description
  
  private Unit()
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  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, contains, containsAll, isEmpty, remove, removeAll, replaceAll, retainAll, sort, spliterator, toArray, toArray

- Field Detail
  - INSTANCE
```
public static final Unit INSTANCE
```
- Constructor Detail
  - Unit
```
private Unit()
```
- Method Detail
  - 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>