java.lang.Object
- it.unimi.dsi.fastutil.objects.AbstractReference2IntFunction<K>
- - it.unimi.dsi.fastutil.objects.Reference2IntFunctions.EmptyFunction<K>
  - - it.unimi.dsi.fastutil.objects.Reference2IntMaps.EmptyMap<K>

All Implemented Interfaces:

Function<K,Integer>, Reference2IntFunction<K>, Reference2IntMap<K>, Serializable, Cloneable, Function<K,Integer>, ToIntFunction<K>, Map<K,Integer>

Direct Known Subclasses:

Reference2IntSortedMaps.EmptySortedMap

Enclosing class:

Reference2IntMaps
```
public static class Reference2IntMaps.EmptyMap<K>
extends Reference2IntFunctions.EmptyFunction<K>
implements Reference2IntMap<K>, Serializable, Cloneable
```
An immutable class representing an empty type-specific map.
This class may be useful to implement your own in case you subclass a type-specific map.

See Also:

Serialized Form

Nested Class Summary
- Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.objects.Reference2IntMap
  Reference2IntMap.Entry<K>, Reference2IntMap.FastEntrySet<K>

Method Summary

All Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method	Description
`Object`	`clone()`
`boolean`	`containsValue(int v)`	Returns `true` if this map maps one or more keys to the specified value.
`boolean`	`containsValue(Object ov)`	Deprecated. Please use the corresponding type-specific method instead.
`boolean`	`equals(Object o)`
`int`	`hashCode()`
`boolean`	`isEmpty()`
`ReferenceSet<K>`	`keySet()`
`void`	`putAll(Map<? extends K,? extends Integer> m)`
`ObjectSet<Reference2IntMap.Entry<K>>`	`reference2IntEntrySet()`	Returns a type-specific set view of the mappings contained in this map.
`String`	`toString()`
`IntCollection`	`values()`

Methods inherited from class it.unimi.dsi.fastutil.objects.Reference2IntFunctions.EmptyFunction
clear, containsKey, defaultReturnValue, defaultReturnValue, getInt, size

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface it.unimi.dsi.fastutil.Function
apply

Methods inherited from interface java.util.function.Function
andThen, compose

Methods inherited from interface java.util.Map
compute, computeIfAbsent, computeIfPresent, forEach, replaceAll

Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2IntFunction
andThenByte, andThenChar, andThenDouble, andThenFloat, andThenInt, andThenLong, andThenObject, andThenReference, andThenShort, applyAsInt, composeByte, composeChar, composeDouble, composeFloat, composeInt, composeLong, composeObject, composeReference, composeShort, getInt, put, removeInt

Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2IntMap
clear, computeInt, computeIntIfAbsent, computeIntIfAbsentPartial, computeIntIfPresent, containsKey, defaultReturnValue, defaultReturnValue, entrySet, get, getOrDefault, getOrDefault, merge, mergeInt, put, putIfAbsent, putIfAbsent, remove, remove, remove, replace, replace, replace, replace, size

- Method Detail
  - containsValue
```
public boolean containsValue(int v)
```
    Description copied from interface: Reference2IntMap
    
    Returns true if this map maps one or more keys to the specified value.
    
    Specified by:
    
    containsValue in interface Reference2IntMap<K>
    
    See Also:
    
    Map.containsValue(Object)
  - containsValue
```
@Deprecated
public boolean containsValue(Object ov)
```
    Deprecated.
    Please use the corresponding type-specific method instead.
    
    Specified by:
    
    containsValue in interface Map<K,Integer>
    
    Specified by:
    
    containsValue in interface Reference2IntMap<K>
  - putAll
```
public void putAll(Map<? extends K,? extends Integer> m)
```
    Specified by:
    
    putAll in interface Map<K,Integer>
  - reference2IntEntrySet
```
public ObjectSet<Reference2IntMap.Entry<K>> reference2IntEntrySet()
```
    Description copied from interface: Reference2IntMap
    
    Returns a type-specific set view of the mappings contained in this map.
    This method is necessary because there is no inheritance along type parameters: it is thus impossible to strengthen Map.entrySet() so that it returns an ObjectSet of type-specific entries (the latter makes it possible to access keys and values with type-specific methods).
    
    Specified by:
    
    reference2IntEntrySet in interface Reference2IntMap<K>
    
    Returns:
    
    a type-specific set view of the mappings contained in this map.
    
    See Also:
    
    Map.entrySet()
  - keySet
```
public ReferenceSet<K> keySet()
```
    Description copied from interface: Reference2IntMap
    
    Note that this specification strengthens the one given in Map.keySet().
    
    Specified by:
    
    keySet in interface Map<K,Integer>
    
    Specified by:
    
    keySet in interface Reference2IntMap<K>
    
    Returns:
    
    a set view of the keys contained in this map.
    
    See Also:
    
    Map.keySet()
  - values
```
public IntCollection values()
```
    Description copied from interface: Reference2IntMap
    
    Note that this specification strengthens the one given in Map.values().
    
    Specified by:
    
    values in interface Map<K,Integer>
    
    Specified by:
    
    values in interface Reference2IntMap<K>
    
    Returns:
    
    a set view of the values contained in this map.
    
    See Also:
    
    Map.values()
  - clone
```
public Object clone()
```
    Overrides:
    
    clone in class Reference2IntFunctions.EmptyFunction<K>
  - isEmpty
```
public boolean isEmpty()
```
    Specified by:
    
    isEmpty in interface Map<K,Integer>
  - hashCode
```
public int hashCode()
```
    Specified by:
    
    hashCode in interface Map<K,Integer>
    
    Overrides:
    
    hashCode in class Reference2IntFunctions.EmptyFunction<K>
  - equals
```
public boolean equals(Object o)
```
    Specified by:
    
    equals in interface Map<K,Integer>
    
    Overrides:
    
    equals in class Reference2IntFunctions.EmptyFunction<K>
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Reference2IntFunctions.EmptyFunction<K>

Class Reference2IntMaps.EmptyMap<K>

Nested Class Summary

Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.objects.Reference2IntMap

Method Summary

Methods inherited from class it.unimi.dsi.fastutil.objects.Reference2IntFunctions.EmptyFunction

Methods inherited from class java.lang.Object

Methods inherited from interface it.unimi.dsi.fastutil.Function

Methods inherited from interface java.util.function.Function

Methods inherited from interface java.util.Map

Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2IntFunction

Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2IntMap

Method Detail

containsValue

containsValue

putAll

reference2IntEntrySet

keySet

values

clone

isEmpty

hashCode

equals

toString