java.lang.Object
- it.unimi.dsi.fastutil.objects.AbstractReference2DoubleFunction<K>
- - it.unimi.dsi.fastutil.objects.Reference2DoubleFunctions.Singleton<K>
  - - it.unimi.dsi.fastutil.objects.Reference2DoubleMaps.Singleton<K>

All Implemented Interfaces:

Function<K,Double>, Reference2DoubleFunction<K>, Reference2DoubleMap<K>, Serializable, Cloneable, Function<K,Double>, ToDoubleFunction<K>, Map<K,Double>

Direct Known Subclasses:

Reference2DoubleSortedMaps.Singleton

Enclosing class:

Reference2DoubleMaps
```
public static class Reference2DoubleMaps.Singleton<K>
extends Reference2DoubleFunctions.Singleton<K>
implements Reference2DoubleMap<K>, Serializable, Cloneable
```
An immutable class representing a type-specific singleton 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.Reference2DoubleMap
  Reference2DoubleMap.Entry<K>, Reference2DoubleMap.FastEntrySet<K>

Method Summary

All Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method	Description
`boolean`	`containsValue(double 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.
`ObjectSet<Map.Entry<K,Double>>`	`entrySet()`	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 Double> m)`
`ObjectSet<Reference2DoubleMap.Entry<K>>`	`reference2DoubleEntrySet()`	Returns a type-specific set view of the mappings contained in this map.
`String`	`toString()`
`DoubleCollection`	`values()`

Methods inherited from class it.unimi.dsi.fastutil.objects.Reference2DoubleFunctions.Singleton
clone, containsKey, getDouble, size

Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractReference2DoubleFunction
defaultReturnValue, defaultReturnValue

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.Reference2DoubleFunction
andThenByte, andThenChar, andThenDouble, andThenFloat, andThenInt, andThenLong, andThenObject, andThenReference, andThenShort, applyAsDouble, composeByte, composeChar, composeDouble, composeFloat, composeInt, composeLong, composeObject, composeReference, composeShort, getDouble, put, removeDouble

Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2DoubleMap
clear, computeDouble, computeDoubleIfAbsent, computeDoubleIfAbsentPartial, computeDoubleIfPresent, containsKey, defaultReturnValue, defaultReturnValue, get, getOrDefault, getOrDefault, merge, mergeDouble, put, putIfAbsent, putIfAbsent, remove, remove, remove, replace, replace, replace, replace, size

- Method Detail
  - containsValue
```
public boolean containsValue(double v)
```
    Description copied from interface: Reference2DoubleMap
    
    Returns true if this map maps one or more keys to the specified value.
    
    Specified by:
    
    containsValue in interface Reference2DoubleMap<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,Double>
    
    Specified by:
    
    containsValue in interface Reference2DoubleMap<K>
  - putAll
```
public void putAll(Map<? extends K,? extends Double> m)
```
    Specified by:
    
    putAll in interface Map<K,Double>
  - reference2DoubleEntrySet
```
public ObjectSet<Reference2DoubleMap.Entry<K>> reference2DoubleEntrySet()
```
    Description copied from interface: Reference2DoubleMap
    
    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:
    
    reference2DoubleEntrySet in interface Reference2DoubleMap<K>
    
    Returns:
    
    a type-specific set view of the mappings contained in this map.
    
    See Also:
    
    Map.entrySet()
  - entrySet
```
@Deprecated
public ObjectSet<Map.Entry<K,Double>> entrySet()
```
    Deprecated.
    Please use the corresponding type-specific method instead.
    
    Returns a set view of the mappings contained in this map.
    Note that this specification strengthens the one given in Map.entrySet().
    
    Specified by:
    
    entrySet in interface Map<K,Double>
    
    Specified by:
    
    entrySet in interface Reference2DoubleMap<K>
    
    Returns:
    
    a set view of the mappings contained in this map.
    
    See Also:
    
    Map.entrySet()
  - keySet
```
public ReferenceSet<K> keySet()
```
    Description copied from interface: Reference2DoubleMap
    
    Note that this specification strengthens the one given in Map.keySet().
    
    Specified by:
    
    keySet in interface Map<K,Double>
    
    Specified by:
    
    keySet in interface Reference2DoubleMap<K>
    
    Returns:
    
    a set view of the keys contained in this map.
    
    See Also:
    
    Map.keySet()
  - values
```
public DoubleCollection values()
```
    Description copied from interface: Reference2DoubleMap
    
    Note that this specification strengthens the one given in Map.values().
    
    Specified by:
    
    values in interface Map<K,Double>
    
    Specified by:
    
    values in interface Reference2DoubleMap<K>
    
    Returns:
    
    a set view of the values contained in this map.
    
    See Also:
    
    Map.values()
  - isEmpty
```
public boolean isEmpty()
```
    Specified by:
    
    isEmpty in interface Map<K,Double>
  - hashCode
```
public int hashCode()
```
    Specified by:
    
    hashCode in interface Map<K,Double>
    
    Overrides:
    
    hashCode in class Object
  - equals
```
public boolean equals(Object o)
```
    Specified by:
    
    equals in interface Map<K,Double>
    
    Overrides:
    
    equals in class Object
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object

Class Reference2DoubleMaps.Singleton<K>

Nested Class Summary

Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.objects.Reference2DoubleMap

Method Summary

Methods inherited from class it.unimi.dsi.fastutil.objects.Reference2DoubleFunctions.Singleton

Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractReference2DoubleFunction

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.Reference2DoubleFunction

Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2DoubleMap

Method Detail

containsValue

containsValue

putAll

reference2DoubleEntrySet

entrySet

keySet

values

isEmpty

hashCode

equals

toString