Int2IntFunctions.EmptyFunction (fastutil 7.0.13)

java.lang.Object
- it.unimi.dsi.fastutil.ints.AbstractInt2IntFunction
- - it.unimi.dsi.fastutil.ints.Int2IntFunctions.EmptyFunction

All Implemented Interfaces:

Function<java.lang.Integer,java.lang.Integer>, Int2IntFunction, java.io.Serializable, java.lang.Cloneable

Direct Known Subclasses:

Int2IntMaps.EmptyMap

Enclosing class:

Int2IntFunctions
```
public static class Int2IntFunctions.EmptyFunction
extends AbstractInt2IntFunction
implements java.io.Serializable, java.lang.Cloneable
```
An immutable class representing an empty type-specific function.
This class may be useful to implement your own in case you subclass a type-specific function.

See Also:

Serialized Form

Method Summary

All Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`void`	`clear()` Removes all associations from this function (optional operation).
`java.lang.Object`	`clone()`
`boolean`	`containsKey(int k)`
`int`	`defaultReturnValue()` Gets the default return value.
`void`	`defaultReturnValue(int defRetValue)` Sets the default return value.
`int`	`get(int k)` Returns the value to which the given key is mapped.
`java.lang.Integer`	`get(java.lang.Object k)` Deprecated. Please use the corresponding type-specific method instead.
`int`	`size()` Returns the intended number of keys in this function, or -1 if no such number exists.

Methods inherited from class it.unimi.dsi.fastutil.ints.AbstractInt2IntFunction
containsKey, put, put, remove, remove

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

- Method Detail
  - get
```
public int get(int k)
```
    Description copied from interface: Int2IntFunction
    
    Returns the value to which the given key is mapped.
    
    Specified by:
    
    get in interface Int2IntFunction
    
    Parameters:
    
    k - the key.
    
    Returns:
    
    the corresponding value, or the default return value if no value was present for the given key.
    
    See Also:
    
    Function.get(Object)
  - containsKey
```
public boolean containsKey(int k)
```
    Specified by:
    
    containsKey in interface Int2IntFunction
    
    See Also:
    
    Function.containsKey(Object)
  - defaultReturnValue
```
public int defaultReturnValue()
```
    Description copied from interface: Int2IntFunction
    
    Gets the default return value.
    
    Specified by:
    
    defaultReturnValue in interface Int2IntFunction
    
    Overrides:
    
    defaultReturnValue in class AbstractInt2IntFunction
    
    Returns:
    
    the current default return value.
  - defaultReturnValue
```
public void defaultReturnValue(int defRetValue)
```
    Description copied from interface: Int2IntFunction
    
    Sets the default return value. This value must be returned by type-specific versions of get(), put() and remove() to denote that the map does not contain the specified key. It must be 0/false/null by default.
    
    Specified by:
    
    defaultReturnValue in interface Int2IntFunction
    
    Overrides:
    
    defaultReturnValue in class AbstractInt2IntFunction
    
    Parameters:
    
    defRetValue - the new default return value.
    
    See Also:
    
    Int2IntFunction.defaultReturnValue()
  - get
```
@Deprecated
public java.lang.Integer get(java.lang.Object k)
```
    Deprecated. Please use the corresponding type-specific method instead.
    
    Delegates to the corresponding type-specific method, taking care of returning null on a missing key.
    This method must check whether the provided key is in the map using containsKey(). Thus, it probes the map twice. Implementors of subclasses should override it with a more efficient method.
    
    Specified by:
    
    get in interface Function<java.lang.Integer,java.lang.Integer>
    
    Overrides:
    
    get in class AbstractInt2IntFunction
    
    Parameters:
    
    k - the key.
    
    Returns:
    
    the corresponding value, or null if no value was present for the given key.
    
    See Also:
    
    Map.get(Object)
  - size
```
public int size()
```
    Description copied from interface: Function
    
    Returns the intended number of keys in this function, or -1 if no such number exists.
    Most function implementations will have some knowledge of the intended number of keys in their domain. In some cases, however, this might not be possible.
    
    Specified by:
    
    size in interface Function<java.lang.Integer,java.lang.Integer>
    
    Returns:
    
    the intended number of keys in this function, or -1 if that number is not available.
  - clear
```
public void clear()
```
    Description copied from interface: Function
    
    Removes all associations from this function (optional operation).
    
    Specified by:
    
    clear in interface Function<java.lang.Integer,java.lang.Integer>
    
    Overrides:
    
    clear in class AbstractInt2IntFunction
    
    See Also:
    
    Map.clear()
  - clone
```
public java.lang.Object clone()
```
    Overrides:
    
    clone in class java.lang.Object

Class Int2IntFunctions.EmptyFunction

Method Summary

Methods inherited from class it.unimi.dsi.fastutil.ints.AbstractInt2IntFunction

Methods inherited from class java.lang.Object

Method Detail

get

containsKey

defaultReturnValue

defaultReturnValue

get

size

clear

clone