All Superinterfaces:

java.util.function.DoubleUnaryOperator, Function<java.lang.Double,java.lang.Float>, java.util.function.Function<java.lang.Double,java.lang.Float>

All Known Subinterfaces:

Double2FloatMap, Double2FloatSortedMap

All Known Implementing Classes:

AbstractDouble2FloatFunction, AbstractDouble2FloatMap, AbstractDouble2FloatSortedMap, Double2FloatArrayMap, Double2FloatAVLTreeMap, Double2FloatFunctions.EmptyFunction, Double2FloatFunctions.PrimitiveFunction, Double2FloatFunctions.Singleton, Double2FloatFunctions.SynchronizedFunction, Double2FloatFunctions.UnmodifiableFunction, Double2FloatLinkedOpenHashMap, Double2FloatMaps.EmptyMap, Double2FloatMaps.Singleton, Double2FloatMaps.SynchronizedMap, Double2FloatMaps.UnmodifiableMap, Double2FloatOpenCustomHashMap, Double2FloatOpenHashMap, Double2FloatRBTreeMap, Double2FloatSortedMaps.EmptySortedMap, Double2FloatSortedMaps.Singleton, Double2FloatSortedMaps.SynchronizedSortedMap, Double2FloatSortedMaps.UnmodifiableSortedMap

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface Double2FloatFunction
extends Function<java.lang.Double,java.lang.Float>, java.util.function.DoubleUnaryOperator
```
A type-specific Function; provides some additional methods that use polymorphism to avoid (un)boxing.
Type-specific versions of get(), put() and remove() cannot rely on null to denote absence of a key. Rather, they return a default return value, which is set to 0/false at creation, but can be changed using the defaultReturnValue() method.
For uniformity reasons, even functions returning objects implement the default return value (of course, in this case the default return value is initialized to null).
The default implementation of optional operations just throw an UnsupportedOperationException, except for the type-specific containsKey(), which return true. Generic versions of accessors delegate to the corresponding type-specific counterparts following the interface rules.
Warning: to fall in line as much as possible with the standard map interface, it is required that standard versions of get(), put() and remove() for maps with primitive-type keys or values return null to denote missing keys rather than wrap the default return value in an object. In case both keys and values are reference types, the default return value must be returned instead, thus violating the standard map interface when the default return value is not null.

See Also:

Function

Method Summary

All Methods Instance Methods Abstract Methods Default Methods Deprecated Methods
Modifier and Type	Method	Description
`default <T> java.util.function.Function<java.lang.Double,T>`	`andThen(java.util.function.Function<? super java.lang.Float,? extends T> after)`	Deprecated. Please use the corresponding type-specific method instead.
`default Double2ByteFunction`	`andThenByte(Float2ByteFunction after)`
`default Double2CharFunction`	`andThenChar(Float2CharFunction after)`
`default Double2DoubleFunction`	`andThenDouble(Float2DoubleFunction after)`
`default Double2FloatFunction`	`andThenFloat(Float2FloatFunction after)`
`default Double2IntFunction`	`andThenInt(Float2IntFunction after)`
`default Double2LongFunction`	`andThenLong(Float2LongFunction after)`
`default <T> Double2ObjectFunction<T>`	`andThenObject(Float2ObjectFunction<? extends T> after)`
`default <T> Double2ReferenceFunction<T>`	`andThenReference(Float2ReferenceFunction<? extends T> after)`
`default Double2ShortFunction`	`andThenShort(Float2ShortFunction after)`
`default double`	`applyAsDouble(double operand)`
`default <T> java.util.function.Function<T,java.lang.Float>`	`compose(java.util.function.Function<? super T,? extends java.lang.Double> before)`	Deprecated. Please use the corresponding type-specific method instead.
`default Byte2FloatFunction`	`composeByte(Byte2DoubleFunction before)`
`default Char2FloatFunction`	`composeChar(Char2DoubleFunction before)`
`default Double2FloatFunction`	`composeDouble(Double2DoubleFunction before)`
`default Float2FloatFunction`	`composeFloat(Float2DoubleFunction before)`
`default Int2FloatFunction`	`composeInt(Int2DoubleFunction before)`
`default Long2FloatFunction`	`composeLong(Long2DoubleFunction before)`
`default <T> Object2FloatFunction<T>`	`composeObject(Object2DoubleFunction<? super T> before)`
`default <T> Reference2FloatFunction<T>`	`composeReference(Reference2DoubleFunction<? super T> before)`
`default Short2FloatFunction`	`composeShort(Short2DoubleFunction before)`
`default boolean`	`containsKey(double key)`	Returns true if this function contains a mapping for the specified key.
`default boolean`	`containsKey(java.lang.Object key)`	Deprecated. Please use the corresponding type-specific method instead.
`default float`	`defaultReturnValue()`	Gets the default return value.
`default void`	`defaultReturnValue(float rv)`	Sets the default return value (optional operation).
`float`	`get(double key)`	Returns the value to which the given key is mapped.
`default java.lang.Float`	`get(java.lang.Object key)`	Deprecated. Please use the corresponding type-specific method instead.
`default float`	`getOrDefault(double key, float defaultValue)`	Returns the value associated by this function to the specified key, or give the specified value if not present.
`default java.lang.Float`	`getOrDefault(java.lang.Object key, java.lang.Float defaultValue)`	Deprecated. Please use the corresponding type-specific method instead.
`default float`	`put(double key, float value)`	Adds a pair to the map (optional operation).
`default java.lang.Float`	`put(java.lang.Double key, java.lang.Float value)`	Deprecated. Please use the corresponding type-specific method instead.
`default float`	`remove(double key)`	Removes the mapping with the given key (optional operation).
`default java.lang.Float`	`remove(java.lang.Object key)`	Deprecated. Please use the corresponding type-specific method instead.

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

Methods inherited from interface it.unimi.dsi.fastutil.Function
apply, clear, size

- Method Detail
  - applyAsDouble
```
default double applyAsDouble(double operand)
```
    Specified by:
    
    applyAsDouble in interface java.util.function.DoubleUnaryOperator
    
    Since:
    
    8.0.0
  - put
```
default float put(double key,
                  float value)
```
    Adds a pair to the map (optional operation).
    
    Parameters:
    
    key - the key.
    
    value - the value.
    
    Returns:
    
    the old value, or the default return value if no value was present for the given key.
    
    See Also:
    
    Function.put(Object,Object)
  - get
```
float get(double key)
```
    Returns the value to which the given key is mapped.
    
    Parameters:
    
    key - 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)
  - getOrDefault
```
default float getOrDefault(double key,
                           float defaultValue)
```
    Returns the value associated by this function to the specified key, or give the specified value if not present.
    
    Parameters:
    
    key - the key.
    
    defaultValue - the value to return if not present.
    
    Returns:
    
    the corresponding value, or defaultValue if no value was present for the given key.
    
    Since:
    
    8.5.0
    
    See Also:
    
    Function.getOrDefault(Object, Object)
  - remove
```
default float remove(double key)
```
    Removes the mapping with the given key (optional operation).
    
    Parameters:
    
    key - the key.
    
    Returns:
    
    the old value, or the default return value if no value was present for the given key.
    
    See Also:
    
    Function.remove(Object)
  - put
```
@Deprecated
default java.lang.Float put(java.lang.Double key,
                            java.lang.Float value)
```
    Deprecated.
    Please use the corresponding type-specific method instead.
    
    Associates the specified value with the specified key in this function (optional operation).
    
    Specified by:
    
    put in interface Function<java.lang.Double,java.lang.Float>
    
    Parameters:
    
    key - the key.
    
    value - the value.
    
    Returns:
    
    the old value, or null if no value was present for the given key.
    
    See Also:
    
    Map.put(Object,Object)
  - get
```
@Deprecated
default java.lang.Float get(java.lang.Object key)
```
    Deprecated.
    Please use the corresponding type-specific method instead.
    
    Returns the value associated by this function to the specified key.
    
    Specified by:
    
    get in interface Function<java.lang.Double,java.lang.Float>
    
    Parameters:
    
    key - the key.
    
    Returns:
    
    the corresponding value, or null if no value was present for the given key.
    
    See Also:
    
    Map.get(Object)
  - getOrDefault
```
@Deprecated
default java.lang.Float getOrDefault(java.lang.Object key,
                                     java.lang.Float defaultValue)
```
    Deprecated.
    Please use the corresponding type-specific method instead.
    
    Returns the value associated by this function to the specified key, or give the specified value if not present.
    
    Specified by:
    
    getOrDefault in interface Function<java.lang.Double,java.lang.Float>
    
    Parameters:
    
    key - the key.
    
    defaultValue - the default value to return if not present.
    
    Returns:
    
    the corresponding value, or defaultValue if no value was present for the given key.
    
    See Also:
    
    Map.getOrDefault(Object, Object)
  - remove
```
@Deprecated
default java.lang.Float remove(java.lang.Object key)
```
    Deprecated.
    Please use the corresponding type-specific method instead.
    
    Removes this key and the associated value from this function if it is present (optional operation).
    
    Specified by:
    
    remove in interface Function<java.lang.Double,java.lang.Float>
    
    Parameters:
    
    key - the key.
    
    Returns:
    
    the old value, or null if no value was present for the given key.
    
    See Also:
    
    Map.remove(Object)
  - containsKey
```
default boolean containsKey(double key)
```
    Returns true if this function contains a mapping for the specified key.
    Note that for some kind of functions (e.g., hashes) this method will always return true. In particular, this default implementation always returns true.
    
    Parameters:
    
    key - the key.
    
    Returns:
    
    true if this function associates a value to key.
    
    See Also:
    
    Function.containsKey(Object)
  - containsKey
```
@Deprecated
default boolean containsKey(java.lang.Object key)
```
    Deprecated.
    Please use the corresponding type-specific method instead.
    
    Returns true if this function contains a mapping for the specified key.
    Note that for some kind of functions (e.g., hashes) this method will always return true. This default implementation, in particular, always return true.
    
    Specified by:
    
    containsKey in interface Function<java.lang.Double,java.lang.Float>
    
    Parameters:
    
    key - the key.
    
    Returns:
    
    true if this function associates a value to key.
    
    See Also:
    
    Map.containsKey(Object)
  - defaultReturnValue
```
default void defaultReturnValue(float rv)
```
    Sets the default return value (optional operation). 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.
    
    Parameters:
    
    rv - the new default return value.
    
    See Also:
    
    defaultReturnValue()
  - defaultReturnValue
```
default float defaultReturnValue()
```
    Gets the default return value.
    This default implementation just return the default null value of the type (null for objects, 0 for scalars, false for Booleans).
    
    Returns:
    
    the current default return value.
  - compose
```
@Deprecated
default <T> java.util.function.Function<T,java.lang.Float> compose(java.util.function.Function<? super T,? extends java.lang.Double> before)
```
    Deprecated.
    Please use the corresponding type-specific method instead.
    
    Specified by:
    
    compose in interface java.util.function.Function<java.lang.Double,java.lang.Float>
  - andThen
```
@Deprecated
default <T> java.util.function.Function<java.lang.Double,T> andThen(java.util.function.Function<? super java.lang.Float,? extends T> after)
```
    Deprecated.
    Please use the corresponding type-specific method instead.
    
    Specified by:
    
    andThen in interface java.util.function.Function<java.lang.Double,java.lang.Float>
  - andThenByte
```
default Double2ByteFunction andThenByte(Float2ByteFunction after)
```
  - composeByte
```
default Byte2FloatFunction composeByte(Byte2DoubleFunction before)
```
  - andThenShort
```
default Double2ShortFunction andThenShort(Float2ShortFunction after)
```
  - composeShort
```
default Short2FloatFunction composeShort(Short2DoubleFunction before)
```
  - andThenInt
```
default Double2IntFunction andThenInt(Float2IntFunction after)
```
  - composeInt
```
default Int2FloatFunction composeInt(Int2DoubleFunction before)
```
  - andThenLong
```
default Double2LongFunction andThenLong(Float2LongFunction after)
```
  - composeLong
```
default Long2FloatFunction composeLong(Long2DoubleFunction before)
```
  - andThenChar
```
default Double2CharFunction andThenChar(Float2CharFunction after)
```
  - composeChar
```
default Char2FloatFunction composeChar(Char2DoubleFunction before)
```
  - andThenFloat
```
default Double2FloatFunction andThenFloat(Float2FloatFunction after)
```
  - composeFloat
```
default Float2FloatFunction composeFloat(Float2DoubleFunction before)
```
  - andThenDouble
```
default Double2DoubleFunction andThenDouble(Float2DoubleFunction after)
```
  - composeDouble
```
default Double2FloatFunction composeDouble(Double2DoubleFunction before)
```
  - andThenObject
```
default <T> Double2ObjectFunction<T> andThenObject(Float2ObjectFunction<? extends T> after)
```
  - composeObject
```
default <T> Object2FloatFunction<T> composeObject(Object2DoubleFunction<? super T> before)
```
  - andThenReference
```
default <T> Double2ReferenceFunction<T> andThenReference(Float2ReferenceFunction<? extends T> after)
```
  - composeReference
```
default <T> Reference2FloatFunction<T> composeReference(Reference2DoubleFunction<? super T> before)
```

Interface Double2FloatFunction

Method Summary

Methods inherited from interface java.util.function.DoubleUnaryOperator

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

Method Detail

applyAsDouble

put

get

getOrDefault

remove

put

get

getOrDefault

remove

containsKey

containsKey

defaultReturnValue

defaultReturnValue

compose

andThen

andThenByte

composeByte

andThenShort

composeShort

andThenInt

composeInt

andThenLong

composeLong

andThenChar

composeChar

andThenFloat

composeFloat

andThenDouble

composeDouble

andThenObject

composeObject

andThenReference

composeReference