it.unimi.dsi.fastutil.objects

Class AbstractReference2DoubleFunction<K>

java.lang.Object

it.unimi.dsi.fastutil.objects.AbstractReference2DoubleFunction<K>

All Implemented Interfaces:

Reference2DoubleFunction<K>, java.io.Serializable, java.util.function.Function<K,java.lang.Double>, java.util.function.ToDoubleFunction<K>

Direct Known Subclasses:

AbstractReference2DoubleMap, Reference2DoubleFunctions.EmptyFunction, Reference2DoubleFunctions.Singleton, Reference2DoubleFunctions.UnmodifiableFunction

public abstract class AbstractReference2DoubleFunction<K>
extends java.lang.Object
implements Reference2DoubleFunction<K>, java.io.Serializable

An abstract class providing basic methods for functions implementing a type-specific interface.

This class handles directly a default return value (including methods to access it). Instances of classes inheriting from this class have just to return defRetValue to denote lack of a key in type-specific methods. The value is serialized.

Implementing subclasses have just to provide type-specific get(), type-specific containsKey(), and size() methods.

See Also:

Serialized Form

Method Summary

Modifier and Type	Method and Description
double	defaultReturnValue() Gets the default return value.
void	defaultReturnValue(double rv) Sets the default return value (optional operation).

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2DoubleFunction

applyAsDouble, get, getDouble, put, put, remove, removeDouble

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

apply, clear, containsKey, size

Methods inherited from interface java.util.function.Function

andThen, compose, identity

Method Detail

defaultReturnValue

public void defaultReturnValue(double rv)

Description copied from interface: Reference2DoubleFunction

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.

Specified by:

defaultReturnValue in interface Reference2DoubleFunction<K>

Parameters:

rv - the new default return value.

See Also:

Reference2DoubleFunction.defaultReturnValue()

defaultReturnValue

public double defaultReturnValue()

Description copied from interface: Reference2DoubleFunction

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).

Specified by:

defaultReturnValue in interface Reference2DoubleFunction<K>

Returns:

the current default return value.