com.carrotsearch.hppc

Class DoubleDoubleScatterMap

java.lang.Object

com.carrotsearch.hppc.DoubleDoubleHashMap

com.carrotsearch.hppc.DoubleDoubleScatterMap

All Implemented Interfaces:

DoubleDoubleAssociativeContainer, DoubleDoubleMap, Preallocable, java.lang.Cloneable, java.lang.Iterable<DoubleDoubleCursor>

@Generated(date="2016-10-25T13:31:57+0200",
           value="KTypeVTypeScatterMap.java")
public class DoubleDoubleScatterMap
extends DoubleDoubleHashMap

Same as DoubleDoubleHashMap but does not implement per-instance key mixing strategy and uses a simpler (faster) bit distribution function.

Note: read about important differences between hash and scatter sets.

Nested Class Summary

Nested classes/interfaces inherited from class com.carrotsearch.hppc.DoubleDoubleHashMap

DoubleDoubleHashMap.KeysContainer

Field Summary

Fields inherited from class com.carrotsearch.hppc.DoubleDoubleHashMap

assigned, hasEmptyKey, keyMixer, keys, loadFactor, mask, orderMixer, resizeAt, values

Constructor Summary

Constructors

Constructor and Description
DoubleDoubleScatterMap() New instance with sane defaults.
DoubleDoubleScatterMap(int expectedElements) New instance with sane defaults.
DoubleDoubleScatterMap(int expectedElements, double loadFactor) New instance with sane defaults.

Method Summary

Modifier and Type	Method and Description
static DoubleDoubleScatterMap	from(double[] keys, double[] values) Creates a hash map from two index-aligned arrays of key-value pairs.
protected int	hashKey(double key) Returns a hash code for the given key.

Methods inherited from class com.carrotsearch.hppc.DoubleDoubleHashMap

addTo, allocateBuffers, allocateThenInsertThenRehash, clear, clone, containsKey, ensureCapacity, equalElements, equals, forEach, forEach, get, getOrDefault, hashCode, indexExists, indexGet, indexInsert, indexOf, indexReplace, isEmpty, iterator, keys, put, putAll, putAll, putIfAbsent, putOrAdd, rehash, release, remove, removeAll, removeAll, removeAll, shiftConflictingKeys, size, toString, values, verifyLoadFactor, visualizeKeyDistribution

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

DoubleDoubleScatterMap

public DoubleDoubleScatterMap()

New instance with sane defaults.

DoubleDoubleScatterMap

public DoubleDoubleScatterMap(int expectedElements)

New instance with sane defaults.

DoubleDoubleScatterMap

public DoubleDoubleScatterMap(int expectedElements,
                              double loadFactor)

New instance with sane defaults.

Method Detail

hashKey

protected int hashKey(double key)

Description copied from class: DoubleDoubleHashMap

Returns a hash code for the given key.

The default implementation mixes the hash of the key with DoubleDoubleHashMap.keyMixer to differentiate hash order of keys between hash containers. Helps alleviate problems resulting from linear conflict resolution in open addressing.

The output from this function should evenly distribute keys across the entire integer range.

Overrides:

hashKey in class DoubleDoubleHashMap

from

public static DoubleDoubleScatterMap from(double[] keys,
                                          double[] values)

Creates a hash map from two index-aligned arrays of key-value pairs.