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High Performance Primitive Collections Realtime (fork of HPPC from Carrotsearch) Fundamental data structures (maps, sets, lists, queues, heaps, sorts) generated for combinations of object and primitive types to conserve JVM memory and speed up execution. The Realtime fork intends to extend the existing collections, by tweaking to remove any dynamic allocations at runtime, and to obtain low variance execution times whatever the input nature.

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package com.carrotsearch.hppcrt.strategies;

import java.util.Comparator;

/**
 * Interface to support custom comparisons of doubles,
 * as replacement of either natural ordering or Comparable objects.
 */
 @javax.annotation.Generated(
    date = "2017-07-11T19:16:33+0200",
    value = "KTypeComparator.java") 
public interface DoubleComparator   
{
    /**
     * Defines the relative ordering of e1 and e2:
     * @return 0 if e1 is "equal" to e2, or else < 0 if e1 is "smaller" than e2, or else  > 0 if e1 is "bigger" than e2
     */
      
    int compare(double e1, double e2);
}