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High Performance Primitive Collections: data structures (maps, sets, lists, stacks, queues) generated for combinations of object and primitive types to conserve JVM memory and speed up execution.

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package com.carrotsearch.hppc;

/**
 * Anything that can preallocate buffers given prior knowledge of the number of
 * stored elements.
 */
public interface Preallocable {
  /**
   * Ensure this container can hold at least the given number of elements
   * without resizing its buffers.
   * 
   * @param expectedElements
   *          The total number of elements, inclusive.
   */
  public void ensureCapacity(int expectedElements);
}