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fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists, and queues with a small memory footprint and fast operations; it provides also big (64-bit) arrays, sets, and lists, sorting algorithms, fast, practical I/O classes for binary and text files, and facilities for memory mapping large files. This jar (fastutil-core.jar) contains data structures based on integers, longs, doubles, and objects, only; fastutil.jar contains all classes. If you have both jars in your dependencies, this jar should be excluded.

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/*
	* Copyright (C) 2002-2022 Sebastiano Vigna
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	*     http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/
package it.unimi.dsi.fastutil.longs;

import it.unimi.dsi.fastutil.Hash;

/**
 * A type-specific {@link Hash} interface.
 *
 * @see Hash
 */
public interface LongHash {
	/**
	 * A type-specific hash strategy.
	 *
	 * @see it.unimi.dsi.fastutil.Hash.Strategy
	 */
	interface Strategy {
		/**
		 * Returns the hash code of the specified element with respect to this hash strategy.
		 *
		 * @param e an element.
		 * @return the hash code of the given element with respect to this hash strategy.
		 */
		int hashCode(long e);

		/**
		 * Returns true if the given elements are equal with respect to this hash strategy.
		 *
		 * @param a an element.
		 * @param b another element.
		 * @return true if the two specified elements are equal with respect to this hash strategy.
		 */
		boolean equals(long a, long b);
	}
}