org.openscience.cdk.hash.Xorshift Maven / Gradle / Ivy
/*
* Copyright (c) 2013 John May
*
* Contact: [email protected]
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
* All we ask is that proper credit is given for our work, which includes
* - but is not limited to - adding the above copyright notice to the beginning
* of your source code files, and to any copyright notice that you may distribute
* with programs based on this work.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 U
*/
package org.openscience.cdk.hash;
/**
* A fast pseudorandom number generator based on feedback shift registers.
*
* @author John May
* @see Xorshift
* @see Xorshift
* random number generators
* @cdk.githash
* @cdk.module hash
*/
final class Xorshift extends Pseudorandom {
/**
* Generate the next pseudorandom number for the provided seed.
*
* @param seed random number seed
* @return the next pseudorandom number
*/
@Override
long next(long seed) {
seed = seed ^ seed << 21;
seed = seed ^ seed >>> 35;
return seed ^ seed << 4;
}
}
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