001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018package org.apache.commons.rng.core.source32; 019 020/** 021 * A fast 32-bit generator suitable for {@code float} generation. This is slightly faster than the 022 * all-purpose generator {@link XoRoShiRo64StarStar}. 023 * 024 * <p>This is a member of the Xor-Shift-Rotate family of generators. Memory footprint is 64 025 * bits.</p> 026 * 027 * @see <a href="http://xoshiro.di.unimi.it/xoroshiro64star.c">Original source code</a> 028 * @see <a href="http://xoshiro.di.unimi.it/">xorshiro / xoroshiro generators</a> 029 * @since 1.3 030 */ 031public class XoRoShiRo64Star extends AbstractXoRoShiRo64 { 032 /** 033 * Creates a new instance. 034 * 035 * @param seed Initial seed. 036 * If the length is larger than 2, only the first 2 elements will 037 * be used; if smaller, the remaining elements will be automatically 038 * set. A seed containing all zeros will create a non-functional generator. 039 */ 040 public XoRoShiRo64Star(int[] seed) { 041 super(seed); 042 } 043 044 /** 045 * Creates a new instance using a 2 element seed. 046 * A seed containing all zeros will create a non-functional generator. 047 * 048 * @param seed0 Initial seed element 0. 049 * @param seed1 Initial seed element 1. 050 */ 051 public XoRoShiRo64Star(int seed0, int seed1) { 052 super(seed0, seed1); 053 } 054 055 /** {@inheritDoc} */ 056 @Override 057 protected int nextOutput() { 058 return state0 * 0x9e3779bb; 059 } 060}