MathUtil.java

/*
 * Copyright (c) 2015-2016, Christoph Engelbert (aka noctarius) and
 * contributors. All rights reserved.
 *
 * 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 com.noctarius.tengi.core.impl;

public final class MathUtil {

    private MathUtil() {
    }

    public static boolean isPowerOfTwo(int x) {
        return (x & (x - 1)) == 0;
    }

    public static boolean isPowerOfTwo(long x) {
        return (x & (x - 1)) == 0;
    }

    public static int nextPowerOfTwo(int value) {
        if (!isPowerOfTwo(value)) {
            value--;
            value |= value >> 1;
            value |= value >> 2;
            value |= value >> 4;
            value |= value >> 8;
            value |= value >> 16;
            value++;
        }
        return value;
    }

}