jetbrains.exodus.util.MathUtil Maven / Gradle / Ivy
/**
* Copyright 2010 - 2022 JetBrains s.r.o.
*
* 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
*
* https://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 jetbrains.exodus.util;
public class MathUtil {
/**
* @param i integer
* @return discrete logarithm of specified integer base 2
*/
public static int integerLogarithm(final int i) {
return i <= 0 ? 0 : Integer.SIZE - Integer.numberOfLeadingZeros(i - 1);
}
/**
* @param l long
* @return discrete logarithm of specified integer base 2
*/
public static long longLogarithm(final long l) {
return l <= 0 ? 0 : Long.SIZE - Long.numberOfLeadingZeros(l - 1);
}
}