com.hazelcast.util.QuickMath Maven / Gradle / Ivy
package com.hazelcast.util;
/**
* The class {@code QuickMath} contains methods to perform optimized mathematical operations.
* Methods are allowed to put additional constraints on the range of input values if required for efficiency.
* Methods are not required to perform validation of input arguments, but they have to indicate the constraints
* in theirs contract.
*
*
*/
public final class QuickMath {
private QuickMath() { }
/**
* Return true if input argument is power of two.
* Input has to be a a positive integer.
*
* Result is undefined for zero or negative integers.
*
* @param x
* @return true if x is power of two
*/
public static boolean isPowerOfTwo(int x) {
return (x & (x - 1)) == 0;
}
/**
* Computes the remainder of the division of a by b.
* a has to be non-negative integer and b has to be power of two
* otherwise the result is undefined.
*
* @param a
* @param b
* @return remainder of the division of a by b.
*/
public static int mod(int a, int b) {
return a & (b - 1);
}
}