prevent instantiation
git-svn-id: https://wala.svn.sourceforge.net/svnroot/wala/trunk@3509 f5eafffb-2e1d-0410-98e4-8ec43c5233c4
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@ -12,12 +12,13 @@ package com.ibm.wala.util.intset;
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/**
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/**
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* utilities for manipulating values at the bit-level.
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* utilities for manipulating values at the bit-level.
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*
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* @author Stephen Fink
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* @author Dave Grove
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*/
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*/
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public class Bits {
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public class Bits {
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// there's no reason to instantiate this class.
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private Bits() {
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}
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/**
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/**
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* Return the lower 8 bits (as an int) of an int
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* Return the lower 8 bits (as an int) of an int
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*/
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*/
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@ -26,7 +27,7 @@ public class Bits {
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}
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}
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/**
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/**
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* Return the lower 16 bits (as an int) of an int
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* Return the lower 16 bits (as an int) of an int
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*/
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*/
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public static int lower16(int value) {
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public static int lower16(int value) {
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return (value & 0xffff);
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return (value & 0xffff);
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@ -69,8 +70,7 @@ public class Bits {
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}
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}
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/**
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/**
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* Return the number of ones in the binary representation of an integer.
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* Return the number of ones in the binary representation of an integer. Hank Warren's Hacker's Delight algorithm
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* Hank Warren's Hacker's Delight algorithm
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*/
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*/
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public static int populationCount(int value) {
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public static int populationCount(int value) {
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int result = ((value & 0xAAAAAAAA) >>> 1) + (value & 0x55555555);
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int result = ((value & 0xAAAAAAAA) >>> 1) + (value & 0x55555555);
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@ -45,6 +45,10 @@ public class IntSetUtil {
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private final static boolean DEBUG = false;
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private final static boolean DEBUG = false;
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// there's no reason to instantiate this class
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private IntSetUtil() {
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}
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/**
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/**
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* This method constructs an appropriate mutable copy of set.
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* This method constructs an appropriate mutable copy of set.
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*
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*
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