org.drools.core.util.NumberUtils Maven / Gradle / Ivy
/*
* Copyright 2015 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
*
* 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 org.drools.core.util;
public class NumberUtils {
/**
* Checks if an addition of 2 longs caused an overflow
* @param op1
* @param op2
* @param result
* @return true if an overflow occurred, false otherwise
*/
public static boolean isAddOverflow( final long op1, final long op2, final long result ) {
// ((op1^result)&(op2^result))<0) is a shorthand for:
// ( (op1<0 && op2<0 && result>=0) ||
// (op1>0 && op2>0 && result<=0) )
return (( (op1^result) & (op2^result) ) < 0);
}
}