/*
* Copyright (C) 2011 The Guava Authors
*
* 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 net.simonvt.cathode.util.guava;
public final class LongMath {
public static long saturatedAdd(long a, long b) {
long naiveSum = a + b;
if ((a ^ b) < 0 | (a ^ naiveSum) >= 0) {
// If a and b have different signs or a has the same sign as the result then there was no
// overflow, return.
return naiveSum;
}
// we did over/under flow, if the sign is negative we should return MAX otherwise MIN
return Long.MAX_VALUE + ((naiveSum >>> (Long.SIZE - 1)) ^ 1);
}
private LongMath() {
}
}