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From "Remi Arntzen (JIRA)" <j...@apache.org>
Subject [jira] Created: (MATH-154) MathUtils addAndCheck and subAndCheck for long values
Date Mon, 31 Jul 2006 03:57:13 GMT
MathUtils addAndCheck and subAndCheck for long values
-----------------------------------------------------

                 Key: MATH-154
                 URL: http://issues.apache.org/jira/browse/MATH-154
             Project: Commons Math
          Issue Type: Improvement
    Affects Versions: Nightly Builds, 1.1 Final
            Reporter: Remi Arntzen


public static long addAndCheck(long x, long y) {
    BigInteger s = BigInteger.valueOf(x).add(BigInteger.valueOf(y);
    if (s.bitLength() + 1 > Long.SIZE) {
        throw new ArithmeticException("overflow: add");
    }
    return s.longValue();
}

public static long subAndCheck(long x, long y) {
    BigInteger s = BigInteger.valueOf(x).subtract(BigInteger.valueOf(y));
    if (s.bitLength() + 1 > Long.SIZE) {
        throw new ArithmeticException("overflow: add");
    }
    return s.longValue();
}

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