float_utils.h

/*
 *    Copyright 2009 10gen Inc.
 *
 *    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.
 */

#pragma once

namespace mongo {

inline bool isNaN(double d) {
    return d != d;
}

inline bool isInf(double d, int* sign = 0) {
    volatile double tmp = d;

    if ((tmp == d) && ((tmp - d) != 0.0)) {
        if (sign) {
            *sign = (d < 0.0 ? -1 : 1);
        }
        return true;
    }

    if (sign) {
        *sign = 0;
    }

    return false;
}
}