1/*
2 * Copyright 2012, The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *     http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef TIME_SERIES_H_
18
19#define TIME_SERIES_H_
20
21#include <sys/types.h>
22
23namespace android {
24
25struct TimeSeries {
26    TimeSeries();
27
28    void add(double val);
29
30    double mean() const;
31    double sdev() const;
32
33private:
34    enum {
35        kHistorySize = 20
36    };
37    double mValues[kHistorySize];
38
39    size_t mCount;
40    double mSum;
41};
42
43}  // namespace android
44
45#endif  // TIME_SERIES_H_
46
47