/****************************************************************************
 * Copyright (C) from 2009 to Present EPAM Systems.
 *
 * This file is part of Indigo toolkit.
 *
 * 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.
 ***************************************************************************/

#ifndef _statistics_h_
#define _statistics_h_

#include "base_c/defs.h"

namespace indigo
{

    class DLLEXPORT MeanEstimator
    {
    public:
        MeanEstimator();

        void addValue(float value);

        int getCount() const;
        // Manual change of the count parameter to avoid a lot addValue(0)
        void setCount(int count);

        float mean() const;
        float meanEsimationError() const;

    private:
        int _count;
        float _sum, _sum_sq;
    };

} // namespace indigo

#endif // _statistics_h_
