# moving_average.h

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    00001 /* $Id$ */
    00002
    00003 /*
    00004  * This file is part of OpenTTD.
    00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
    00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
    00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
    00008  */
    00009
    00012 #ifndef MOVING_AVERAGE_H_
    00013 #define MOVING_AVERAGE_H_
    00014
    00015 #include "stdafx.h"
    00016 #include "settings_type.h"
    00017 #include "core/math_func.hpp"
    00018
    00026 template<class Tvalue>
    00027 class MovingAverage {
    00028 protected:
    00029   uint length;
    00030
    00031 public:
    00036   FORCEINLINE MovingAverage(uint length) : length(length)
    00037     {
    00038       assert(this->length > 0);
    00039     }
    00040
    00045   FORCEINLINE uint Length() const
    00046     {
    00047       return this->length;
    00048     }
    00049
    00060   FORCEINLINE Tvalue Monthly(const Tvalue &value) const
    00061   {
    00062     return (value * 30) / (this->length);
    00063   }
    00064
    00070   FORCEINLINE Tvalue &Decrease(Tvalue &value) const
    00071   {
    00072     return value = (value * this->length) / (this->length + 1);
    00073   }
    00074 };
    00075
    00076 template<class Titem> void RunAverages();
    00077
    00078 #endif /* MOVING_AVERAGE_H_ */