kopia lustrzana https://github.com/ogre/habdec
80 wiersze
1.4 KiB
C++
Executable File
80 wiersze
1.4 KiB
C++
Executable File
/*
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Copyright 2018 Michal Fratczak
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This file is part of habdec.
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habdec is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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habdec is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with habdec. If not, see <https://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <memory>
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#include <iostream>
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namespace habdec
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{
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template<typename T>
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class Average
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{
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public:
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Average(size_t max_count, T init_val=0) : sum_(0), count_(0), max_count_(std::max(size_t(1),max_count))
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{
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add(init_val);
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};
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double add(const T& val)
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{
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double diff = get() - val;
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if(count_ == max_count_)
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{
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sum_ = get() * (max_count_-1) + val;
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}
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else
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{
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++count_;
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sum_ += val;
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}
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return diff;
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}
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double get() const
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{
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if(!count_)
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return sum_;
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return double(sum_)/count_;
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}
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operator double() const { double val = get(); return val; }
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void reset(const T& val)
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{
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sum_ = val;
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count_ = 1;
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}
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private:
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T sum_;
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size_t count_;
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const size_t max_count_;
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};
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} // namespace habdec
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