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https://git.rwth-aachen.de/acs/public/villas/node/
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92 lines
1.6 KiB
C++
92 lines
1.6 KiB
C++
/** A sliding/moving window.
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*
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* @file
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* @author Steffen Vogel <svogel2@eonerc.rwth-aachen.de>
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* @copyright 2014-2022, Institute for Automation of Complex Power Systems, EONERC
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* @license Apache License 2.0
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*********************************************************************************/
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#pragma once
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#include <deque>
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namespace villas {
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namespace dsp {
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template<typename T, typename Container = std::deque<T>>
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class Window : protected Container {
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public:
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using iterator = typename Container::iterator;
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using size_type = typename Container::size_type;
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protected:
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virtual
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T filter(T in, size_type i) const
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{
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return in;
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}
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class transform_iterator : public Container::const_iterator {
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protected:
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const Window *window;
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using base_iterator = typename Container::const_iterator;
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public:
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transform_iterator(const Window<T> *w) :
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base_iterator(w->Container::begin()),
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window(w)
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{ }
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T operator*()
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{
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auto i = (*this) - window->begin();
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const auto &v = base_iterator::operator*();
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return window->filter(v, i);
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}
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};
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public:
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Window(size_type l = 0, T i = 0) :
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Container(l, i)
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{ }
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T val(size_type pos)
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{
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return this->Container::operator[](pos);
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}
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T update(T in)
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{
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Container::push_back(in);
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auto out = (*this)[0];
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Container::pop_front();
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return out;
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}
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// Expose a limited number of functions from deque
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using Container::size;
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using Container::end;
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transform_iterator begin() const noexcept
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{
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return transform_iterator(this);
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}
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T operator[](size_type i) const noexcept
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{
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auto v = Container::operator[](i);
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return filter(v, i);
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}
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};
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} /* namespace dsp */
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} /* namespace villas */
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