99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
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///////////////////////////////////////////////////////////////////////////////
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// rolling_sum.hpp
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//
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// Copyright 2008 Eric Niebler. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_ACCUMULATORS_STATISTICS_ROLLING_SUM_HPP_EAN_26_12_2008
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#define BOOST_ACCUMULATORS_STATISTICS_ROLLING_SUM_HPP_EAN_26_12_2008
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#include <boost/mpl/placeholders.hpp>
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#include <boost/accumulators/framework/accumulator_base.hpp>
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#include <boost/accumulators/framework/extractor.hpp>
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#include <boost/accumulators/numeric/functional.hpp>
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#include <boost/accumulators/framework/parameters/sample.hpp>
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#include <boost/accumulators/framework/depends_on.hpp>
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#include <boost/accumulators/statistics_fwd.hpp>
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#include <boost/accumulators/statistics/rolling_window.hpp>
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namespace boost { namespace accumulators
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{
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namespace impl
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{
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///////////////////////////////////////////////////////////////////////////////
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// rolling_sum_impl
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// returns the sum of the samples in the rolling window
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template<typename Sample>
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struct rolling_sum_impl
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: accumulator_base
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{
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typedef Sample result_type;
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template<typename Args>
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rolling_sum_impl(Args const &args)
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: sum_(args[sample | Sample()])
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{}
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template<typename Args>
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void operator ()(Args const &args)
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{
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if(is_rolling_window_plus1_full(args))
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{
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this->sum_ -= rolling_window_plus1(args).front();
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}
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this->sum_ += args[sample];
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}
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template<typename Args>
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result_type result(Args const & /*args*/) const
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{
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return this->sum_;
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}
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// make this accumulator serializeable
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template<class Archive>
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void serialize(Archive & ar, const unsigned int file_version)
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{
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ar & sum_;
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}
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private:
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Sample sum_;
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};
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} // namespace impl
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///////////////////////////////////////////////////////////////////////////////
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// tag::rolling_sum
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//
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namespace tag
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{
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struct rolling_sum
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: depends_on< rolling_window_plus1 >
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{
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/// INTERNAL ONLY
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///
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typedef accumulators::impl::rolling_sum_impl< mpl::_1 > impl;
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#ifdef BOOST_ACCUMULATORS_DOXYGEN_INVOKED
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/// tag::rolling_window::window_size named parameter
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static boost::parameter::keyword<tag::rolling_window_size> const window_size;
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#endif
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};
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} // namespace tag
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///////////////////////////////////////////////////////////////////////////////
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// extract::rolling_sum
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//
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namespace extract
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{
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extractor<tag::rolling_sum> const rolling_sum = {};
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BOOST_ACCUMULATORS_IGNORE_GLOBAL(rolling_sum)
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}
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using extract::rolling_sum;
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}} // namespace boost::accumulators
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#endif
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