///////////////////////////////////////////////////////////////////////////////
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// rolling_count.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_COUNT_HPP_EAN_26_12_2008
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#define BOOST_ACCUMULATORS_STATISTICS_ROLLING_COUNT_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_count_impl
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// returns the count of elements in the rolling window
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template<typename Sample>
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struct rolling_count_impl
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: accumulator_base
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{
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typedef std::size_t result_type;
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rolling_count_impl(dont_care)
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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 static_cast<std::size_t>(rolling_window_plus1(args).size()) - is_rolling_window_plus1_full(args);
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}
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// serialization is done by accumulators it depends on
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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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} // namespace impl
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///////////////////////////////////////////////////////////////////////////////
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// tag::rolling_count
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//
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namespace tag
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{
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struct rolling_count
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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_count_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_count
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//
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namespace extract
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{
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extractor<tag::rolling_count> const rolling_count = {};
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BOOST_ACCUMULATORS_IGNORE_GLOBAL(rolling_count)
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}
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using extract::rolling_count;
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}} // namespace boost::accumulators
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#endif
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