74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
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///////////////////////////////////////////////////////////////////////////////
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// error_of.hpp
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//
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// Copyright 2005 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_ERROR_OF_MEAN_HPP_EAN_27_03_2006
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#define BOOST_ACCUMULATORS_STATISTICS_ERROR_OF_MEAN_HPP_EAN_27_03_2006
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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/framework/depends_on.hpp>
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#include <boost/accumulators/statistics_fwd.hpp>
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#include <boost/accumulators/statistics/error_of.hpp>
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#include <boost/accumulators/statistics/variance.hpp>
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#include <boost/accumulators/statistics/count.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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// error_of_mean_impl
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template<typename Sample, typename Variance>
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struct error_of_mean_impl
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: accumulator_base
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{
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// for boost::result_of
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typedef typename numeric::functional::fdiv<Sample, std::size_t>::result_type result_type;
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error_of_mean_impl(dont_care) {}
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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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using namespace std;
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extractor<Variance> const variance = {};
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return sqrt(numeric::fdiv(variance(args), count(args) - 1));
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}
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};
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} // namespace impl
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///////////////////////////////////////////////////////////////////////////////
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// tag::error_of
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//
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namespace tag
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{
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template<>
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struct error_of<mean>
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: depends_on<lazy_variance, count>
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{
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/// INTERNAL ONLY
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///
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typedef accumulators::impl::error_of_mean_impl<mpl::_1, lazy_variance> impl;
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};
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template<>
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struct error_of<immediate_mean>
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: depends_on<variance, count>
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{
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/// INTERNAL ONLY
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///
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typedef accumulators::impl::error_of_mean_impl<mpl::_1, variance> impl;
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};
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}
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}} // namespace boost::accumulators
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#endif
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