Added boost header
This commit is contained in:
Christophe Riccio
298
test/external/boost/accumulators/statistics/mean.hpp
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298
test/external/boost/accumulators/statistics/mean.hpp
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///////////////////////////////////////////////////////////////////////////////
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// mean.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_MEAN_HPP_EAN_28_10_2005
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#define BOOST_ACCUMULATORS_STATISTICS_MEAN_HPP_EAN_28_10_2005
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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/count.hpp>
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#include <boost/accumulators/statistics/sum.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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// mean_impl
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// lazy, by default
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template<typename Sample, typename SumFeature>
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struct 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::average<Sample, std::size_t>::result_type result_type;
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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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extractor<SumFeature> sum;
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return numeric::average(sum(args), count(args));
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}
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};
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template<typename Sample, typename Tag>
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struct immediate_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::average<Sample, std::size_t>::result_type result_type;
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template<typename Args>
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immediate_mean_impl(Args const &args)
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: mean(numeric::average(args[sample | Sample()], numeric::one<std::size_t>::value))
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{
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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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std::size_t cnt = count(args);
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this->mean = numeric::average(
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(this->mean * (cnt - 1)) + args[parameter::keyword<Tag>::get()]
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, cnt
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);
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}
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result_type result(dont_care) const
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{
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return this->mean;
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}
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private:
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result_type mean;
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};
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} // namespace impl
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///////////////////////////////////////////////////////////////////////////////
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// tag::mean
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// tag::immediate_mean
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// tag::mean_of_weights
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// tag::immediate_mean_of_weights
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// tag::mean_of_variates
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// tag::immediate_mean_of_variates
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//
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namespace tag
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{
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struct mean
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: depends_on<count, sum>
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{
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/// INTERNAL ONLY
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///
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typedef accumulators::impl::mean_impl<mpl::_1, sum> impl;
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};
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struct immediate_mean
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: depends_on<count>
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{
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/// INTERNAL ONLY
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///
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typedef accumulators::impl::immediate_mean_impl<mpl::_1, tag::sample> impl;
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};
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struct mean_of_weights
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: depends_on<count, sum_of_weights>
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{
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typedef mpl::true_ is_weight_accumulator;
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/// INTERNAL ONLY
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///
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typedef accumulators::impl::mean_impl<mpl::_2, sum_of_weights> impl;
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};
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struct immediate_mean_of_weights
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: depends_on<count>
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{
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typedef mpl::true_ is_weight_accumulator;
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/// INTERNAL ONLY
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///
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typedef accumulators::impl::immediate_mean_impl<mpl::_2, tag::weight> impl;
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};
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template<typename VariateType, typename VariateTag>
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struct mean_of_variates
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: depends_on<count, sum_of_variates<VariateType, VariateTag> >
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{
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/// INTERNAL ONLY
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///
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typedef mpl::always<accumulators::impl::mean_impl<VariateType, sum_of_variates<VariateType, VariateTag> > > impl;
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};
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template<typename VariateType, typename VariateTag>
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struct immediate_mean_of_variates
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: depends_on<count>
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{
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/// INTERNAL ONLY
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///
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typedef mpl::always<accumulators::impl::immediate_mean_impl<VariateType, VariateTag> > impl;
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};
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}
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///////////////////////////////////////////////////////////////////////////////
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// extract::mean
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// extract::mean_of_weights
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// extract::mean_of_variates
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//
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namespace extract
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{
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extractor<tag::mean> const mean = {};
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extractor<tag::mean_of_weights> const mean_of_weights = {};
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BOOST_ACCUMULATORS_DEFINE_EXTRACTOR(tag, mean_of_variates, (typename)(typename))
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BOOST_ACCUMULATORS_IGNORE_GLOBAL(mean)
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BOOST_ACCUMULATORS_IGNORE_GLOBAL(mean_of_weights)
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}
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using extract::mean;
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using extract::mean_of_weights;
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using extract::mean_of_variates;
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// mean(lazy) -> mean
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template<>
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struct as_feature<tag::mean(lazy)>
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{
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typedef tag::mean type;
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};
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// mean(immediate) -> immediate_mean
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template<>
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struct as_feature<tag::mean(immediate)>
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{
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typedef tag::immediate_mean type;
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};
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// mean_of_weights(lazy) -> mean_of_weights
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template<>
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struct as_feature<tag::mean_of_weights(lazy)>
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{
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typedef tag::mean_of_weights type;
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};
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// mean_of_weights(immediate) -> immediate_mean_of_weights
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template<>
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struct as_feature<tag::mean_of_weights(immediate)>
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{
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typedef tag::immediate_mean_of_weights type;
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};
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// mean_of_variates<VariateType, VariateTag>(lazy) -> mean_of_variates<VariateType, VariateTag>
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template<typename VariateType, typename VariateTag>
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struct as_feature<tag::mean_of_variates<VariateType, VariateTag>(lazy)>
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{
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typedef tag::mean_of_variates<VariateType, VariateTag> type;
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};
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// mean_of_variates<VariateType, VariateTag>(immediate) -> immediate_mean_of_variates<VariateType, VariateTag>
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template<typename VariateType, typename VariateTag>
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struct as_feature<tag::mean_of_variates<VariateType, VariateTag>(immediate)>
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{
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typedef tag::immediate_mean_of_variates<VariateType, VariateTag> type;
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};
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// for the purposes of feature-based dependency resolution,
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// immediate_mean provides the same feature as mean
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template<>
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struct feature_of<tag::immediate_mean>
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: feature_of<tag::mean>
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{
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};
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// for the purposes of feature-based dependency resolution,
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// immediate_mean provides the same feature as mean
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template<>
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struct feature_of<tag::immediate_mean_of_weights>
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: feature_of<tag::mean_of_weights>
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{
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};
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// for the purposes of feature-based dependency resolution,
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// immediate_mean provides the same feature as mean
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template<typename VariateType, typename VariateTag>
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struct feature_of<tag::immediate_mean_of_variates<VariateType, VariateTag> >
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: feature_of<tag::mean_of_variates<VariateType, VariateTag> >
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{
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};
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// So that mean can be automatically substituted with
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// weighted_mean when the weight parameter is non-void.
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template<>
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struct as_weighted_feature<tag::mean>
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{
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typedef tag::weighted_mean type;
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};
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template<>
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struct feature_of<tag::weighted_mean>
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: feature_of<tag::mean>
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{};
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// So that immediate_mean can be automatically substituted with
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// immediate_weighted_mean when the weight parameter is non-void.
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template<>
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struct as_weighted_feature<tag::immediate_mean>
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{
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typedef tag::immediate_weighted_mean type;
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};
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template<>
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struct feature_of<tag::immediate_weighted_mean>
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: feature_of<tag::immediate_mean>
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{};
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// So that mean_of_weights<> can be automatically substituted with
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// weighted_mean_of_variates<> when the weight parameter is non-void.
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template<typename VariateType, typename VariateTag>
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struct as_weighted_feature<tag::mean_of_variates<VariateType, VariateTag> >
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{
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typedef tag::weighted_mean_of_variates<VariateType, VariateTag> type;
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};
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template<typename VariateType, typename VariateTag>
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struct feature_of<tag::weighted_mean_of_variates<VariateType, VariateTag> >
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: feature_of<tag::mean_of_variates<VariateType, VariateTag> >
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{
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};
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// So that immediate_mean_of_weights<> can be automatically substituted with
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// immediate_weighted_mean_of_variates<> when the weight parameter is non-void.
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template<typename VariateType, typename VariateTag>
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struct as_weighted_feature<tag::immediate_mean_of_variates<VariateType, VariateTag> >
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{
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typedef tag::immediate_weighted_mean_of_variates<VariateType, VariateTag> type;
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};
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template<typename VariateType, typename VariateTag>
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struct feature_of<tag::immediate_weighted_mean_of_variates<VariateType, VariateTag> >
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: feature_of<tag::immediate_mean_of_variates<VariateType, VariateTag> >
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{
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};
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////////////////////////////////////////////////////////////////////////////
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//// droppable_accumulator<mean_impl>
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//// need to specialize droppable lazy mean to cache the result at the
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//// point the accumulator is dropped.
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///// INTERNAL ONLY
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/////
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//template<typename Sample, typename SumFeature>
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//struct droppable_accumulator<impl::mean_impl<Sample, SumFeature> >
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// : droppable_accumulator_base<
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// with_cached_result<impl::mean_impl<Sample, SumFeature> >
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// >
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//{
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// template<typename Args>
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// droppable_accumulator(Args const &args)
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// : droppable_accumulator::base(args)
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// {
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// }
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//};
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}} // namespace boost::accumulators
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#endif
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