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116 lines
3.4 KiB
116 lines
3.4 KiB
/////////////////////////////////////////////////////////////////////////////// |
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// weighted_sum.hpp |
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// |
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// Copyright 2006 Eric Niebler, Olivier Gygi. 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_WEIGHTED_SUM_HPP_EAN_28_10_2005 |
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#define BOOST_ACCUMULATORS_STATISTICS_WEIGHTED_SUM_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/parameters/weight.hpp> |
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#include <boost/accumulators/framework/accumulators/external_accumulator.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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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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// weighted_sum_impl |
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template<typename Sample, typename Weight, typename Tag> |
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struct weighted_sum_impl |
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: accumulator_base |
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{ |
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typedef typename numeric::functional::multiplies<Sample, Weight>::result_type weighted_sample; |
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// for boost::result_of |
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typedef weighted_sample result_type; |
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template<typename Args> |
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weighted_sum_impl(Args const &args) |
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: weighted_sum_( |
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args[parameter::keyword<Tag>::get() | Sample()] |
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* numeric::one<Weight>::value |
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) |
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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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// what about overflow? |
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this->weighted_sum_ += args[parameter::keyword<Tag>::get()] * args[weight]; |
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} |
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result_type result(dont_care) const |
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{ |
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return this->weighted_sum_; |
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} |
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private: |
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weighted_sample weighted_sum_; |
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}; |
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} // namespace impl |
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/////////////////////////////////////////////////////////////////////////////// |
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// tag::weighted_sum |
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// |
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namespace tag |
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{ |
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struct weighted_sum |
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: depends_on<> |
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{ |
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/// INTERNAL ONLY |
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/// |
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typedef accumulators::impl::weighted_sum_impl<mpl::_1, mpl::_2, tag::sample> impl; |
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}; |
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template<typename VariateType, typename VariateTag> |
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struct weighted_sum_of_variates |
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: depends_on<> |
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{ |
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/// INTERNAL ONLY |
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/// |
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typedef accumulators::impl::weighted_sum_impl<VariateType, mpl::_2, VariateTag> impl; |
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}; |
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struct abstract_weighted_sum_of_variates |
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: depends_on<> |
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{ |
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}; |
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} |
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/////////////////////////////////////////////////////////////////////////////// |
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// extract::weighted_sum |
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// |
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namespace extract |
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{ |
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extractor<tag::weighted_sum> const weighted_sum = {}; |
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extractor<tag::abstract_weighted_sum_of_variates> const weighted_sum_of_variates = {}; |
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BOOST_ACCUMULATORS_IGNORE_GLOBAL(weighted_sum) |
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BOOST_ACCUMULATORS_IGNORE_GLOBAL(weighted_sum_of_variates) |
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} |
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using extract::weighted_sum; |
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using extract::weighted_sum_of_variates; |
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template<typename VariateType, typename VariateTag> |
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struct feature_of<tag::weighted_sum_of_variates<VariateType, VariateTag> > |
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: feature_of<tag::abstract_weighted_sum_of_variates> |
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{ |
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}; |
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}} // namespace boost::accumulators |
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#endif
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