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141 lines
3.7 KiB
141 lines
3.7 KiB
/////////////////////////////////////////////////////////////////////////////// |
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// sum.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_SUM_HPP_EAN_28_10_2005 |
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#define BOOST_ACCUMULATORS_STATISTICS_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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#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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// sum_impl |
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template<typename Sample, typename Tag> |
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struct sum_impl |
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: accumulator_base |
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{ |
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// for boost::result_of |
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typedef Sample result_type; |
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template<typename Args> |
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sum_impl(Args const &args) |
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: sum(args[parameter::keyword<Tag>::get() | Sample()]) |
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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->sum += args[parameter::keyword<Tag>::get()]; |
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} |
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result_type result(dont_care) const |
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{ |
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return this->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::sum |
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// tag::sum_of_weights |
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// tag::sum_of_variates |
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// |
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namespace tag |
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{ |
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struct 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::sum_impl<mpl::_1, tag::sample> impl; |
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}; |
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struct sum_of_weights |
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: depends_on<> |
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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::sum_impl<mpl::_2, tag::weight> impl; |
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}; |
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template<typename VariateType, typename VariateTag> |
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struct 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 mpl::always<accumulators::impl::sum_impl<VariateType, VariateTag> > impl; |
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}; |
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struct abstract_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::sum |
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// extract::sum_of_weights |
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// extract::sum_of_variates |
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// |
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namespace extract |
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{ |
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extractor<tag::sum> const sum = {}; |
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extractor<tag::sum_of_weights> const sum_of_weights = {}; |
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extractor<tag::abstract_sum_of_variates> const sum_of_variates = {}; |
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BOOST_ACCUMULATORS_IGNORE_GLOBAL(sum) |
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BOOST_ACCUMULATORS_IGNORE_GLOBAL(sum_of_weights) |
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BOOST_ACCUMULATORS_IGNORE_GLOBAL(sum_of_variates) |
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} |
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using extract::sum; |
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using extract::sum_of_weights; |
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using extract::sum_of_variates; |
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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::sum> |
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{ |
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typedef tag::weighted_sum type; |
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}; |
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template<> |
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struct feature_of<tag::weighted_sum> |
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: feature_of<tag::sum> |
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{}; |
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template<typename VariateType, typename VariateTag> |
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struct feature_of<tag::sum_of_variates<VariateType, VariateTag> > |
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: feature_of<tag::abstract_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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