| /////////////////////////////////////////////////////////////////////////////// |
| // sum.hpp |
| // |
| // Copyright 2005 Eric Niebler. Distributed under the Boost |
| // Software License, Version 1.0. (See accompanying file |
| // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| |
| #ifndef BOOST_ACCUMULATORS_STATISTICS_SUM_HPP_EAN_28_10_2005 |
| #define BOOST_ACCUMULATORS_STATISTICS_SUM_HPP_EAN_28_10_2005 |
| |
| #include <boost/mpl/placeholders.hpp> |
| #include <boost/accumulators/framework/accumulator_base.hpp> |
| #include <boost/accumulators/framework/extractor.hpp> |
| #include <boost/accumulators/numeric/functional.hpp> |
| #include <boost/accumulators/framework/parameters/sample.hpp> |
| #include <boost/accumulators/framework/parameters/weight.hpp> |
| #include <boost/accumulators/framework/accumulators/external_accumulator.hpp> |
| #include <boost/accumulators/framework/depends_on.hpp> |
| #include <boost/accumulators/statistics_fwd.hpp> |
| #include <boost/accumulators/statistics/count.hpp> |
| |
| namespace boost { namespace accumulators |
| { |
| |
| namespace impl |
| { |
| /////////////////////////////////////////////////////////////////////////////// |
| // sum_impl |
| template<typename Sample, typename Tag> |
| struct sum_impl |
| : accumulator_base |
| { |
| // for boost::result_of |
| typedef Sample result_type; |
| |
| template<typename Args> |
| sum_impl(Args const &args) |
| : sum(args[parameter::keyword<Tag>::get() | Sample()]) |
| { |
| } |
| |
| template<typename Args> |
| void operator ()(Args const &args) |
| { |
| // what about overflow? |
| this->sum += args[parameter::keyword<Tag>::get()]; |
| } |
| |
| result_type result(dont_care) const |
| { |
| return this->sum; |
| } |
| |
| private: |
| |
| Sample sum; |
| }; |
| |
| } // namespace impl |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // tag::sum |
| // tag::sum_of_weights |
| // tag::sum_of_variates |
| // |
| namespace tag |
| { |
| struct sum |
| : depends_on<> |
| { |
| /// INTERNAL ONLY |
| /// |
| typedef accumulators::impl::sum_impl<mpl::_1, tag::sample> impl; |
| }; |
| |
| struct sum_of_weights |
| : depends_on<> |
| { |
| typedef mpl::true_ is_weight_accumulator; |
| /// INTERNAL ONLY |
| /// |
| typedef accumulators::impl::sum_impl<mpl::_2, tag::weight> impl; |
| }; |
| |
| template<typename VariateType, typename VariateTag> |
| struct sum_of_variates |
| : depends_on<> |
| { |
| /// INTERNAL ONLY |
| /// |
| typedef mpl::always<accumulators::impl::sum_impl<VariateType, VariateTag> > impl; |
| }; |
| |
| struct abstract_sum_of_variates |
| : depends_on<> |
| { |
| }; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // extract::sum |
| // extract::sum_of_weights |
| // extract::sum_of_variates |
| // |
| namespace extract |
| { |
| extractor<tag::sum> const sum = {}; |
| extractor<tag::sum_of_weights> const sum_of_weights = {}; |
| extractor<tag::abstract_sum_of_variates> const sum_of_variates = {}; |
| |
| BOOST_ACCUMULATORS_IGNORE_GLOBAL(sum) |
| BOOST_ACCUMULATORS_IGNORE_GLOBAL(sum_of_weights) |
| BOOST_ACCUMULATORS_IGNORE_GLOBAL(sum_of_variates) |
| } |
| |
| using extract::sum; |
| using extract::sum_of_weights; |
| using extract::sum_of_variates; |
| |
| // So that mean can be automatically substituted with |
| // weighted_mean when the weight parameter is non-void. |
| template<> |
| struct as_weighted_feature<tag::sum> |
| { |
| typedef tag::weighted_sum type; |
| }; |
| |
| template<> |
| struct feature_of<tag::weighted_sum> |
| : feature_of<tag::sum> |
| {}; |
| |
| template<typename VariateType, typename VariateTag> |
| struct feature_of<tag::sum_of_variates<VariateType, VariateTag> > |
| : feature_of<tag::abstract_sum_of_variates> |
| { |
| }; |
| |
| }} // namespace boost::accumulators |
| |
| #endif |