Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: // rolling_sum.hpp
Chris@16: //
Chris@16: // Copyright 2008 Eric Niebler. Distributed under the Boost
Chris@16: // Software License, Version 1.0. (See accompanying file
Chris@16: // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_ACCUMULATORS_STATISTICS_ROLLING_SUM_HPP_EAN_26_12_2008
Chris@16: #define BOOST_ACCUMULATORS_STATISTICS_ROLLING_SUM_HPP_EAN_26_12_2008
Chris@16: 
Chris@16: #include <boost/mpl/placeholders.hpp>
Chris@16: #include <boost/accumulators/framework/accumulator_base.hpp>
Chris@16: #include <boost/accumulators/framework/extractor.hpp>
Chris@16: #include <boost/accumulators/numeric/functional.hpp>
Chris@16: #include <boost/accumulators/framework/parameters/sample.hpp>
Chris@16: #include <boost/accumulators/framework/depends_on.hpp>
Chris@16: #include <boost/accumulators/statistics_fwd.hpp>
Chris@16: #include <boost/accumulators/statistics/rolling_window.hpp>
Chris@16: 
Chris@16: namespace boost { namespace accumulators
Chris@16: {
Chris@16: namespace impl
Chris@16: {
Chris@16:     ///////////////////////////////////////////////////////////////////////////////
Chris@16:     // rolling_sum_impl
Chris@16:     //    returns the sum of the samples in the rolling window
Chris@16:     template<typename Sample>
Chris@16:     struct rolling_sum_impl
Chris@16:       : accumulator_base
Chris@16:     {
Chris@16:         typedef Sample result_type;
Chris@16: 
Chris@16:         template<typename Args>
Chris@16:         rolling_sum_impl(Args const &args)
Chris@16:           : sum_(args[sample | Sample()])
Chris@16:         {}
Chris@16: 
Chris@16:         template<typename Args>
Chris@16:         void operator ()(Args const &args)
Chris@16:         {
Chris@16:             if(is_rolling_window_plus1_full(args))
Chris@16:             {
Chris@16:                 this->sum_ -= rolling_window_plus1(args).front();
Chris@16:             }
Chris@16:             this->sum_ += args[sample];
Chris@16:         }
Chris@16: 
Chris@16:         template<typename Args>
Chris@101:         result_type result(Args const & /*args*/) const
Chris@16:         {
Chris@16:             return this->sum_;
Chris@16:         }
Chris@16: 
Chris@16:     private:
Chris@16:         Sample sum_;
Chris@16:     };
Chris@16: } // namespace impl
Chris@16: 
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: // tag::rolling_sum
Chris@16: //
Chris@16: namespace tag
Chris@16: {
Chris@16:     struct rolling_sum
Chris@16:       : depends_on< rolling_window_plus1 >
Chris@16:     {
Chris@16:         /// INTERNAL ONLY
Chris@16:         ///
Chris@16:         typedef accumulators::impl::rolling_sum_impl< mpl::_1 > impl;
Chris@16: 
Chris@16:         #ifdef BOOST_ACCUMULATORS_DOXYGEN_INVOKED
Chris@16:         /// tag::rolling_window::window_size named parameter
Chris@16:         static boost::parameter::keyword<tag::rolling_window_size> const window_size;
Chris@16:         #endif
Chris@16:     };
Chris@16: } // namespace tag
Chris@16: 
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: // extract::rolling_sum
Chris@16: //
Chris@16: namespace extract
Chris@16: {
Chris@16:     extractor<tag::rolling_sum> const rolling_sum = {};
Chris@16: 
Chris@16:     BOOST_ACCUMULATORS_IGNORE_GLOBAL(rolling_sum)
Chris@16: }
Chris@16: 
Chris@16: using extract::rolling_sum;
Chris@16: }} // namespace boost::accumulators
Chris@16: 
Chris@16: #endif