FM / accumulators

/usr/include/boost/accumulators/framework/accumulators/

/usr/include/boost/accumulators/framework/accumulators

Name	Size	Mode	Actions
droppable_accumulator.hpp	10136	0644	edit dl rm
external_accumulator.hpp	3606	0644	edit dl rm
reference_accumulator.hpp	2537	0644	edit dl rm
value_accumulator.hpp	2420	0644	edit dl rm

Edit: /usr/include/boost/accumulators/framework/accumulators/external_accumulator.hpp (3606B)

#ifndef BOOST_ACCUMULATORS_FRAMEWORK_ACCUMULATORS_EXTERNAL_ACCUMULATOR_HPP_EAN_01_12_2005
#define BOOST_ACCUMULATORS_FRAMEWORK_ACCUMULATORS_EXTERNAL_ACCUMULATOR_HPP_EAN_01_12_2005

#include <boost/mpl/placeholders.hpp>
#include <boost/parameter/keyword.hpp>
#include <boost/accumulators/framework/extractor.hpp>
#include <boost/accumulators/framework/depends_on.hpp> // for feature_tag
#include <boost/accumulators/framework/accumulator_base.hpp>
#include <boost/accumulators/framework/accumulators/reference_accumulator.hpp>

namespace boost { namespace accumulators { namespace impl
{

//////////////////////////////////////////////////////////////////////////
    // external_impl
    /// INTERNAL ONLY
    ///
    template<typename Accumulator, typename Tag>
    struct external_impl
      : accumulator_base
    {
        typedef typename Accumulator::result_type result_type;
        typedef typename detail::feature_tag<Accumulator>::type feature_tag;

external_impl(dont_care) {}

template<typename Args>
        result_type result(Args const &args) const
        {
            return this->extract_(args, args[parameter::keyword<Tag>::instance | 0]);
        }

private:

template<typename Args>
        static result_type extract_(Args const &args, int)
        {
            // No named parameter passed to the extractor. Maybe the external
            // feature is held by reference<>.
            extractor<feature_tag> extract;
            return extract(accumulators::reference_tag<Tag>(args));
        }

template<typename Args, typename AccumulatorSet>
        static result_type extract_(Args const &, AccumulatorSet const &acc)
        {
            // OK, a named parameter for this external feature was passed to the
            // extractor, so use that.
            extractor<feature_tag> extract;
            return extract(acc);
        }
    };

} // namespace impl

namespace tag
{
    //////////////////////////////////////////////////////////////////////////
    // external
    template<typename Feature, typename Tag, typename AccumulatorSet>
    struct external
      : depends_on<reference<AccumulatorSet, Tag> >
    {
        typedef
            accumulators::impl::external_impl<
                detail::to_accumulator<Feature, mpl::_1, mpl::_2>
              , Tag
            >
        impl;
    };

template<typename Feature, typename Tag>
    struct external<Feature, Tag, void>
      : depends_on<>
    {
        typedef
            accumulators::impl::external_impl<
                detail::to_accumulator<Feature, mpl::_1, mpl::_2>
              , Tag
            >
        impl;
    };
}

// for the purposes of feature-based dependency resolution,
// external_accumulator<Feature, Tag> provides the same feature as Feature
template<typename Feature, typename Tag, typename AccumulatorSet>
struct feature_of<tag::external<Feature, Tag, AccumulatorSet> >
  : feature_of<Feature>
{
};

// Note: Usually, the extractor is pulled into the accumulators namespace with
// a using directive, not the tag. But the external<> feature doesn't have an
// extractor, so we can put the external tag in the accumulators namespace
// without fear of a name conflict.
using tag::external;

}} // namespace boost::accumulators

#endif

/////////////////////////////////////////////////////////////////////////////// // external_accumulator.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_FRAMEWORK_ACCUMULATORS_EXTERNAL_ACCUMULATOR_HPP_EAN_01_12_2005 #define BOOST_ACCUMULATORS_FRAMEWORK_ACCUMULATORS_EXTERNAL_ACCUMULATOR_HPP_EAN_01_12_2005 #include #include #include #include // for feature_tag #include #include namespace boost { namespace accumulators { namespace impl { ////////////////////////////////////////////////////////////////////////// // external_impl /// INTERNAL ONLY /// template struct external_impl : accumulator_base { typedef typename Accumulator::result_type result_type; typedef typename detail::feature_tag::type feature_tag; external_impl(dont_care) {} template result_type result(Args const &args) const { return this->extract_(args, args[parameter::keyword::instance | 0]); } private: template static result_type extract_(Args const &args, int) { // No named parameter passed to the extractor. Maybe the external // feature is held by reference<>. extractor extract; return extract(accumulators::reference_tag(args)); } template static result_type extract_(Args const &, AccumulatorSet const &acc) { // OK, a named parameter for this external feature was passed to the // extractor, so use that. extractor extract; return extract(acc); } }; } // namespace impl namespace tag { ////////////////////////////////////////////////////////////////////////// // external template struct external : depends_on > { typedef accumulators::impl::external_impl< detail::to_accumulator , Tag > impl; }; template struct external : depends_on<> { typedef accumulators::impl::external_impl< detail::to_accumulator , Tag > impl; }; } // for the purposes of feature-based dependency resolution, // external_accumulator provides the same feature as Feature template struct feature_of > : feature_of { }; // Note: Usually, the extractor is pulled into the accumulators namespace with // a using directive, not the tag. But the external<> feature doesn't have an // extractor, so we can put the external tag in the accumulators namespace // without fear of a name conflict. using tag::external; }} // namespace boost::accumulators #endif