Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: // error_of.hpp
Chris@16: //
Chris@16: //  Copyright 2005 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_ERROR_OF_HPP_EAN_29_11_2005
Chris@16: #define BOOST_ACCUMULATORS_STATISTICS_ERROR_OF_HPP_EAN_29_11_2005
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/framework/depends_on.hpp>
Chris@16: #include <boost/accumulators/statistics_fwd.hpp>
Chris@16: 
Chris@16: namespace boost { namespace accumulators
Chris@16: {
Chris@16: 
Chris@16: namespace impl
Chris@16: {
Chris@16:     /// INTERNAL ONLY
Chris@16:     ///
Chris@16:     template<typename Feature>
Chris@16:     struct this_feature_has_no_error_calculation
Chris@16:       : mpl::false_
Chris@16:     {
Chris@16:     };
Chris@16: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////////
Chris@16:     // error_of_impl
Chris@16:     /// INTERNAL ONLY
Chris@16:     ///
Chris@16:     template<typename Sample, typename Feature>
Chris@16:     struct error_of_impl
Chris@16:       : accumulator_base
Chris@16:     {
Chris@16:         // TODO: specialize this on the specific features that have errors we're
Chris@16:         // interested in.
Chris@16:         BOOST_MPL_ASSERT((this_feature_has_no_error_calculation<Feature>));
Chris@16: 
Chris@16:         // for boost::result_of
Chris@16:         typedef int result_type;
Chris@16: 
Chris@16:         error_of_impl(dont_care)
Chris@16:         {
Chris@16:         }
Chris@16: 
Chris@16:         result_type result(dont_care) const
Chris@16:         {
Chris@16:             return 0;
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16: } // namespace impl
Chris@16: 
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: // tag::error_of
Chris@16: //
Chris@16: namespace tag
Chris@16: {
Chris@16:     template<typename Feature>
Chris@16:     struct error_of
Chris@16:       : depends_on<Feature>
Chris@16:     {
Chris@16:         /// INTERNAL ONLY
Chris@16:         ///
Chris@16:         typedef accumulators::impl::error_of_impl<mpl::_1, Feature> impl;
Chris@16:     };
Chris@16: }
Chris@16: 
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: // extract::error_of
Chris@16: //
Chris@16: namespace extract
Chris@16: {
Chris@16:     BOOST_ACCUMULATORS_DEFINE_EXTRACTOR(tag, error_of, (typename))
Chris@16: }
Chris@16: 
Chris@16: using extract::error_of;
Chris@16: 
Chris@16: // make tag::error_of<tag::feature(modifier)> work
Chris@16: template<typename Feature>
Chris@16: struct as_feature<tag::error_of<Feature> >
Chris@16: {
Chris@16:     typedef tag::error_of<typename as_feature<Feature>::type> type;
Chris@16: };
Chris@16: 
Chris@16: // make error_of<tag::mean> work with non-void weights (should become
Chris@16: // error_of<tag::weighted_mean>
Chris@16: template<typename Feature>
Chris@16: struct as_weighted_feature<tag::error_of<Feature> >
Chris@16: {
Chris@16:     typedef tag::error_of<typename as_weighted_feature<Feature>::type> type;
Chris@16: };
Chris@16: 
Chris@16: }} // namespace boost::accumulators
Chris@16: 
Chris@16: #endif