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///////////////////////////////////////////////////////////////////////////////
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// error_of.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_ERROR_OF_HPP_EAN_29_11_2005
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#define BOOST_ACCUMULATORS_STATISTICS_ERROR_OF_HPP_EAN_29_11_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/framework/depends_on.hpp>
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#include <boost/accumulators/statistics_fwd.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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    /// INTERNAL ONLY
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    ///
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    template<typename Feature>
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    struct this_feature_has_no_error_calculation
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      : mpl::false_
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    {
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    };
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    ///////////////////////////////////////////////////////////////////////////////
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    // error_of_impl
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    /// INTERNAL ONLY
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    ///
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    template<typename Sample, typename Feature>
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    struct error_of_impl
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      : accumulator_base
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    {
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        // TODO: specialize this on the specific features that have errors we're
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        // interested in.
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        BOOST_MPL_ASSERT((this_feature_has_no_error_calculation<Feature>));
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        // for boost::result_of
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        typedef int result_type;
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        error_of_impl(dont_care)
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        {
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        }
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        result_type result(dont_care) const
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        {
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            return 0;
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        }
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    };
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} // namespace impl
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///////////////////////////////////////////////////////////////////////////////
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// tag::error_of
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//
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namespace tag
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{
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    template<typename Feature>
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    struct error_of
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      : depends_on<Feature>
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    {
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        /// INTERNAL ONLY
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        ///
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        typedef accumulators::impl::error_of_impl<mpl::_1, Feature> impl;
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    };
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}
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///////////////////////////////////////////////////////////////////////////////
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// extract::error_of
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//
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namespace extract
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{
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    BOOST_ACCUMULATORS_DEFINE_EXTRACTOR(tag, error_of, (typename))
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}
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using extract::error_of;
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// make tag::error_of<tag::feature(modifier)> work
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template<typename Feature>
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struct as_feature<tag::error_of<Feature> >
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{
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    typedef tag::error_of<typename as_feature<Feature>::type> type;
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};
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// make error_of<tag::mean> work with non-void weights (should become
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// error_of<tag::weighted_mean>
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template<typename Feature>
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struct as_weighted_feature<tag::error_of<Feature> >
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{
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    typedef tag::error_of<typename as_weighted_feature<Feature>::type> type;
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};
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}} // namespace boost::accumulators
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#endif