ceph/src/boost/libs/accumulators/include/boost/accumulators/statistics/error_of.hpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // error_of.hpp
   3 //
   4 //  Copyright 2005 Eric Niebler. Distributed under the Boost
   5 //  Software License, Version 1.0. (See accompanying file
   6 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7
   8 #ifndef BOOST_ACCUMULATORS_STATISTICS_ERROR_OF_HPP_EAN_29_11_2005
   9 #define BOOST_ACCUMULATORS_STATISTICS_ERROR_OF_HPP_EAN_29_11_2005
  10
  11 #include <boost/mpl/placeholders.hpp>
  12 #include <boost/accumulators/framework/accumulator_base.hpp>
  13 #include <boost/accumulators/framework/extractor.hpp>
  14 #include <boost/accumulators/framework/depends_on.hpp>
  15 #include <boost/accumulators/statistics_fwd.hpp>
  16
  17 namespace boost { namespace accumulators
  18 {
  19
  20 namespace impl
  21 {
  22     /// INTERNAL ONLY
  23     ///
  24     template<typename Feature>
  25     struct this_feature_has_no_error_calculation
  26       : mpl::false_
  27     {
  28     };
  29
  30     ///////////////////////////////////////////////////////////////////////////////
  31     // error_of_impl
  32     /// INTERNAL ONLY
  33     ///
  34     template<typename Sample, typename Feature>
  35     struct error_of_impl
  36       : accumulator_base
  37     {
  38         // TODO: specialize this on the specific features that have errors we're
  39         // interested in.
  40         BOOST_MPL_ASSERT((this_feature_has_no_error_calculation<Feature>));
  41
  42         // for boost::result_of
  43         typedef int result_type;
  44
  45         error_of_impl(dont_care)
  46         {
  47         }
  48
  49         result_type result(dont_care) const
  50         {
  51             return 0;
  52         }
  53     };
  54
  55 } // namespace impl
  56
  57 ///////////////////////////////////////////////////////////////////////////////
  58 // tag::error_of
  59 //
  60 namespace tag
  61 {
  62     template<typename Feature>
  63     struct error_of
  64       : depends_on<Feature>
  65     {
  66         /// INTERNAL ONLY
  67         ///
  68         typedef accumulators::impl::error_of_impl<mpl::_1, Feature> impl;
  69     };
  70 }
  71
  72 ///////////////////////////////////////////////////////////////////////////////
  73 // extract::error_of
  74 //
  75 namespace extract
  76 {
  77     BOOST_ACCUMULATORS_DEFINE_EXTRACTOR(tag, error_of, (typename))
  78 }
  79
  80 using extract::error_of;
  81
  82 // make tag::error_of<tag::feature(modifier)> work
  83 template<typename Feature>
  84 struct as_feature<tag::error_of<Feature> >
  85 {
  86     typedef tag::error_of<typename as_feature<Feature>::type> type;
  87 };
  88
  89 // make error_of<tag::mean> work with non-void weights (should become
  90 // error_of<tag::weighted_mean>
  91 template<typename Feature>
  92 struct as_weighted_feature<tag::error_of<Feature> >
  93 {
  94     typedef tag::error_of<typename as_weighted_feature<Feature>::type> type;
  95 };
  96
  97 }} // namespace boost::accumulators
  98
  99 #endif