boost/accumulators/statistics/min.hpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // min.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_MIN_HPP_EAN_28_10_2005
   9 #define BOOST_ACCUMULATORS_STATISTICS_MIN_HPP_EAN_28_10_2005
  10
  11 #include <limits>
  12 #include <boost/mpl/placeholders.hpp>
  13 #include <boost/accumulators/framework/accumulator_base.hpp>
  14 #include <boost/accumulators/framework/extractor.hpp>
  15 #include <boost/accumulators/framework/parameters/sample.hpp>
  16 #include <boost/accumulators/numeric/functional.hpp>
  17 #include <boost/accumulators/framework/depends_on.hpp>
  18 #include <boost/accumulators/statistics_fwd.hpp>
  19
  20 namespace boost { namespace accumulators
  21 {
  22
  23 namespace impl
  24 {
  25     ///////////////////////////////////////////////////////////////////////////////
  26     // min_impl
  27     template<typename Sample>
  28     struct min_impl
  29       : accumulator_base
  30     {
  31         // for boost::result_of
  32         typedef Sample result_type;
  33
  34         template<typename Args>
  35         min_impl(Args const &args)
  36           : min_(numeric::as_max(args[sample | Sample()]))
  37         {
  38         }
  39
  40         template<typename Args>
  41         void operator ()(Args const &args)
  42         {
  43             numeric::min_assign(this->min_, args[sample]);
  44         }
  45
  46         result_type result(dont_care) const
  47         {
  48             return this->min_;
  49         }
  50
  51     private:
  52         Sample min_;
  53     };
  54
  55 } // namespace impl
  56
  57 ///////////////////////////////////////////////////////////////////////////////
  58 // tag::min
  59 //
  60 namespace tag
  61 {
  62     struct min
  63       : depends_on<>
  64     {
  65         /// INTERNAL ONLY
  66         ///
  67         typedef accumulators::impl::min_impl<mpl::_1> impl;
  68     };
  69 }
  70
  71 ///////////////////////////////////////////////////////////////////////////////
  72 // extract::min
  73 //
  74 namespace extract
  75 {
  76     extractor<tag::min> const min = {};
  77 }
  78
  79 using extract::min;
  80
  81 }} // namespace boost::accumulators
  82
  83 #endif