accumulators/statistics/min.hpp

0001 ///////////////////////////////////////////////////////////////////////////////
0002 // min.hpp
0003 //
0004 //  Copyright 2005 Eric Niebler. Distributed under the Boost
0005 //  Software License, Version 1.0. (See accompanying file
0006 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0007
0008 #ifndef BOOST_ACCUMULATORS_STATISTICS_MIN_HPP_EAN_28_10_2005
0009 #define BOOST_ACCUMULATORS_STATISTICS_MIN_HPP_EAN_28_10_2005
0010
0011 #include <limits>
0012 #include <boost/mpl/placeholders.hpp>
0013 #include <boost/accumulators/framework/accumulator_base.hpp>
0014 #include <boost/accumulators/framework/extractor.hpp>
0015 #include <boost/accumulators/framework/parameters/sample.hpp>
0016 #include <boost/accumulators/numeric/functional.hpp>
0017 #include <boost/accumulators/framework/depends_on.hpp>
0018 #include <boost/accumulators/statistics_fwd.hpp>
0019
0020 namespace boost { namespace accumulators
0021 {
0022
0023 namespace impl
0024 {
0025     ///////////////////////////////////////////////////////////////////////////////
0026     // min_impl
0027     template<typename Sample>
0028     struct min_impl
0029       : accumulator_base
0030     {
0031         // for boost::result_of
0032         typedef Sample result_type;
0033
0034         template<typename Args>
0035         min_impl(Args const &args)
0036           : min_(numeric::as_max(args[sample | Sample()]))
0037         {
0038         }
0039
0040         template<typename Args>
0041         void operator ()(Args const &args)
0042         {
0043             numeric::min_assign(this->min_, args[sample]);
0044         }
0045
0046         result_type result(dont_care) const
0047         {
0048             return this->min_;
0049         }
0050
0051         // make this accumulator serializeable
0052         template<class Archive>
0053         void serialize(Archive & ar, const unsigned int /* file_version */)
0054         {
0055             ar & min_;
0056         }
0057
0058     private:
0059         Sample min_;
0060     };
0061
0062 } // namespace impl
0063
0064 ///////////////////////////////////////////////////////////////////////////////
0065 // tag::min
0066 //
0067 namespace tag
0068 {
0069     struct min
0070       : depends_on<>
0071     {
0072         /// INTERNAL ONLY
0073         ///
0074         typedef accumulators::impl::min_impl<mpl::_1> impl;
0075     };
0076 }
0077
0078 ///////////////////////////////////////////////////////////////////////////////
0079 // extract::min
0080 //
0081 namespace extract
0082 {
0083     extractor<tag::min> const min = {};
0084
0085     BOOST_ACCUMULATORS_IGNORE_GLOBAL(min)
0086 }
0087
0088 using extract::min;
0089
0090 }} // namespace boost::accumulators
0091
0092 #endif