Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: // count.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_COUNT_HPP_EAN_28_10_2005
Chris@16: #define BOOST_ACCUMULATORS_STATISTICS_COUNT_HPP_EAN_28_10_2005
Chris@16: 
Chris@16: #include <boost/mpl/always.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: 
Chris@16:     ///////////////////////////////////////////////////////////////////////////////
Chris@16:     // count_impl
Chris@16:     struct count_impl
Chris@16:       : accumulator_base
Chris@16:     {
Chris@16:         // for boost::result_of
Chris@16:         typedef std::size_t result_type;
Chris@16: 
Chris@16:         count_impl(dont_care)
Chris@16:           : cnt(0)
Chris@16:         {
Chris@16:         }
Chris@16: 
Chris@16:         void operator ()(dont_care)
Chris@16:         {
Chris@16:             ++this->cnt;
Chris@16:         }
Chris@16: 
Chris@16:         result_type result(dont_care) const
Chris@16:         {
Chris@16:             return this->cnt;
Chris@16:         }
Chris@16: 
Chris@16:     private:
Chris@16:         std::size_t cnt;
Chris@16:     };
Chris@16: 
Chris@16: } // namespace impl
Chris@16: 
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: // tag::count
Chris@16: //
Chris@16: namespace tag
Chris@16: {
Chris@16:     struct count
Chris@16:       : depends_on<>
Chris@16:     {
Chris@16:         /// INTERNAL ONLY
Chris@16:         ///
Chris@16:         typedef mpl::always<accumulators::impl::count_impl> impl;
Chris@16:     };
Chris@16: }
Chris@16: 
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: // extract::count
Chris@16: //
Chris@16: namespace extract
Chris@16: {
Chris@16:     extractor<tag::count> const count = {};
Chris@16: 
Chris@16:     BOOST_ACCUMULATORS_IGNORE_GLOBAL(count)
Chris@16: }
Chris@16: 
Chris@16: using extract::count;
Chris@16: 
Chris@16: }} // namespace boost::accumulators
Chris@16: 
Chris@16: #endif