1 /////////////////////////////////////////////////////////////////////////////// 2 // accumulator_base.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_FRAMEWORK_ACCUMULATORS_BASE_HPP_EAN_28_10_2005 9 #define BOOST_ACCUMULATORS_FRAMEWORK_ACCUMULATORS_BASE_HPP_EAN_28_10_2005 10 11 #include <boost/mpl/placeholders.hpp> 12 #include <boost/mpl/joint_view.hpp> 13 #include <boost/mpl/single_view.hpp> 14 #include <boost/mpl/fold.hpp> 15 #include <boost/mpl/contains.hpp> 16 #include <boost/mpl/empty_sequence.hpp> 17 #include <boost/accumulators/framework/accumulator_concept.hpp> 18 19 namespace boost { namespace accumulators 20 { 21 22 namespace detail 23 { 24 typedef void void_; 25 } 26 27 /////////////////////////////////////////////////////////////////////////////// 28 // dont_care 29 // 30 struct dont_care 31 { 32 template<typename Args> dont_careboost::accumulators::dont_care33 dont_care(Args const &) 34 { 35 } 36 }; 37 38 /////////////////////////////////////////////////////////////////////////////// 39 // accumulator_base 40 // 41 struct accumulator_base 42 { 43 // hidden if defined in derived classes operator ()boost::accumulators::accumulator_base44 detail::void_ operator ()(dont_care) 45 { 46 } 47 48 typedef mpl::false_ is_droppable; 49 add_refboost::accumulators::accumulator_base50 detail::void_ add_ref(dont_care) 51 { 52 } 53 dropboost::accumulators::accumulator_base54 detail::void_ drop(dont_care) 55 { 56 } 57 on_dropboost::accumulators::accumulator_base58 detail::void_ on_drop(dont_care) 59 { 60 } 61 }; 62 63 }} // namespace boost::accumulators 64 65 #endif 66