ceph/src/boost/libs/accumulators/include/boost/accumulators/framework/accumulator_base.hpp

   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>
  33     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
  44     detail::void_ operator ()(dont_care)
  45     {
  46     }
  47
  48     typedef mpl::false_ is_droppable;
  49
  50     detail::void_ add_ref(dont_care)
  51     {
  52     }
  53
  54     detail::void_ drop(dont_care)
  55     {
  56     }
  57
  58     detail::void_ on_drop(dont_care)
  59     {
  60     }
  61 };
  62
  63 }} // namespace boost::accumulators
  64
  65 #endif