ceph/src/boost/boost/msm/front/detail/row2_helper.hpp

   1 // Copyright 2008 Christophe Henry
   2 // henry UNDERSCORE christophe AT hotmail DOT com
   3 // This is an extended version of the state machine available in the boost::mpl library
   4 // Distributed under the same license as the original.
   5 // Copyright for the original version:
   6 // Copyright 2005 David Abrahams and Aleksey Gurtovoy. Distributed
   7 // under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at
   9 // http://www.boost.org/LICENSE_1_0.txt)
  10
  11 #ifndef BOOST_MSM_ROW2_HELPER_HPP
  12 #define BOOST_MSM_ROW2_HELPER_HPP
  13
  14 #include <boost/mpl/bool.hpp>
  15 #include <boost/fusion/include/at_key.hpp>
  16
  17 namespace boost { namespace msm { namespace front
  18 {
  19     namespace detail
  20     {
  21         template<
  22             typename CalledForAction
  23             , typename Event
  24             , void (CalledForAction::*action)(Event const&)
  25         >
  26         struct row2_action_helper
  27         {
  28             template <class FSM,class Evt,class SourceState,class TargetState, class AllStates>
  29             static void call_helper(FSM&,Evt const& evt,SourceState&,TargetState&,
  30                                     AllStates& all_states,::boost::mpl::false_ const &)
  31             {
  32                 // in this front-end, we don't need to know source and target states
  33                 ( ::boost::fusion::at_key<CalledForAction>(all_states).*action)(evt);
  34             }
  35             template <class FSM,class Evt,class SourceState,class TargetState, class AllStates>
  36             static void call_helper(FSM& fsm,Evt const& evt,SourceState&,TargetState&,AllStates&,
  37                                     ::boost::mpl::true_ const &)
  38             {
  39                 // in this front-end, we don't need to know source and target states
  40                 (fsm.*action)(evt);
  41             }
  42         };
  43
  44         template<
  45             typename CalledForGuard
  46             , typename Event
  47             , bool (CalledForGuard::*guard)(Event const&)
  48         >
  49         struct row2_guard_helper
  50         {
  51             template <class FSM,class Evt,class SourceState,class TargetState,class AllStates>
  52             static bool call_helper(FSM&,Evt const& evt,SourceState&,TargetState&,
  53                                     AllStates& all_states, ::boost::mpl::false_ const &)
  54             {
  55                 // in this front-end, we don't need to know source and target states
  56                 return ( ::boost::fusion::at_key<CalledForGuard>(all_states).*guard)(evt);
  57             }
  58             template <class FSM,class Evt,class SourceState,class TargetState,class AllStates>
  59             static bool call_helper(FSM& fsm,Evt const& evt,SourceState&,TargetState&,
  60                                     AllStates&,::boost::mpl::true_ const &)
  61             {
  62                 // in this front-end, we don't need to know source and target states
  63                 return (fsm.*guard)(evt);
  64             }
  65         };
  66     }
  67
  68 }}}
  69
  70 #endif //BOOST_MSM_ROW2_HELPER_HPP
  71