ceph/src/boost/libs/statechart/include/boost/statechart/custom_reaction.hpp

   1 #ifndef BOOST_STATECHART_CUSTOM_REACTION_HPP_INCLUDED
   2 #define BOOST_STATECHART_CUSTOM_REACTION_HPP_INCLUDED
   3 //////////////////////////////////////////////////////////////////////////////
   4 // Copyright 2002-2006 Andreas Huber Doenni
   5 // Distributed under the Boost Software License, Version 1.0. (See accompany-
   6 // ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7 //////////////////////////////////////////////////////////////////////////////
   8
   9
  10
  11 #include <boost/statechart/result.hpp>
  12
  13 #include <boost/polymorphic_cast.hpp> // boost::polymorphic_downcast
  14
  15
  16
  17 namespace boost
  18 {
  19 namespace statechart
  20 {
  21
  22
  23
  24 class event_base;
  25
  26 //////////////////////////////////////////////////////////////////////////////
  27 template< class Event >
  28 class custom_reaction
  29 {
  30   public:
  31     //////////////////////////////////////////////////////////////////////////
  32     // The following declarations should be private.
  33     // They are only public because many compilers lack template friends.
  34     //////////////////////////////////////////////////////////////////////////
  35     template< class State, class EventBase, class IdType >
  36     static detail::reaction_result react(
  37       State & stt, const EventBase & evt, const IdType & eventType )
  38     {
  39       if ( eventType == Event::static_type() )
  40       {
  41         return detail::result_utility::get_result(
  42           stt.react( *polymorphic_downcast< const Event * >( &evt ) ) );
  43       }
  44       else
  45       {
  46         return detail::no_reaction;
  47       }
  48     }
  49 };
  50
  51 template<>
  52 class custom_reaction< event_base >
  53 {
  54   public:
  55     //////////////////////////////////////////////////////////////////////////
  56     // The following declarations should be private.
  57     // They are only public because many compilers lack template friends.
  58     //////////////////////////////////////////////////////////////////////////
  59     template< class State, class EventBase, class IdType >
  60     static detail::reaction_result react(
  61       State & stt, const EventBase & evt, const IdType & )
  62     {
  63       return detail::result_utility::get_result( stt.react( evt ) );
  64     }
  65 };
  66
  67
  68
  69 } // namespace statechart
  70 } // namespace boost
  71
  72
  73
  74 #endif