boost/statechart/deferral.hpp

   1 #ifndef BOOST_STATECHART_DEFERRAL_HPP_INCLUDED
   2 #define BOOST_STATECHART_DEFERRAL_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
  14
  15 namespace boost
  16 {
  17 namespace statechart
  18 {
  19
  20
  21
  22 class event_base;
  23
  24 //////////////////////////////////////////////////////////////////////////////
  25 template< class Event >
  26 class deferral
  27 {
  28   public:
  29     //////////////////////////////////////////////////////////////////////////
  30     // The following declarations should be private.
  31     // They are only public because many compilers lack template friends.
  32     //////////////////////////////////////////////////////////////////////////
  33     template< class State, class EventBase, class IdType >
  34     static detail::reaction_result react(
  35       State & stt, const EventBase &, const IdType & eventType )
  36     {
  37       if ( eventType == Event::static_type() )
  38       {
  39         return detail::result_utility::get_result( stt.defer_event() );
  40       }
  41       else
  42       {
  43         return detail::no_reaction;
  44       }
  45     }
  46 };
  47
  48 template<>
  49 class deferral< event_base >
  50 {
  51   public:
  52     //////////////////////////////////////////////////////////////////////////
  53     // The following declarations should be private.
  54     // They are only public because many compilers lack template friends.
  55     //////////////////////////////////////////////////////////////////////////
  56     template< class State, class EventBase, class IdType >
  57     static detail::reaction_result react(
  58       State & stt, const EventBase &, const IdType & )
  59     {
  60       return detail::result_utility::get_result( stt.defer_event() );
  61     }
  62 };
  63
  64
  65
  66 } // namespace statechart
  67 } // namespace boost
  68
  69
  70
  71 #endif