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#ifndef BOOST_STATECHART_TRANSITION_HPP_INCLUDED
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#define BOOST_STATECHART_TRANSITION_HPP_INCLUDED
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//////////////////////////////////////////////////////////////////////////////
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// Copyright 2002-2006 Andreas Huber Doenni
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// Distributed under the Boost Software License, Version 1.0. (See accompany-
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// ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//////////////////////////////////////////////////////////////////////////////
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#include <boost/statechart/result.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/cast.hpp> // boost::polymorphic_downcast
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#include <boost/type_traits/is_same.hpp>
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namespace boost
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{
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namespace statechart
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{
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namespace detail
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{
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//////////////////////////////////////////////////////////////////////////////
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template< class Event >
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struct no_context
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{
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void no_function( const Event & );
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};
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} // namespace detail
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class event_base;
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//////////////////////////////////////////////////////////////////////////////
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template< class Event, class Destination,
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class TransitionContext = detail::no_context< Event >,
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void ( TransitionContext::*pTransitionAction )( const Event & ) =
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&detail::no_context< Event >::no_function >
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class transition
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{
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private:
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//////////////////////////////////////////////////////////////////////////
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struct react_without_transition_action_impl
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{
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template< class State, class EventBase >
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static detail::reaction_result react( State & stt, const EventBase & )
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{
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return detail::result_utility::get_result(
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stt.template transit< Destination >() );
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}
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};
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struct react_base_with_transition_action_impl
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{
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template< class State, class EventBase >
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static detail::reaction_result react(
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State & stt, const EventBase & toEvent )
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{
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return detail::result_utility::get_result(
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stt.template transit< Destination >( pTransitionAction, toEvent ) );
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}
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};
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struct react_base
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{
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template< class State, class EventBase, class IdType >
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static detail::reaction_result react(
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State & stt, const EventBase & evt, const IdType & )
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{
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typedef typename mpl::if_<
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is_same< TransitionContext, detail::no_context< Event > >,
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react_without_transition_action_impl,
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react_base_with_transition_action_impl
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>::type impl;
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return impl::react( stt, evt );
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}
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};
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struct react_derived_with_transition_action_impl
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{
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template< class State, class EventBase >
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static detail::reaction_result react(
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State & stt, const EventBase & toEvent )
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{
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return detail::result_utility::get_result(
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stt.template transit< Destination >(
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pTransitionAction,
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*polymorphic_downcast< const Event * >( &toEvent ) ) );
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}
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};
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struct react_derived
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{
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template< class State, class EventBase, class IdType >
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static detail::reaction_result react(
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State & stt, const EventBase & evt, const IdType & eventType )
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{
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if ( eventType == Event::static_type() )
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{
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typedef typename mpl::if_<
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is_same< TransitionContext, detail::no_context< Event > >,
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react_without_transition_action_impl,
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react_derived_with_transition_action_impl
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>::type impl;
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return impl::react( stt, evt );
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}
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else
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{
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return detail::no_reaction;
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}
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}
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};
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public:
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//////////////////////////////////////////////////////////////////////////
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// The following declarations should be private.
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// They are only public because many compilers lack template friends.
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//////////////////////////////////////////////////////////////////////////
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template< class State, class EventBase, class IdType >
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static detail::reaction_result react(
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State & stt, const EventBase & evt, const IdType & eventType )
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{
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typedef typename mpl::if_<
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is_same< Event, event_base >, react_base, react_derived
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>::type impl;
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return impl::react( stt, evt, eventType );
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}
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};
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} // namespace statechart
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} // namespace boost
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#endif
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