boost/msm/front/states.hpp
// Copyright 2008 Christophe Henry // henry UNDERSCORE christophe AT hotmail DOT com // This is an extended version of the state machine available in the boost::mpl library // Distributed under the same license as the original. // Copyright for the original version: // Copyright 2005 David Abrahams and Aleksey Gurtovoy. Distributed // under the Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) #ifndef BOOST_MSM_FRONT_STATES_H #define BOOST_MSM_FRONT_STATES_H #include <boost/mpl/bool.hpp> #include <boost/mpl/vector.hpp> #include <boost/mpl/transform.hpp> #include <boost/fusion/include/vector.hpp> #include <boost/fusion/include/make_vector.hpp> #include <boost/msm/front/common_states.hpp> #include <boost/msm/row_tags.hpp> //#include <boost/msm/back/metafunctions.hpp> namespace boost { namespace msm { namespace front { // transformation metafunction to end interrupt flags template <class Event> struct transform_to_end_interrupt { typedef boost::msm::EndInterruptFlag<Event> type; }; // transform a sequence of events into another one of EndInterruptFlag<Event> template <class Events> struct apply_end_interrupt_flag { typedef typename ::boost::mpl::transform< Events,transform_to_end_interrupt< ::boost::mpl::placeholders::_1> >::type type; }; // returns a mpl vector containing all end interrupt events if sequence, otherwise the same event template <class Event> struct get_interrupt_events { typedef typename ::boost::mpl::eval_if< ::boost::mpl::is_sequence<Event>, boost::msm::front::apply_end_interrupt_flag<Event>, boost::fusion::result_of::make_vector<boost::msm::EndInterruptFlag<Event> > >::type type; }; template <class Events> struct build_interrupt_state_flag_list { typedef ::boost::fusion::vector<boost::msm::InterruptedFlag> first_part; typedef typename ::boost::fusion::result_of::as_vector< typename ::boost::fusion::result_of::insert_range< first_part, typename ::boost::fusion::result_of::end< first_part >::type, Events >::type >::type type; }; struct no_sm_ptr { // tags typedef ::boost::mpl::bool_<false> needs_sm; }; struct sm_ptr { // tags typedef ::boost::mpl::bool_<true> needs_sm; }; // kept for backward compatibility struct NoSMPtr { // tags typedef ::boost::mpl::bool_<false> needs_sm; }; struct SMPtr { // tags typedef ::boost::mpl::bool_<true> needs_sm; }; // provides the typedefs and interface. Concrete states derive from it. // template argument: pointer-to-fsm policy template<class BASE = default_base_state,class SMPtrPolicy = no_sm_ptr> struct state : public boost::msm::front::detail::state_base<BASE>, SMPtrPolicy { // tags // default: no flag typedef ::boost::fusion::vector0<> flag_list; typedef ::boost::fusion::vector0<> internal_flag_list; //default: no deferred events typedef ::boost::fusion::vector0<> deferred_events; }; // terminate state simply defines the TerminateFlag flag // template argument: pointer-to-fsm policy template<class BASE = default_base_state,class SMPtrPolicy = no_sm_ptr> struct terminate_state : public boost::msm::front::detail::state_base<BASE>, SMPtrPolicy { // tags typedef ::boost::fusion::vector0<> flag_list; typedef ::boost::fusion::vector< boost::msm::TerminateFlag> internal_flag_list; //default: no deferred events typedef ::boost::fusion::vector0<> deferred_events; }; // terminate state simply defines the InterruptedFlag and EndInterruptFlag<EndInterruptEvent> flags // template argument: event which ends the interrupt // template argument: pointer-to-fsm policy template <class EndInterruptEvent,class BASE = default_base_state,class SMPtrPolicy = no_sm_ptr> struct interrupt_state : public boost::msm::front::detail::state_base<BASE>, SMPtrPolicy { // tags typedef ::boost::fusion::vector0<> flag_list; typedef typename boost::msm::front::build_interrupt_state_flag_list< typename boost::msm::front::get_interrupt_events<EndInterruptEvent>::type >::type internal_flag_list; //default: no deferred events typedef ::boost::fusion::vector0<> deferred_events; }; // not a state but a bunch of extra typedefs to handle direct entry into a composite state. To be derived from // template argument: zone index of this state template <int ZoneIndex=-1> struct explicit_entry { typedef int explicit_entry_state; enum {zone_index=ZoneIndex}; }; // to be derived from. Makes a type an entry (pseudo) state. Actually an almost full-fledged state // template argument: containing composite // template argument: zone index of this state // template argument: pointer-to-fsm policy template<int ZoneIndex=-1,class BASE = default_base_state,class SMPtrPolicy = no_sm_ptr> struct entry_pseudo_state : public boost::msm::front::detail::state_base<BASE>,SMPtrPolicy { // tags typedef int pseudo_entry; enum {zone_index=ZoneIndex}; typedef int explicit_entry_state; // default: no flag typedef ::boost::fusion::vector0<> flag_list; typedef ::boost::fusion::vector0<> internal_flag_list; //default: no deferred events typedef ::boost::fusion::vector0<> deferred_events; }; // to be derived from. Makes a state an exit (pseudo) state. Actually an almost full-fledged state // template argument: event to forward // template argument: pointer-to-fsm policy template<class Event,class BASE = default_base_state,class SMPtrPolicy = no_sm_ptr> struct exit_pseudo_state : public boost::msm::front::detail::state_base<BASE> , SMPtrPolicy { typedef Event event; typedef BASE Base; typedef SMPtrPolicy PtrPolicy; typedef int pseudo_exit; // default: no flag typedef ::boost::fusion::vector0<> flag_list; typedef ::boost::fusion::vector0<> internal_flag_list; //default: no deferred events typedef ::boost::fusion::vector0<> deferred_events; }; }}} #endif //BOOST_MSM_FRONT_STATES_H