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