comparison DEPENDENCIES/generic/include/boost/msm/back/metafunctions.hpp @ 16:2665513ce2d3

Add boost headers

+// 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_BACK_METAFUNCTIONS_H
+#define BOOST_MSM_BACK_METAFUNCTIONS_H
+
+#include <boost/mpl/set.hpp>
+#include <boost/mpl/at.hpp>
+#include <boost/mpl/pair.hpp>
+#include <boost/mpl/map.hpp>
+#include <boost/mpl/int.hpp>
+#include <boost/mpl/has_xxx.hpp>
+#include <boost/mpl/find.hpp>
+#include <boost/mpl/count_if.hpp>
+#include <boost/mpl/fold.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/mpl/has_key.hpp>
+#include <boost/mpl/insert.hpp>
+#include <boost/mpl/next_prior.hpp>
+#include <boost/mpl/map.hpp>
+#include <boost/mpl/push_back.hpp>
+#include <boost/mpl/vector.hpp>
+#include <boost/mpl/is_sequence.hpp>
+#include <boost/mpl/size.hpp>
+#include <boost/mpl/transform.hpp>
+#include <boost/mpl/begin_end.hpp>
+#include <boost/mpl/bool.hpp>
+#include <boost/mpl/empty.hpp>
+#include <boost/mpl/identity.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/insert_range.hpp>
+#include <boost/mpl/front.hpp>
+#include <boost/mpl/logical.hpp>
+#include <boost/mpl/plus.hpp>
+#include <boost/mpl/copy_if.hpp>
+#include <boost/mpl/back_inserter.hpp>
+#include <boost/mpl/transform.hpp>
+
+#include <boost/type_traits/is_same.hpp>
+#include <boost/utility/enable_if.hpp>
+
+#include <boost/msm/row_tags.hpp>
+
+// mpl_graph graph implementation and depth first search
+#include <boost/msm/mpl_graph/incidence_list_graph.hpp>
+#include <boost/msm/mpl_graph/depth_first_search.hpp>
+
+BOOST_MPL_HAS_XXX_TRAIT_DEF(explicit_creation)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(pseudo_entry)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(pseudo_exit)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(concrete_exit_state)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(composite_tag)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(not_real_row_tag)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(event_blocking_flag)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(explicit_entry_state)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(completion_event)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(no_exception_thrown)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(no_message_queue)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(activate_deferred_events)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(wrapped_entry)
+BOOST_MPL_HAS_XXX_TRAIT_DEF(active_state_switch_policy)
+
+namespace boost { namespace msm { namespace back
+{
+template <typename Sequence, typename Range>
+struct set_insert_range
+{
+    typedef typename ::boost::mpl::fold<
+        Range,Sequence, 
+        ::boost::mpl::insert< ::boost::mpl::placeholders::_1, ::boost::mpl::placeholders::_2 >
+    >::type type;
+};
+
+// returns the current state type of a transition
+template <class Transition>
+struct transition_source_type
+{
+    typedef typename Transition::current_state_type type;
+};
+
+// returns the target state type of a transition
+template <class Transition>
+struct transition_target_type
+{
+    typedef typename Transition::next_state_type type;
+};
+
+// helper functions for generate_state_ids
+// create a pair of a state and a passed id for source and target states
+template <class Id,class Transition>
+struct make_pair_source_state_id
+{
+    typedef typename ::boost::mpl::pair<typename Transition::current_state_type,Id> type;
+};
+template <class Id,class Transition>
+struct make_pair_target_state_id
+{
+    typedef typename ::boost::mpl::pair<typename Transition::next_state_type,Id> type;
+};
+
+// iterates through a transition table and automatically generates ids starting at 0
+// first the source states, transition up to down
+// then the target states, up to down
+template <class stt>
+struct generate_state_ids
+{
+    typedef typename 
+        ::boost::mpl::fold<
+        stt,::boost::mpl::pair< ::boost::mpl::map< >, ::boost::mpl::int_<0> >,
+        ::boost::mpl::pair<
+            ::boost::mpl::if_<
+                     ::boost::mpl::has_key< ::boost::mpl::first< ::boost::mpl::placeholders::_1>,
+                                            transition_source_type< ::boost::mpl::placeholders::_2> >,
+                     ::boost::mpl::first< ::boost::mpl::placeholders::_1>,
+                     ::boost::mpl::insert< ::boost::mpl::first<mpl::placeholders::_1>,
+                                make_pair_source_state_id< ::boost::mpl::second< ::boost::mpl::placeholders::_1 >,
+                                                           ::boost::mpl::placeholders::_2> >
+                      >,
+            ::boost::mpl::if_<
+                    ::boost::mpl::has_key< ::boost::mpl::first< ::boost::mpl::placeholders::_1>,
+                                           transition_source_type< ::boost::mpl::placeholders::_2> >,
+                    ::boost::mpl::second< ::boost::mpl::placeholders::_1 >,
+                    ::boost::mpl::next< ::boost::mpl::second<mpl::placeholders::_1 > >
+                    >
+        > //pair
+        >::type source_state_ids;
+    typedef typename ::boost::mpl::first<source_state_ids>::type source_state_map;
+    typedef typename ::boost::mpl::second<source_state_ids>::type highest_state_id;
+
+
+    typedef typename 
+        ::boost::mpl::fold<
+        stt,::boost::mpl::pair<source_state_map,highest_state_id >,
+        ::boost::mpl::pair<
+            ::boost::mpl::if_<
+                     ::boost::mpl::has_key< ::boost::mpl::first< ::boost::mpl::placeholders::_1>,
+                                            transition_target_type< ::boost::mpl::placeholders::_2> >,
+                     ::boost::mpl::first< ::boost::mpl::placeholders::_1>,
+                     ::boost::mpl::insert< ::boost::mpl::first< ::boost::mpl::placeholders::_1>,
+                                make_pair_target_state_id< ::boost::mpl::second< ::boost::mpl::placeholders::_1 >,
+                                ::boost::mpl::placeholders::_2> >
+                     >,
+            ::boost::mpl::if_<
+                    ::boost::mpl::has_key< ::boost::mpl::first< ::boost::mpl::placeholders::_1>,
+                                           transition_target_type< ::boost::mpl::placeholders::_2> >,
+                    ::boost::mpl::second< ::boost::mpl::placeholders::_1 >,
+                    ::boost::mpl::next< ::boost::mpl::second< ::boost::mpl::placeholders::_1 > >
+                    >
+        > //pair
+        >::type all_state_ids;
+    typedef typename ::boost::mpl::first<all_state_ids>::type type;
+};
+
+template <class Fsm>
+struct get_active_state_switch_policy_helper
+{
+    typedef typename Fsm::active_state_switch_policy type;
+};
+template <class Iter>
+struct get_active_state_switch_policy_helper2
+{
+    typedef typename boost::mpl::deref<Iter>::type Fsm;
+    typedef typename Fsm::active_state_switch_policy type;
+};
+// returns the active state switching policy
+template <class Fsm>
+struct get_active_state_switch_policy
+{
+    typedef typename ::boost::mpl::find_if<
+        typename Fsm::configuration,
+        has_active_state_switch_policy< ::boost::mpl::placeholders::_1 > >::type iter;
+
+    typedef typename ::boost::mpl::eval_if<
+        typename ::boost::is_same<
+            iter, 
+            typename ::boost::mpl::end<typename Fsm::configuration>::type
+        >::type,
+        get_active_state_switch_policy_helper<Fsm>,
+        get_active_state_switch_policy_helper2< iter >
+    >::type type;
+};
+
+// returns the id of a given state
+template <class stt,class State>
+struct get_state_id
+{
+    typedef typename ::boost::mpl::at<typename generate_state_ids<stt>::type,State>::type type;
+    enum {value = type::value};
+};
+
+// returns a mpl::vector containing the init states of a state machine
+template <class States>
+struct get_initial_states 
+{
+    typedef typename ::boost::mpl::if_<
+        ::boost::mpl::is_sequence<States>,
+        States,
+        typename ::boost::mpl::push_back< ::boost::mpl::vector0<>,States>::type >::type type;
+};
+// returns a mpl::int_ containing the size of a region. If the argument is not a sequence, returns 1
+template <class region>
+struct get_number_of_regions 
+{
+    typedef typename mpl::if_<
+        ::boost::mpl::is_sequence<region>,
+        ::boost::mpl::size<region>,
+        ::boost::mpl::int_<1> >::type type;
+};
+
+// builds a mpl::vector of initial states
+//TODO remove duplicate from get_initial_states
+template <class region>
+struct get_regions_as_sequence 
+{
+    typedef typename ::boost::mpl::if_<
+        ::boost::mpl::is_sequence<region>,
+        region,
+        typename ::boost::mpl::push_back< ::boost::mpl::vector0<>,region>::type >::type type;
+};
+
+template <class ToCreateSeq>
+struct get_explicit_creation_as_sequence 
+{
+    typedef typename ::boost::mpl::if_<
+        ::boost::mpl::is_sequence<ToCreateSeq>,
+        ToCreateSeq,
+        typename ::boost::mpl::push_back< ::boost::mpl::vector0<>,ToCreateSeq>::type >::type type;
+};
+
+// returns true if 2 transitions have the same source (used to remove duplicates in search of composite states)
+template <class stt,class Transition1,class Transition2>
+struct have_same_source
+{
+    enum {current_state1 = get_state_id<stt,typename Transition1::current_state_type >::type::value};
+    enum {current_state2 = get_state_id<stt,typename Transition2::current_state_type >::type::value};
+    enum {value = ((int)current_state1 == (int)current_state2) };
+};
+
+
+// A metafunction that returns the Event associated with a transition.
+template <class Transition>
+struct transition_event
+{
+    typedef typename Transition::transition_event type;
+};
+
+// returns true for composite states
+template <class State>
+struct is_composite_state
+{
+    enum {value = has_composite_tag<State>::type::value};
+    typedef typename has_composite_tag<State>::type type;
+};
+
+// transform a transition table in a container of source states
+template <class stt>
+struct keep_source_names
+{
+    // instead of the rows we want only the names of the states (from source)
+    typedef typename 
+        ::boost::mpl::transform<
+        stt,transition_source_type< ::boost::mpl::placeholders::_1> >::type type;
+};
+
+// transform a transition table in a container of target states
+template <class stt>
+struct keep_target_names
+{
+    // instead of the rows we want only the names of the states (from source)
+    typedef typename 
+        ::boost::mpl::transform<
+        stt,transition_target_type< ::boost::mpl::placeholders::_1> >::type type;
+};
+
+template <class stt>
+struct generate_state_set
+{
+    // keep in the original transition table only the source/target state types
+    typedef typename keep_source_names<stt>::type sources;
+    typedef typename keep_target_names<stt>::type targets;
+    typedef typename 
+        ::boost::mpl::fold<
+        sources, ::boost::mpl::set<>,
+        ::boost::mpl::insert< ::boost::mpl::placeholders::_1, ::boost::mpl::placeholders::_2>
+        >::type source_set;
+    typedef typename 
+        ::boost::mpl::fold<
+        targets,source_set,
+        ::boost::mpl::insert< ::boost::mpl::placeholders::_1, ::boost::mpl::placeholders::_2>
+        >::type type;
+};
+
+// iterates through the transition table and generate a mpl::set<> containing all the events
+template <class stt>
+struct generate_event_set
+{
+    typedef typename 
+        ::boost::mpl::fold<
+            stt, ::boost::mpl::set<>,
+            ::boost::mpl::if_<
+                ::boost::mpl::has_key< ::boost::mpl::placeholders::_1, 
+                                       transition_event< ::boost::mpl::placeholders::_2> >,
+                ::boost::mpl::placeholders::_1,
+                ::boost::mpl::insert< ::boost::mpl::placeholders::_1,
+                                      transition_event< ::boost::mpl::placeholders::_2> > >
+        >::type type;
+};
+
+// returns a mpl::bool_<true> if State has Event as deferred event
+template <class State, class Event>
+struct has_state_delayed_event  
+{
+    typedef typename ::boost::mpl::find<typename State::deferred_events,Event>::type found;
+    typedef typename ::boost::mpl::if_<
+        ::boost::is_same<found,typename ::boost::mpl::end<typename State::deferred_events>::type >,
+        ::boost::mpl::bool_<false>,
+        ::boost::mpl::bool_<true> >::type type;
+};
+// returns a mpl::bool_<true> if State has any deferred event
+template <class State>
+struct has_state_delayed_events  
+{
+    typedef typename ::boost::mpl::if_<
+        ::boost::mpl::empty<typename State::deferred_events>,
+        ::boost::mpl::bool_<false>,
+        ::boost::mpl::bool_<true> >::type type;
+};
+
+// Template used to create dummy entries for initial states not found in the stt.
+template< typename T1 >
+struct not_a_row
+{
+    typedef int not_real_row_tag;
+    struct dummy_event 
+    {
+    };
+    typedef T1                  current_state_type;
+    typedef T1                  next_state_type;
+    typedef dummy_event         transition_event;
+};
+
+// metafunctions used to find out if a state is entry, exit or something else
+template <class State>
+struct is_pseudo_entry 
+{
+    typedef typename ::boost::mpl::if_< typename has_pseudo_entry<State>::type,
+        ::boost::mpl::bool_<true>,::boost::mpl::bool_<false> 
+    >::type type;
+};
+// says if a state is an exit pseudo state
+template <class State>
+struct is_pseudo_exit 
+{
+    typedef typename ::boost::mpl::if_< typename has_pseudo_exit<State>::type,
+        ::boost::mpl::bool_<true>, ::boost::mpl::bool_<false> 
+    >::type type;
+};
+// says if a state is an entry pseudo state or an explicit entry
+template <class State>
+struct is_direct_entry 
+{
+    typedef typename ::boost::mpl::if_< typename has_explicit_entry_state<State>::type,
+        ::boost::mpl::bool_<true>, ::boost::mpl::bool_<false> 
+    >::type type;
+};
+
+//converts a "fake" (simulated in a state_machine_ description )state into one which will really get created
+template <class StateType,class CompositeType>
+struct convert_fake_state
+{
+    // converts a state (explicit entry) into the state we really are going to create (explicit<>)
+    typedef typename ::boost::mpl::if_<
+        typename is_direct_entry<StateType>::type,
+        typename CompositeType::template direct<StateType>,
+        typename ::boost::mpl::identity<StateType>::type
+    >::type type;
+};
+
+template <class StateType>
+struct get_explicit_creation 
+{
+    typedef typename StateType::explicit_creation type;
+};
+
+template <class StateType>
+struct get_wrapped_entry 
+{
+    typedef typename StateType::wrapped_entry type;
+};
+// used for states created with explicit_creation
+// if the state is an explicit entry, we reach for the wrapped state
+// otherwise, this returns the state itself
+template <class StateType>
+struct get_wrapped_state 
+{
+    typedef typename ::boost::mpl::eval_if<
+                typename has_wrapped_entry<StateType>::type,
+                get_wrapped_entry<StateType>,
+                ::boost::mpl::identity<StateType> >::type type;
+};
+
+template <class Derived>
+struct create_stt 
+{
+    //typedef typename Derived::transition_table stt;
+    typedef typename Derived::real_transition_table Stt;
+    // get the state set
+    typedef typename generate_state_set<Stt>::type states;
+    // transform the initial region(s) in a sequence
+    typedef typename get_regions_as_sequence<typename Derived::initial_state>::type init_states;
+    // iterate through the initial states and add them in the stt if not already there
+    typedef typename 
+        ::boost::mpl::fold<
+        init_states,Stt,
+        ::boost::mpl::if_<
+                 ::boost::mpl::has_key<states, ::boost::mpl::placeholders::_2>,
+                 ::boost::mpl::placeholders::_1,
+                 ::boost::mpl::insert< ::boost::mpl::placeholders::_1, ::boost::mpl::end< ::boost::mpl::placeholders::_1>,
+                             not_a_row< get_wrapped_state< ::boost::mpl::placeholders::_2> > > 
+                  >
+        >::type with_init;
+    // do the same for states marked as explicitly created
+    typedef typename get_explicit_creation_as_sequence<
+       typename ::boost::mpl::eval_if<
+            typename has_explicit_creation<Derived>::type,
+            get_explicit_creation<Derived>,
+            ::boost::mpl::vector0<> >::type
+        >::type fake_explicit_created;
+
+    typedef typename 
+        ::boost::mpl::transform<
+        fake_explicit_created,convert_fake_state< ::boost::mpl::placeholders::_1,Derived> >::type explicit_created;
+
+    typedef typename 
+        ::boost::mpl::fold<
+        explicit_created,with_init,
+        ::boost::mpl::if_<
+                 ::boost::mpl::has_key<states, ::boost::mpl::placeholders::_2>,
+                 ::boost::mpl::placeholders::_1,
+                 ::boost::mpl::insert< ::boost::mpl::placeholders::_1, ::boost::mpl::end<mpl::placeholders::_1>,
+                             not_a_row< get_wrapped_state< ::boost::mpl::placeholders::_2> > > 
+                  >
+        >::type type;
+};
+
+// returns the transition table of a Composite state
+template <class Composite>
+struct get_transition_table
+{
+    typedef typename create_stt<Composite>::type type;
+};
+
+// recursively builds an internal table including those of substates, sub-substates etc.
+// variant for submachines
+template <class StateType,class IsComposite>
+struct recursive_get_internal_transition_table
+{
+    // get the composite's internal table
+    typedef typename StateType::internal_transition_table composite_table;
+    // and for every substate (state of submachine), recursively get the internal transition table
+    typedef typename generate_state_set<typename StateType::stt>::type composite_states;
+    typedef typename ::boost::mpl::fold<
+            composite_states, composite_table,
+            ::boost::mpl::insert_range< ::boost::mpl::placeholders::_1, ::boost::mpl::end< ::boost::mpl::placeholders::_1>,
+             recursive_get_internal_transition_table< ::boost::mpl::placeholders::_2, is_composite_state< ::boost::mpl::placeholders::_2> >
+             >
+    >::type type;
+};
+// stop iterating on leafs (simple states)
+template <class StateType>
+struct recursive_get_internal_transition_table<StateType, ::boost::mpl::false_ >
+{
+    typedef typename StateType::internal_transition_table type;
+};
+// recursively get a transition table for a given composite state.
+// returns the transition table for this state + the tables of all composite sub states recursively
+template <class Composite>
+struct recursive_get_transition_table
+{
+    // get the transition table of the state if it's a state machine
+    typedef typename ::boost::mpl::eval_if<typename is_composite_state<Composite>::type,
+        get_transition_table<Composite>,
+        ::boost::mpl::vector0<>
+    >::type org_table;
+
+    typedef typename generate_state_set<org_table>::type states;
+
+    // and for every substate, recursively get the transition table if it's a state machine
+    typedef typename ::boost::mpl::fold<
+        states,org_table,
+        ::boost::mpl::insert_range< ::boost::mpl::placeholders::_1, ::boost::mpl::end<mpl::placeholders::_1>,
+        recursive_get_transition_table< ::boost::mpl::placeholders::_2 > >
+    >::type type;
+
+};
+
+// metafunction used to say if a SM has pseudo exit states
+template <class Derived>
+struct has_fsm_deferred_events 
+{
+    typedef typename create_stt<Derived>::type Stt;
+    typedef typename generate_state_set<Stt>::type state_list;
+
+    typedef typename ::boost::mpl::or_<
+        typename has_activate_deferred_events<Derived>::type,
+        ::boost::mpl::bool_< ::boost::mpl::count_if<
+                typename Derived::configuration,
+                has_activate_deferred_events< ::boost::mpl::placeholders::_1 > >::value != 0> 
+    >::type found_in_fsm;
+
+    typedef typename ::boost::mpl::or_<
+            found_in_fsm,
+            ::boost::mpl::bool_< ::boost::mpl::count_if<
+                state_list,has_state_delayed_events<
+                    ::boost::mpl::placeholders::_1 > >::value != 0>
+            >::type type;
+};
+
+// returns a mpl::bool_<true> if State has any delayed event
+template <class Event>
+struct is_completion_event  
+{
+    typedef typename ::boost::mpl::if_<
+        has_completion_event<Event>,
+        ::boost::mpl::bool_<true>,
+        ::boost::mpl::bool_<false> >::type type;
+};
+// metafunction used to say if a SM has eventless transitions
+template <class Derived>
+struct has_fsm_eventless_transition 
+{
+    typedef typename create_stt<Derived>::type Stt;
+    typedef typename generate_event_set<Stt>::type event_list;
+
+    typedef ::boost::mpl::bool_< ::boost::mpl::count_if<
+        event_list,is_completion_event< ::boost::mpl::placeholders::_1 > >::value != 0> type;
+};
+template <class Derived>
+struct find_completion_events 
+{
+    typedef typename create_stt<Derived>::type Stt;
+    typedef typename generate_event_set<Stt>::type event_list;
+
+    typedef typename ::boost::mpl::fold<
+        event_list, ::boost::mpl::set<>,
+        ::boost::mpl::if_<
+                 is_completion_event< ::boost::mpl::placeholders::_2>,
+                 ::boost::mpl::insert< ::boost::mpl::placeholders::_1, ::boost::mpl::placeholders::_2 >, 
+                 ::boost::mpl::placeholders::_1 >
+    >::type type;
+};
+
+template <class Transition>
+struct make_vector 
+{
+    typedef ::boost::mpl::vector<Transition> type;
+};
+template< typename Entry > 
+struct get_first_element_pair_second
+{ 
+    typedef typename ::boost::mpl::front<typename Entry::second>::type type;
+}; 
+
+ //returns the owner of an explicit_entry state
+ //which is the containing SM if the transition originates from outside the containing SM
+ //or else the explicit_entry state itself
+template <class State,class ContainingSM>
+struct get_owner 
+{
+    typedef typename ::boost::mpl::if_<
+        typename ::boost::mpl::not_<typename ::boost::is_same<typename State::owner,
+                                                              ContainingSM >::type>::type,
+        typename State::owner, 
+        State >::type type;
+};
+
+template <class Sequence,class ContainingSM>
+struct get_fork_owner 
+{
+    typedef typename ::boost::mpl::front<Sequence>::type seq_front;
+    typedef typename ::boost::mpl::if_<
+                    typename ::boost::mpl::not_<
+                        typename ::boost::is_same<typename seq_front::owner,ContainingSM>::type>::type,
+                    typename seq_front::owner, 
+                    seq_front >::type type;
+};
+
+template <class StateType,class ContainingSM>
+struct make_exit 
+{
+    typedef typename ::boost::mpl::if_<
+             typename is_pseudo_exit<StateType>::type ,
+             typename ContainingSM::template exit_pt<StateType>,
+             typename ::boost::mpl::identity<StateType>::type
+            >::type type;
+};
+
+template <class StateType,class ContainingSM>
+struct make_entry 
+{
+    typedef typename ::boost::mpl::if_<
+        typename is_pseudo_entry<StateType>::type ,
+        typename ContainingSM::template entry_pt<StateType>,
+        typename ::boost::mpl::if_<
+                typename is_direct_entry<StateType>::type,
+                typename ContainingSM::template direct<StateType>,
+                typename ::boost::mpl::identity<StateType>::type
+                >::type
+        >::type type;
+};
+// metafunction used to say if a SM has pseudo exit states
+template <class StateType>
+struct has_exit_pseudo_states_helper 
+{
+    typedef typename StateType::stt Stt;
+    typedef typename generate_state_set<Stt>::type state_list;
+
+    typedef ::boost::mpl::bool_< ::boost::mpl::count_if<
+                state_list,is_pseudo_exit< ::boost::mpl::placeholders::_1> >::value != 0> type;
+};
+template <class StateType>
+struct has_exit_pseudo_states 
+{
+    typedef typename ::boost::mpl::eval_if<typename is_composite_state<StateType>::type,
+        has_exit_pseudo_states_helper<StateType>,
+        ::boost::mpl::bool_<false> >::type type;
+};
+
+// builds flags (add internal_flag_list and flag_list). internal_flag_list is used for terminate/interrupt states
+template <class StateType>
+struct get_flag_list 
+{
+    typedef typename ::boost::mpl::insert_range< 
+        typename StateType::flag_list, 
+        typename ::boost::mpl::end< typename StateType::flag_list >::type,
+        typename StateType::internal_flag_list
+    >::type type;
+};
+
+template <class StateType>
+struct is_state_blocking 
+{
+    typedef typename ::boost::mpl::fold<
+        typename get_flag_list<StateType>::type, ::boost::mpl::set<>,
+        ::boost::mpl::if_<
+                 has_event_blocking_flag< ::boost::mpl::placeholders::_2>,
+                 ::boost::mpl::insert< ::boost::mpl::placeholders::_1, ::boost::mpl::placeholders::_2 >, 
+                 ::boost::mpl::placeholders::_1 >
+    >::type blocking_flags;
+
+    typedef typename ::boost::mpl::if_<
+        ::boost::mpl::empty<blocking_flags>,
+        ::boost::mpl::bool_<false>,
+        ::boost::mpl::bool_<true> >::type type;
+};
+// returns a mpl::bool_<true> if fsm has an event blocking flag in one of its substates
+template <class StateType>
+struct has_fsm_blocking_states  
+{
+    typedef typename create_stt<StateType>::type Stt;
+    typedef typename generate_state_set<Stt>::type state_list;
+
+    typedef typename ::boost::mpl::fold<
+        state_list, ::boost::mpl::set<>,
+        ::boost::mpl::if_<
+                 is_state_blocking< ::boost::mpl::placeholders::_2>,
+                 ::boost::mpl::insert< ::boost::mpl::placeholders::_1, ::boost::mpl::placeholders::_2 >, 
+                 ::boost::mpl::placeholders::_1 >
+    >::type blocking_states;
+
+    typedef typename ::boost::mpl::if_<
+        ::boost::mpl::empty<blocking_states>,
+        ::boost::mpl::bool_<false>,
+        ::boost::mpl::bool_<true> >::type type;
+};
+
+template <class StateType>
+struct is_no_exception_thrown
+{
+    typedef ::boost::mpl::bool_< ::boost::mpl::count_if<
+        typename StateType::configuration,
+        has_no_exception_thrown< ::boost::mpl::placeholders::_1 > >::value != 0> found;
+
+    typedef typename ::boost::mpl::or_<
+        typename has_no_exception_thrown<StateType>::type,
+        found
+    >::type type;
+};
+
+template <class StateType>
+struct is_no_message_queue
+{
+    typedef ::boost::mpl::bool_< ::boost::mpl::count_if<
+        typename StateType::configuration,
+        has_no_message_queue< ::boost::mpl::placeholders::_1 > >::value != 0> found;
+
+    typedef typename ::boost::mpl::or_<
+        typename has_no_message_queue<StateType>::type,
+        found
+    >::type type;
+};
+
+template <class StateType>
+struct is_active_state_switch_policy 
+{
+    typedef ::boost::mpl::bool_< ::boost::mpl::count_if<
+        typename StateType::configuration,
+        has_active_state_switch_policy< ::boost::mpl::placeholders::_1 > >::value != 0> found;
+
+    typedef typename ::boost::mpl::or_<
+        typename has_active_state_switch_policy<StateType>::type,
+        found
+    >::type type;
+};
+
+template <class StateType>
+struct get_initial_event 
+{
+    typedef typename StateType::initial_event type;
+};
+
+template <class StateType>
+struct get_final_event 
+{
+    typedef typename StateType::final_event type;
+};
+
+template <class TransitionTable, class InitState>
+struct build_one_orthogonal_region 
+{
+     template<typename Row>
+     struct row_to_incidence :
+         ::boost::mpl::vector<
+                ::boost::mpl::pair<
+                    typename Row::next_state_type, 
+                    typename Row::transition_event>, 
+                typename Row::current_state_type, 
+                typename Row::next_state_type
+         > {};
+
+     template <class Seq, class Elt>
+     struct transition_incidence_list_helper 
+     {
+         typedef typename ::boost::mpl::push_back< Seq, row_to_incidence< Elt > >::type type;
+     };
+
+     typedef typename ::boost::mpl::fold<
+         TransitionTable,
+         ::boost::mpl::vector<>,
+         transition_incidence_list_helper< ::boost::mpl::placeholders::_1, ::boost::mpl::placeholders::_2>
+     >::type transition_incidence_list;
+
+     typedef ::boost::msm::mpl_graph::incidence_list_graph<transition_incidence_list>
+         transition_graph;
+
+     struct preordering_dfs_visitor : 
+         ::boost::msm::mpl_graph::dfs_default_visitor_operations 
+     {    
+         template<typename Node, typename Graph, typename State>
+         struct discover_vertex :
+             ::boost::mpl::insert<State, Node>
+         {};
+     };
+
+     typedef typename mpl::first< 
+         typename ::boost::msm::mpl_graph::depth_first_search<
+            transition_graph, 
+            preordering_dfs_visitor,
+            ::boost::mpl::set<>,
+            InitState
+         >::type
+     >::type type;
+};
+
+template <class Fsm>
+struct find_entry_states 
+{
+    typedef typename ::boost::mpl::copy<
+        typename Fsm::substate_list,
+        ::boost::mpl::inserter< 
+            ::boost::mpl::set0<>,
+            ::boost::mpl::if_<
+                has_explicit_entry_state< ::boost::mpl::placeholders::_2 >,
+                ::boost::mpl::insert< ::boost::mpl::placeholders::_1, ::boost::mpl::placeholders::_2>,
+                ::boost::mpl::placeholders::_1
+            >
+        >
+    >::type type;
+};
+
+template <class Set1, class Set2>
+struct is_common_element 
+{
+    typedef typename ::boost::mpl::fold<
+        Set1, ::boost::mpl::false_,
+        ::boost::mpl::if_<
+            ::boost::mpl::has_key<
+                Set2,
+                ::boost::mpl::placeholders::_2
+            >,
+            ::boost::mpl::true_,
+            ::boost::mpl::placeholders::_1
+        >
+    >::type type;
+};
+
+template <class EntryRegion, class AllRegions>
+struct add_entry_region 
+{
+    typedef typename ::boost::mpl::transform<
+        AllRegions, 
+        ::boost::mpl::if_<
+            is_common_element<EntryRegion, ::boost::mpl::placeholders::_1>,
+            set_insert_range< ::boost::mpl::placeholders::_1, EntryRegion>,
+            ::boost::mpl::placeholders::_1
+        >
+    >::type type;
+};
+
+// build a vector of regions states (as a set)
+// one set of states for every region
+template <class Fsm, class InitStates>
+struct build_orthogonal_regions 
+{
+    typedef typename 
+        ::boost::mpl::fold<
+            InitStates, ::boost::mpl::vector0<>,
+            ::boost::mpl::push_back< 
+                ::boost::mpl::placeholders::_1, 
+                build_one_orthogonal_region< typename Fsm::stt, ::boost::mpl::placeholders::_2 > >
+        >::type without_entries;
+
+    typedef typename 
+        ::boost::mpl::fold<
+        typename find_entry_states<Fsm>::type, ::boost::mpl::vector0<>,
+            ::boost::mpl::push_back< 
+                ::boost::mpl::placeholders::_1, 
+                build_one_orthogonal_region< typename Fsm::stt, ::boost::mpl::placeholders::_2 > >
+        >::type only_entries;
+
+    typedef typename ::boost::mpl::fold<
+        only_entries , without_entries,
+        add_entry_region< ::boost::mpl::placeholders::_2, ::boost::mpl::placeholders::_1>
+    >::type type;
+};
+
+template <class GraphAsSeqOfSets, class StateType>
+struct find_region_index
+{
+    typedef typename 
+        ::boost::mpl::fold<
+            GraphAsSeqOfSets, ::boost::mpl::pair< ::boost::mpl::int_< -1 > /*res*/, ::boost::mpl::int_<0> /*counter*/ >,
+            ::boost::mpl::if_<
+                ::boost::mpl::has_key< ::boost::mpl::placeholders::_2, StateType >,
+                ::boost::mpl::pair< 
+                    ::boost::mpl::second< ::boost::mpl::placeholders::_1 >,
+                    ::boost::mpl::next< ::boost::mpl::second< ::boost::mpl::placeholders::_1 > >
+                >,
+                ::boost::mpl::pair< 
+                    ::boost::mpl::first< ::boost::mpl::placeholders::_1 >,
+                    ::boost::mpl::next< ::boost::mpl::second< ::boost::mpl::placeholders::_1 > >
+                >
+            >
+        >::type result_pair;
+    typedef typename ::boost::mpl::first<result_pair>::type type;
+    enum {value = type::value};
+};
+
+template <class Fsm>
+struct check_regions_orthogonality
+{
+    typedef typename build_orthogonal_regions< Fsm,typename Fsm::initial_states>::type regions;
+    
+    typedef typename ::boost::mpl::fold<
+        regions, ::boost::mpl::int_<0>,
+        ::boost::mpl::plus< ::boost::mpl::placeholders::_1 , ::boost::mpl::size< ::boost::mpl::placeholders::_2> >
+    >::type number_of_states_in_regions;
+
+    typedef typename ::boost::mpl::fold<
+            regions,mpl::set0<>,
+            set_insert_range< 
+                    ::boost::mpl::placeholders::_1, 
+                    ::boost::mpl::placeholders::_2 > 
+    >::type one_big_states_set;
+
+    enum {states_in_regions_raw = number_of_states_in_regions::value};
+    enum {cumulated_states_in_regions_raw = ::boost::mpl::size<one_big_states_set>::value};
+};
+
+template <class Fsm>
+struct check_no_unreachable_state
+{
+    typedef typename check_regions_orthogonality<Fsm>::one_big_states_set states_in_regions;
+
+    typedef typename set_insert_range<
+        states_in_regions, 
+        typename ::boost::mpl::eval_if<
+            typename has_explicit_creation<Fsm>::type,
+            get_explicit_creation<Fsm>,
+            ::boost::mpl::vector0<>
+        >::type
+    >::type with_explicit_creation;
+
+    enum {states_in_fsm = ::boost::mpl::size< typename Fsm::substate_list >::value};
+    enum {cumulated_states_in_regions = ::boost::mpl::size< with_explicit_creation >::value};
+};
+
+// helper to find out if a SM has an active exit state and is therefore waiting for exiting
+template <class StateType,class OwnerFct,class FSM>
+inline
+typename ::boost::enable_if<typename ::boost::mpl::and_<typename is_composite_state<FSM>::type,
+                                                        typename is_pseudo_exit<StateType>::type>,bool >::type
+is_exit_state_active(FSM& fsm)
+{
+    typedef typename OwnerFct::type Composite;
+    //typedef typename create_stt<Composite>::type stt;
+    typedef typename Composite::stt stt;
+    int state_id = get_state_id<stt,StateType>::type::value;
+    Composite& comp = fsm.template get_state<Composite&>();
+    return (std::find(comp.current_state(),comp.current_state()+Composite::nr_regions::value,state_id)
+                            !=comp.current_state()+Composite::nr_regions::value);
+}
+template <class StateType,class OwnerFct,class FSM>
+inline
+typename ::boost::disable_if<typename ::boost::mpl::and_<typename is_composite_state<FSM>::type,
+                                                         typename is_pseudo_exit<StateType>::type>,bool >::type
+is_exit_state_active(FSM&)
+{
+    return false;
+}
+
+// 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::back::apply_end_interrupt_flag<Event>,
+        boost::mpl::vector1<boost::msm::EndInterruptFlag<Event> > >::type type;
+};
+
+template <class Events>
+struct build_interrupt_state_flag_list
+{
+    typedef ::boost::mpl::vector<boost::msm::InterruptedFlag> first_part;
+    typedef typename ::boost::mpl::insert_range< 
+        first_part, 
+        typename ::boost::mpl::end< first_part >::type,
+        Events
+    >::type type;
+};
+
+} } }//boost::msm::back
+
+#endif // BOOST_MSM_BACK_METAFUNCTIONS_H
+