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1 // Copyright 2008 Christophe Henry
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2 // henry UNDERSCORE christophe AT hotmail DOT com
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3 // This is an extended version of the state machine available in the boost::mpl library
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4 // Distributed under the same license as the original.
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5 // Copyright for the original version:
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6 // Copyright 2005 David Abrahams and Aleksey Gurtovoy. Distributed
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7 // under the Boost Software License, Version 1.0. (See accompanying
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8 // file LICENSE_1_0.txt or copy at
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9 // http://www.boost.org/LICENSE_1_0.txt)
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10
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11 #ifndef BOOST_MSM_ROW2_HELPER_HPP
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12 #define BOOST_MSM_ROW2_HELPER_HPP
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13
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14 #include <boost/mpl/bool.hpp>
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15 #include <boost/fusion/include/at_key.hpp>
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16
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17 namespace boost { namespace msm { namespace front
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18 {
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19 namespace detail
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20 {
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21 template<
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22 typename CalledForAction
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23 , typename Event
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24 , void (CalledForAction::*action)(Event const&)
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25 >
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26 struct row2_action_helper
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27 {
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28 template <class FSM,class Evt,class SourceState,class TargetState, class AllStates>
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29 static void call_helper(FSM&,Evt const& evt,SourceState&,TargetState&,
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30 AllStates& all_states,::boost::mpl::false_ const &)
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31 {
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32 // in this front-end, we don't need to know source and target states
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33 ( ::boost::fusion::at_key<CalledForAction>(all_states).*action)(evt);
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34 }
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35 template <class FSM,class Evt,class SourceState,class TargetState, class AllStates>
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36 static void call_helper(FSM& fsm,Evt const& evt,SourceState&,TargetState&,AllStates&,
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37 ::boost::mpl::true_ const &)
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38 {
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39 // in this front-end, we don't need to know source and target states
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40 (fsm.*action)(evt);
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41 }
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42 };
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43
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44 template<
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45 typename CalledForGuard
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46 , typename Event
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47 , bool (CalledForGuard::*guard)(Event const&)
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48 >
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49 struct row2_guard_helper
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50 {
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51 template <class FSM,class Evt,class SourceState,class TargetState,class AllStates>
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52 static bool call_helper(FSM&,Evt const& evt,SourceState&,TargetState&,
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53 AllStates& all_states, ::boost::mpl::false_ const &)
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54 {
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55 // in this front-end, we don't need to know source and target states
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56 return ( ::boost::fusion::at_key<CalledForGuard>(all_states).*guard)(evt);
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57 }
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58 template <class FSM,class Evt,class SourceState,class TargetState,class AllStates>
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59 static bool call_helper(FSM& fsm,Evt const& evt,SourceState&,TargetState&,
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60 AllStates&,::boost::mpl::true_ const &)
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61 {
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62 // in this front-end, we don't need to know source and target states
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63 return (fsm.*guard)(evt);
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64 }
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65 };
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66 }
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67
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68 }}}
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69
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70 #endif //BOOST_MSM_ROW2_HELPER_HPP
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71
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