added msm

[SVN r63060]

doc/HTML/examples/AnonymousTutorial.cpp

@@ -0,0 +1,133 @@
+// Copyright 2010 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)
+
+#include <iostream>
+// back-end
+#include <boost/msm/back/state_machine.hpp>
+//front-end
+#include <boost/msm/front/state_machine_def.hpp>
+
+namespace msm = boost::msm;
+namespace mpl = boost::mpl;
+using namespace boost::msm::front;
+
+namespace
+{
+    // events
+    struct event1 {};
+
+
+    // front-end: define the FSM structure 
+    struct my_machine_ : public msm::front::state_machine_def<my_machine_>
+    {
+        // The list of FSM states
+        struct State1 : public msm::front::state<> 
+        {
+            // every (optional) entry/exit methods get the event passed.
+            template <class Event,class FSM>
+            void on_entry(Event const&,FSM& ) {std::cout << "entering: State1" << std::endl;}
+            template <class Event,class FSM>
+            void on_exit(Event const&,FSM& ) {std::cout << "leaving: State1" << std::endl;}
+        };
+        struct State2 : public msm::front::state<> 
+        { 
+            template <class Event,class FSM>
+            void on_entry(Event const& ,FSM&) {std::cout << "entering: State2" << std::endl;}
+            template <class Event,class FSM>
+            void on_exit(Event const&,FSM& ) {std::cout << "leaving: State2" << std::endl;}
+        };
+
+        struct State3 : public msm::front::state<> 
+        { 
+            // when stopped, the CD is loaded
+            template <class Event,class FSM>
+            void on_entry(Event const& ,FSM&) {std::cout << "entering: State3" << std::endl;}
+            template <class Event,class FSM>
+            void on_exit(Event const&,FSM& ) {std::cout << "leaving: State3" << std::endl;}
+        };
+
+        struct State4 : public msm::front::state<>
+        {
+            template <class Event,class FSM>
+            void on_entry(Event const&,FSM& ) {std::cout << "entering: State4" << std::endl;}
+            template <class Event,class FSM>
+            void on_exit(Event const&,FSM& ) {std::cout << "leaving: State4" << std::endl;}
+        };
+
+        // the initial state of the player SM. Must be defined
+        typedef State1 initial_state;
+
+        // transition actions
+        void State2ToState3(none const&)       { std::cout << "my_machine::State2ToState3\n"; }
+        void State3ToState4(none const&)       { std::cout << "my_machine::State3ToState4\n"; }
+        // guard conditions
+        bool always_true(none const& evt)
+        {
+            std::cout << "always_true" << std::endl;
+            return true;
+        }
+        bool always_false(none const& evt)
+        {
+            std::cout << "always_false" << std::endl;
+            return false;
+        }
+
+        typedef my_machine_ p; // makes transition table cleaner
+
+        // Transition table for player
+        struct transition_table : mpl::vector<
+            //    Start     Event         Next      Action               Guard
+            //  +---------+-------------+---------+---------------------+----------------------+
+           _row < State1  , none        , State2                                               >,
+          a_row < State2  , none        , State3  , &p::State2ToState3                         >,
+            //  +---------+-------------+---------+---------------------+----------------------+
+            row < State3  , none        , State4  , &p::State3ToState4  , &p::always_true      >,
+          g_row < State3  , none        , State4                        , &p::always_false     >,
+           _row < State4  , event1      , State1                                               >
+            //  +---------+-------------+---------+---------------------+----------------------+
+        > {};
+        // Replaces the default no-transition response.
+        template <class FSM,class Event>
+        void no_transition(Event const& e, FSM&,int state)
+        {
+            std::cout << "no transition from state " << state
+                << " on event " << typeid(e).name() << std::endl;
+        }
+    };
+    // Pick a back-end
+    typedef msm::back::state_machine<my_machine_> my_machine;
+
+    //
+    // Testing utilities.
+    //
+    static char const* const state_names[] = { "State1", "State2", "State3", "State4" };
+    void pstate(my_machine const& p)
+    {
+        std::cout << " -> " << state_names[p.current_state()[0]] << std::endl;
+    }
+
+    void test()
+    {        
+        my_machine p;
+
+        // needed to start the highest-level SM. This will call on_entry and mark the start of the SM
+        // in this case it will also immediately trigger all anonymous transitions
+        p.start(); 
+        // this event will bring us back to the initial state and thus, a new "loop" will be started
+        p.process_event(event1());
+
+    }
+}
+
+int main()
+{
+    test();
+    return 0;
+}