[Boost-commit] svn:boost r61963 - sandbox/metagraph/libs/metagraph/example

Subject: [Boost-commit] svn:boost r61963 - sandbox/metagraph/libs/metagraph/example
From: gordon_at_[hidden]
Date: 2010-05-14 04:03:05

Author: gordon.woodhull
Date: 2010-05-14 04:03:00 EDT (Fri, 14 May 2010)
New Revision: 61963
URL: http://svn.boost.org/trac/boost/changeset/61963

Log:
msm example
Added:
   sandbox/metagraph/libs/metagraph/example/msm_adaptor.cpp   (contents, props changed)
Text files modified: 
   sandbox/metagraph/libs/metagraph/example/depth_first_search.cpp |    16 ++++++++--------                        
   1 files changed, 8 insertions(+), 8 deletions(-)

Modified: sandbox/metagraph/libs/metagraph/example/depth_first_search.cpp
==============================================================================
--- sandbox/metagraph/libs/metagraph/example/depth_first_search.cpp	(original)
+++ sandbox/metagraph/libs/metagraph/example/depth_first_search.cpp	2010-05-14 04:03:00 EDT (Fri, 14 May 2010)
@@ -100,10 +100,10 @@
 // preordering just those starting at C
 typedef mpl::first<mpl_graph::
     depth_first_search<some_adjacency_list_graph,
-                           preordering_visitor, 
-                           mpl::vector<>,
-                           C>::type>::type 
-                    preorder_adj_from_c;
+                       preordering_visitor, 
+                       mpl::vector<>,
+                       C>::type>::type 
+                preorder_adj_from_c;
 BOOST_MPL_ASSERT(( mpl::equal<preorder_adj_from_c::type, mpl::vector<C,D,E,F> > ));
 
 
@@ -137,10 +137,10 @@
 // preordering starting at B
 typedef mpl::first<mpl_graph::
     depth_first_search<some_incidence_list_graph,
-                           preordering_visitor,
-                           mpl::vector<>,
-                           B>::type>::type 
-                    preorder_inc_from_b;
+                       preordering_visitor,
+                       mpl::vector<>,
+                       B>::type>::type 
+                preorder_inc_from_b;
 BOOST_MPL_ASSERT(( mpl::equal<preorder_inc_from_b::type, mpl::vector<B,C,D,E,F> > ));
 
 

Added: sandbox/metagraph/libs/metagraph/example/msm_adaptor.cpp
==============================================================================
--- (empty file)
+++ sandbox/metagraph/libs/metagraph/example/msm_adaptor.cpp	2010-05-14 04:03:00 EDT (Fri, 14 May 2010)
@@ -0,0 +1,257 @@
+// Copyright 2010 Gordon Woodhull  
+// simplified from MSMv2.10/libs/msm/doc/HTML/examples/SimpleTutorial.cpp
+// for the purpose of showing how to run mpl_graph algorithms on MSMs
+// and distributed same as below
+// 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)
+
+#include <iostream>
+// back-end
+#include <boost/msm/back/state_machine.hpp>
+//front-end
+#include <boost/msm/front/state_machine_def.hpp>
+
+#ifndef SKIP_DFS
+
+// mpl_graph graph implementation and depth first search
+#include <boost/metagraph/mpl_graph/incidence_list_graph.hpp>
+#include <boost/metagraph/mpl_graph/depth_first_search.hpp>
+
+#endif
+
+namespace msm = boost::msm;
+namespace mpl = boost::mpl;
+
+#ifndef SKIP_DFS
+namespace mpl_graph = boost::metagraph::mpl_graph;
+#endif
+
+namespace
+{
+    // events
+    struct play {};
+    struct end_pause {};
+    struct stop {};
+    struct pause {};
+    struct open_close {};
+
+    // A "complicated" event type that carries some data.
+	enum DiskTypeEnum
+    {
+        DISK_CD=0,
+        DISK_DVD=1
+    };
+    struct cd_detected
+    {
+        cd_detected(std::string name, DiskTypeEnum diskType)
+            : name(name),
+            disc_type(diskType)
+        {}
+
+        std::string name;
+        DiskTypeEnum disc_type;
+    };
+
+    // front-end: define the FSM structure 
+    struct player_ : public msm::front::state_machine_def<player_>
+    {
+        // The list of FSM states
+        struct Empty : 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: Empty" << std::endl;}
+            template <class Event,class FSM>
+            void on_exit(Event const&,FSM& ) {std::cout << "leaving: Empty" << std::endl;}
+        };
+        struct Open : public msm::front::state<> 
+        {	 
+            template <class Event,class FSM>
+            void on_entry(Event const& ,FSM&) {std::cout << "entering: Open" << std::endl;}
+            template <class Event,class FSM>
+            void on_exit(Event const&,FSM& ) {std::cout << "leaving: Open" << std::endl;}
+        };
+
+        // sm_ptr still supported but deprecated as functors are a much better way to do the same thing
+        struct Stopped : public msm::front::state<msm::front::default_base_state,msm::front::sm_ptr> 
+        {	 
+            template <class Event,class FSM>
+            void on_entry(Event const& ,FSM&) {std::cout << "entering: Stopped" << std::endl;}
+            template <class Event,class FSM>
+            void on_exit(Event const&,FSM& ) {std::cout << "leaving: Stopped" << std::endl;}
+            void set_sm_ptr(player_* pl)
+            {
+                m_player=pl;
+            }
+            player_* m_player;
+        };
+
+        struct Playing : public msm::front::state<>
+        {
+            template <class Event,class FSM>
+            void on_entry(Event const&,FSM& ) {std::cout << "entering: Playing" << std::endl;}
+            template <class Event,class FSM>
+            void on_exit(Event const&,FSM& ) {std::cout << "leaving: Playing" << std::endl;}
+        };
+
+        // state not defining any entry or exit
+        struct Paused : public msm::front::state<>
+        {
+        };
+
+        // the initial state of the player SM. Must be defined
+        typedef Empty initial_state;
+
+        // transition actions
+        void start_playback(play const&)       { std::cout << "player::start_playback\n"; }
+        void open_drawer(open_close const&)    { std::cout << "player::open_drawer\n"; }
+        void close_drawer(open_close const&)   { std::cout << "player::close_drawer\n"; }
+        void store_cd_info(cd_detected const&) { std::cout << "player::store_cd_info\n"; }
+        void stop_playback(stop const&)        { std::cout << "player::stop_playback\n"; }
+        void pause_playback(pause const&)      { std::cout << "player::pause_playback\n"; }
+        void resume_playback(end_pause const&)      { std::cout << "player::resume_playback\n"; }
+        void stop_and_open(open_close const&)  { std::cout << "player::stop_and_open\n"; }
+        void stopped_again(stop const&)	{std::cout << "player::stopped_again\n";}
+        // guard conditions
+        bool good_disk_format(cd_detected const& evt)
+        {
+            // to test a guard condition, let's say we understand only CDs, not DVD
+            if (evt.disc_type != DISK_CD)
+            {
+                std::cout << "wrong disk, sorry" << std::endl;
+                return false;
+            }
+            return true;
+        }
+        // used to show a transition conflict. This guard will simply deactivate one transition and thus
+        // solve the conflict
+        bool auto_start(cd_detected const&)
+        {
+            return false;
+        }
+
+        typedef player_ p; // makes transition table cleaner
+
+        // Transition table for player
+        struct transition_table : mpl::vector<
+            //    Start     Event         Next      Action				 Guard
+            //  +---------+-------------+---------+---------------------+----------------------+
+          a_row < Stopped , play        , Playing , &p::start_playback                         >,
+          a_row < Stopped , open_close  , Open    , &p::open_drawer                            >,
+           _row < Stopped , stop        , Stopped                                              >,
+            //  +---------+-------------+---------+---------------------+----------------------+
+          a_row < Open    , open_close  , Empty   , &p::close_drawer                           >,
+            //  +---------+-------------+---------+---------------------+----------------------+
+          a_row < Empty   , open_close  , Open    , &p::open_drawer                            >,
+            row < Empty   , cd_detected , Stopped , &p::store_cd_info   ,&p::good_disk_format  >,
+            row < Empty   , cd_detected , Playing , &p::store_cd_info   ,&p::auto_start        >,
+            //  +---------+-------------+---------+---------------------+----------------------+
+          a_row < Playing , stop        , Stopped , &p::stop_playback                          >,
+          a_row < Playing , pause       , Paused  , &p::pause_playback                         >,
+          a_row < Playing , open_close  , Open    , &p::stop_and_open                          >,
+            //  +---------+-------------+---------+---------------------+----------------------+
+          a_row < Paused  , end_pause   , Playing , &p::resume_playback                        >,
+          a_row < Paused  , stop        , Stopped , &p::stop_playback                          >,
+          a_row < Paused  , open_close  , Open    , &p::stop_and_open                          >
+            //  +---------+-------------+---------+---------------------+----------------------+
+        > {};
+        // 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;
+        }
+
+
+#ifndef SKIP_DFS
+
+        // transition table is already an incidence list; 
+        // select Edge, Source, Target  =  pair<Start,Event>, Start, Next
+        // making Start part of Edge is necessary because Edge tags have to be unique
+
+        template<typename Row>
+        struct row_to_incidence :
+             mpl::vector<mpl::pair<typename Row::Target, typename Row::Evt>, typename Row::Source, typename Row::Target> {};
+
+        typedef mpl::fold<player_::transition_table,
+                          mpl::vector<>,
+                          mpl::push_back<mpl::_1, row_to_incidence<mpl::_2> > >::type
+                transition_incidence_list;
+            
+        typedef mpl_graph::incidence_list_graph<transition_incidence_list>
+            transition_graph;
+        
+        struct preordering_visitor : mpl_graph::dfs_default_visitor_operations {    
+            template<typename Node, typename Graph, typename State>
+            struct discover_vertex :
+                mpl::push_back<State, Node>
+            {};
+        };
+
+        typedef mpl::first<mpl_graph::
+            depth_first_search<transition_graph, 
+                               preordering_visitor,
+                               mpl::vector<>,
+                               player_::initial_state>::type>::type
+                    dfs_from_initial_state;
+                    
+        BOOST_MPL_ASSERT(( mpl::equal<dfs_from_initial_state, 
+                                      mpl::vector<Empty,Open,Stopped,Playing,Paused> > ));
+                                      
+#endif
+
+
+    };
+    // Pick a back-end
+    typedef msm::back::state_machine<player_> player;
+
+    //
+    // Testing utilities.
+    //
+    static char const* const state_names[] = { "Stopped", "Open", "Empty", "Playing", "Paused" };
+    void pstate(player const& p)
+    {
+        std::cout << " -> " << state_names[p.current_state()[0]] << std::endl;
+    }
+
+
+    void test()
+    {                
+		player p;
+        // needed to start the highest-level SM. This will call on_entry and mark the start of the SM
+        p.start(); 
+        // go to Open, call on_exit on Empty, then action, then on_entry on Open
+        p.process_event(open_close()); pstate(p);
+        p.process_event(open_close()); pstate(p);
+        // will be rejected, wrong disk type
+        p.process_event(
+            cd_detected("louie, louie",DISK_DVD)); pstate(p);
+        p.process_event(
+            cd_detected("louie, louie",DISK_CD)); pstate(p);
+		p.process_event(play());
+
+        // at this point, Play is active      
+        p.process_event(pause()); pstate(p);
+        // go back to Playing
+        p.process_event(end_pause());  pstate(p);
+        p.process_event(pause()); pstate(p);
+        p.process_event(stop());  pstate(p);
+        // event leading to the same state
+        // no action method called as it is not present in the transition table
+        p.process_event(stop());  pstate(p);
+    }
+}
+
+int main()
+{
+    test();
+    return 0;
+}