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;
+}