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1 | // Copyright 2010 Christophe Henry | |
2 | // henry UNDERSCORE christophe AT hotmail DOT com | |
3 | // This is an extended version of the state machine available in the boost::mpl library | |
4 | // Distributed under the same license as the original. | |
5 | // Copyright for the original version: | |
6 | // Copyright 2005 David Abrahams and Aleksey Gurtovoy. Distributed | |
7 | // under the Boost Software License, Version 1.0. (See accompanying | |
8 | // file LICENSE_1_0.txt or copy at | |
9 | // http://www.boost.org/LICENSE_1_0.txt) | |
10 | ||
11 | #include <iostream> | |
12 | // back-end | |
13 | #include <boost/msm/back/state_machine.hpp> | |
14 | ||
15 | //front-end | |
16 | #include <boost/msm/front/state_machine_def.hpp> | |
17 | // functors | |
18 | #include <boost/msm/front/functor_row.hpp> | |
19 | #include <boost/msm/front/euml/common.hpp> | |
20 | ||
21 | ||
22 | using namespace std; | |
23 | namespace msm = boost::msm; | |
24 | namespace mpl = boost::mpl; | |
25 | using namespace msm::front; | |
26 | ||
27 | namespace // Concrete FSM implementation | |
28 | { | |
29 | // events | |
30 | struct disconnect {}; | |
31 | struct connect {}; | |
32 | ||
33 | // flag | |
34 | struct is_connected{}; | |
35 | // front-end: define the FSM structure | |
36 | struct Connection_ : public msm::front::state_machine_def<Connection_> | |
37 | { | |
38 | // when a transition is about to be taken, we already update our currently active state(s) | |
39 | typedef msm::active_state_switch_before_transition active_state_switch_policy; | |
40 | ||
41 | // The list of FSM states | |
42 | struct Connected : public msm::front::state<> | |
43 | { | |
44 | // in this state, we are connected | |
45 | typedef mpl::vector1<is_connected> flag_list; | |
46 | template <class Event,class FSM> | |
47 | void on_entry(Event const&,FSM& ) {std::cout << "entering: Connected" << std::endl;} | |
48 | template <class Event,class FSM> | |
49 | void on_exit(Event const&,FSM& ) {std::cout << "leaving: Connected" << std::endl;} | |
50 | }; | |
51 | struct Disconnected : public msm::front::state<> | |
52 | { | |
53 | template <class Event,class FSM> | |
54 | void on_entry(Event const& ,FSM&) {std::cout << "entering: Disconnected" << std::endl;} | |
55 | template <class Event,class FSM> | |
56 | void on_exit(Event const&,FSM& ) {std::cout << "leaving: Disconnected" << std::endl;} | |
57 | }; | |
58 | ||
59 | // transition actions | |
60 | struct SignalConnect | |
61 | { | |
62 | template <class EVT,class FSM,class SourceState,class TargetState> | |
63 | void operator()(EVT const&, FSM& fsm,SourceState& ,TargetState& ) | |
64 | { | |
65 | // by default, this would be wrong (shows false) | |
66 | cout << "SignalConnect. Connected? " << std::boolalpha << fsm.template is_flag_active<is_connected>() << endl; | |
67 | } | |
68 | }; | |
69 | struct SignalDisconnect | |
70 | { | |
71 | template <class EVT,class FSM,class SourceState,class TargetState> | |
72 | void operator()(EVT const&, FSM& fsm,SourceState& ,TargetState& ) | |
73 | { | |
74 | // by default, this would be wrong (shows true) | |
75 | cout << "SignalDisconnect. Connected? " << std::boolalpha << fsm.template is_flag_active<is_connected>() << endl; | |
76 | } | |
77 | }; | |
78 | ||
79 | // the initial state of the player SM. Must be defined | |
80 | typedef Disconnected initial_state; | |
81 | ||
82 | // Transition table for player | |
83 | struct transition_table : mpl::vector< | |
84 | // Start Event Next Action Guard | |
85 | // +--------------+-------------+--------------+---------------------------+----------------------+ | |
86 | Row < Connected , disconnect , Disconnected , SignalDisconnect , none >, | |
87 | Row < Disconnected , connect , Connected , SignalConnect , none > | |
88 | // +--------------+-------------+--------------+---------------------------+----------------------+ | |
89 | > {}; | |
90 | // Replaces the default no-transition response. | |
91 | template <class FSM,class Event> | |
92 | void no_transition(Event const& e, FSM&,int state) | |
93 | { | |
94 | std::cout << "no transition from state " << state | |
95 | << " on event " << typeid(e).name() << std::endl; | |
96 | } | |
97 | }; | |
98 | // Pick a back-end | |
99 | typedef msm::back::state_machine<Connection_> Connection; | |
100 | ||
101 | ||
102 | void test() | |
103 | { | |
104 | Connection connection; | |
105 | // needed to start the highest-level SM. This will call on_entry and mark the start of the SM | |
106 | connection.start(); | |
107 | // signal a connection | |
108 | connection.process_event(connect()); | |
109 | // signal a disconnection | |
110 | connection.process_event(disconnect()); | |
111 | connection.stop(); | |
112 | } | |
113 | } | |
114 | ||
115 | int main() | |
116 | { | |
117 | test(); | |
118 | return 0; | |
119 | } |