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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 | //front-end | |
15 | #include <boost/msm/front/state_machine_def.hpp> | |
16 | // functors | |
17 | #include <boost/msm/front/functor_row.hpp> | |
18 | #include <boost/msm/front/euml/common.hpp> | |
19 | ||
20 | namespace msm = boost::msm; | |
21 | namespace mpl = boost::mpl; | |
22 | using namespace boost::msm::front; | |
23 | ||
24 | namespace | |
25 | { | |
26 | // events | |
27 | struct event1 {}; | |
28 | ||
29 | ||
30 | // front-end: define the FSM structure | |
31 | struct my_machine_ : public msm::front::state_machine_def<my_machine_> | |
32 | { | |
33 | // The list of FSM states | |
34 | struct State1 : public msm::front::state<> | |
35 | { | |
36 | // every (optional) entry/exit methods get the event passed. | |
37 | template <class Event,class FSM> | |
38 | void on_entry(Event const&,FSM& ) {std::cout << "entering: State1" << std::endl;} | |
39 | template <class Event,class FSM> | |
40 | void on_exit(Event const&,FSM& ) {std::cout << "leaving: State1" << std::endl;} | |
41 | }; | |
42 | struct State2 : public msm::front::state<> | |
43 | { | |
44 | template <class Event,class FSM> | |
45 | void on_entry(Event const& ,FSM&) {std::cout << "entering: State2" << std::endl;} | |
46 | template <class Event,class FSM> | |
47 | void on_exit(Event const&,FSM& ) {std::cout << "leaving: State2" << std::endl;} | |
48 | }; | |
49 | ||
50 | struct State3 : public msm::front::state<> | |
51 | { | |
52 | // when stopped, the CD is loaded | |
53 | template <class Event,class FSM> | |
54 | void on_entry(Event const& ,FSM&) {std::cout << "entering: State3" << std::endl;} | |
55 | template <class Event,class FSM> | |
56 | void on_exit(Event const&,FSM& ) {std::cout << "leaving: State3" << std::endl;} | |
57 | }; | |
58 | ||
59 | struct State4 : public msm::front::state<> | |
60 | { | |
61 | template <class Event,class FSM> | |
62 | void on_entry(Event const&,FSM& ) {std::cout << "entering: State4" << std::endl;} | |
63 | template <class Event,class FSM> | |
64 | void on_exit(Event const&,FSM& ) {std::cout << "leaving: State4" << std::endl;} | |
65 | }; | |
66 | ||
67 | // the initial state of the player SM. Must be defined | |
68 | typedef State1 initial_state; | |
69 | ||
70 | // transition actions | |
71 | struct State2ToState3 | |
72 | { | |
73 | template <class EVT,class FSM,class SourceState,class TargetState> | |
74 | void operator()(EVT const& ,FSM& ,SourceState& ,TargetState& ) | |
75 | { | |
76 | std::cout << "my_machine::State2ToState3" << std::endl; | |
77 | } | |
78 | }; | |
79 | struct State3ToState4 | |
80 | { | |
81 | template <class EVT,class FSM,class SourceState,class TargetState> | |
82 | void operator()(EVT const& ,FSM& ,SourceState& ,TargetState& ) | |
83 | { | |
84 | std::cout << "my_machine::State3ToState4" << std::endl; | |
85 | } | |
86 | }; | |
87 | // guard conditions | |
88 | struct always_true | |
89 | { | |
90 | template <class EVT,class FSM,class SourceState,class TargetState> | |
91 | bool operator()(EVT const& evt,FSM& fsm,SourceState& src,TargetState& tgt) | |
92 | { | |
93 | std::cout << "always_true" << std::endl; | |
94 | return true; | |
95 | } | |
96 | }; | |
97 | struct always_false | |
98 | { | |
99 | template <class EVT,class FSM,class SourceState,class TargetState> | |
100 | bool operator()(EVT const& evt,FSM& fsm,SourceState& src,TargetState& tgt) | |
101 | { | |
102 | std::cout << "always_false" << std::endl; | |
103 | return true; | |
104 | } | |
105 | }; | |
106 | ||
107 | typedef my_machine_ p; // makes transition table cleaner | |
108 | ||
109 | // Transition table for player | |
110 | struct transition_table : mpl::vector< | |
111 | // Start Event Next Action Guard | |
112 | // +---------+-------------+---------+---------------------+----------------------+ | |
113 | Row < State1 , none , State2 >, | |
114 | Row < State2 , none , State3 , State2ToState3 >, | |
115 | Row < State3 , none , State4 , none , always_false >, | |
116 | // +---------+-------------+---------+---------------------+----------------------+ | |
117 | Row < State3 , none , State4 , State3ToState4 , always_true >, | |
118 | Row < State4 , event1 , State1 > | |
119 | // +---------+-------------+---------+---------------------+----------------------+ | |
120 | > {}; | |
121 | // Replaces the default no-transition response. | |
122 | template <class FSM,class Event> | |
123 | void no_transition(Event const& e, FSM&,int state) | |
124 | { | |
125 | std::cout << "no transition from state " << state | |
126 | << " on event " << typeid(e).name() << std::endl; | |
127 | } | |
128 | }; | |
129 | // Pick a back-end | |
130 | typedef msm::back::state_machine<my_machine_> my_machine; | |
131 | ||
132 | // | |
133 | // Testing utilities. | |
134 | // | |
135 | static char const* const state_names[] = { "State1", "State2", "State3", "State4" }; | |
136 | void pstate(my_machine const& p) | |
137 | { | |
138 | std::cout << " -> " << state_names[p.current_state()[0]] << std::endl; | |
139 | } | |
140 | ||
141 | void test() | |
142 | { | |
143 | my_machine p; | |
144 | ||
145 | // needed to start the highest-level SM. This will call on_entry and mark the start of the SM | |
146 | // in this case it will also immediately trigger all anonymous transitions | |
147 | p.start(); | |
148 | // this event will bring us back to the initial state and thus, a new "loop" will be started | |
149 | p.process_event(event1()); | |
150 | ||
151 | } | |
152 | } | |
153 | ||
154 | int main() | |
155 | { | |
156 | test(); | |
157 | return 0; | |
158 | } |