1 | // Copyright 2016 BogumiĆ Chojnowski |
2 | // bogumil DOT chojnowski AT gmail DOT com |
3 | // This is 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 2010 Christophe Henry |
7 | // henry UNDERSCORE christophe AT hotmail DOT com |
8 | // This is an extended version of the state machine available in the boost::mpl library |
9 | // Distributed under the same license as the original. |
10 | // Copyright for the original version: |
11 | // Copyright 2005 David Abrahams and Aleksey Gurtovoy. Distributed |
12 | // under the Boost Software License, Version 1.0. (See accompanying |
13 | // file LICENSE_1_0.txt or copy at |
14 | // http://www.boost.org/LICENSE_1_0.txt) |
15 | |
16 | #include <memory> |
17 | // back-end |
18 | #include <boost/msm/back/state_machine.hpp> |
19 | //front-end |
20 | #include <boost/msm/front/state_machine_def.hpp> |
21 | #ifndef BOOST_MSM_NONSTANDALONE_TEST |
22 | #define BOOST_TEST_MODULE MyTest |
23 | #endif |
24 | #include <boost/test/unit_test.hpp> |
25 | |
26 | namespace msm = boost::msm; |
27 | namespace mpl = boost::mpl; |
28 | |
29 | |
30 | namespace |
31 | { |
32 | struct Lightbulp |
33 | { |
34 | Lightbulp(int c) : current(c) {} |
35 | int current; |
36 | }; |
37 | |
38 | // events |
39 | struct ev_toggle {}; |
40 | |
41 | // front-end: define the FSM structure |
42 | struct bistable_switch_ : public msm::front::state_machine_def<bistable_switch_> |
43 | { |
44 | bistable_switch_(std::unique_ptr<Lightbulp> bulp, int load) |
45 | : bulp_(std::move(bulp)) |
46 | { |
47 | BOOST_CHECK_MESSAGE(bulp_->current == 3, "Wrong current value" ); |
48 | BOOST_CHECK_MESSAGE(load == 5, "Wrong load value" ); |
49 | bulp_->current = 10; |
50 | } |
51 | |
52 | std::unique_ptr<Lightbulp> bulp_; |
53 | |
54 | // The list of FSM states |
55 | struct Off : public msm::front::state<> |
56 | { |
57 | template <typename Event, typename FSM> |
58 | void on_entry(Event const&, FSM& ) { } |
59 | template <typename Event, typename FSM> |
60 | void on_exit(Event const&, FSM&) { } |
61 | }; |
62 | |
63 | struct On : public msm::front::state<> |
64 | { |
65 | template <typename Event, typename FSM> |
66 | void on_entry(Event const&, FSM& ) { } |
67 | template <typename Event, typename FSM> |
68 | void on_exit(Event const&, FSM&) { } |
69 | }; |
70 | |
71 | // the initial state of the player SM. Must be defined |
72 | typedef Off initial_state; |
73 | |
74 | void turn_on(ev_toggle const&) { bulp_->current = 11; } |
75 | void turn_off(ev_toggle const&) { bulp_->current = 9; } |
76 | |
77 | typedef bistable_switch_ bs_; // makes transition table cleaner |
78 | |
79 | // Transition table for player |
80 | struct transition_table : mpl::vector< |
81 | // Start Event Next Action Guard |
82 | // +---------+-------------+---------+---------------------+----------------------+ |
83 | a_row < Off , ev_toggle , On , &bs_::turn_on >, |
84 | a_row < On , ev_toggle , Off , &bs_::turn_off > |
85 | // +---------+-------------+---------+---------------------+----------------------+ |
86 | > {}; |
87 | // Replaces the default no-transition response. |
88 | |
89 | template <typename Event, typename FSM> |
90 | void no_transition(Event const&, FSM&, int) |
91 | { |
92 | BOOST_FAIL("no_transition called!" ); |
93 | } |
94 | }; |
95 | |
96 | // Pick a back-end |
97 | typedef msm::back::state_machine<bistable_switch_> bistable_switch; |
98 | |
99 | BOOST_AUTO_TEST_CASE(my_test) |
100 | { |
101 | auto bulp = std::make_unique<Lightbulp>(args: 3); |
102 | |
103 | bistable_switch bs(std::move(bulp), 5); |
104 | BOOST_CHECK_MESSAGE(bs.bulp_->current == 10, "Wrong returned current value" ); |
105 | |
106 | bs.start(); |
107 | |
108 | bs.process_event(evt: ev_toggle()); |
109 | BOOST_CHECK_MESSAGE(bs.bulp_->current == 11, "Wrong returned current value" ); |
110 | |
111 | bs.process_event(evt: ev_toggle()); |
112 | BOOST_CHECK_MESSAGE(bs.bulp_->current == 9, "Wrong returned current value" ); |
113 | |
114 | bs.stop(); |
115 | } |
116 | } |
117 | |
118 | |