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10
11  <title>The Boost Statechart Library - Definitions</title>
12</head>
13
14<body link="#0000FF" vlink="#800080">
15  <table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
16  "header">
17    <tr>
18      <td valign="top" width="300">
19        <h3><a href="../../../index.htm"><img alt="C++ Boost" src=
20        "../../../boost.png" border="0" width="277" height="86"></a></h3>
21      </td>
22
23      <td valign="top">
24        <h1 align="center">The Boost Statechart Library</h1>
25
26        <h2 align="center">UML to Boost.Statechart mapping summary</h2>
27      </td>
28    </tr>
29  </table>
30  <hr>
31
32  <h2>Contents</h2>
33
34  <dl class="page-index">
35    <dt><a href="#StateMachine">State machine</a></dt>
36
37    <dt><a href="#States">States</a></dt>
38
39    <dd><a href="#NormalState">Normal state</a></dd>
40
41    <dd><a href="#InitialPseudostate">Initial pseudostate</a></dd>
42
43    <dd><a href="#FinalPseudostate">Final pseudostate</a></dd>
44
45    <dd><a href="#ShallowHistoryPseudostate">Shallow history
46    pseudostate</a></dd>
47
48    <dd><a href="#DeepHistoryPseudostate">Deep history pseudostate</a></dd>
49
50    <dd><a href="#JunctionPoint">Junction point</a></dd>
51
52    <dd><a href="#DynamicChoicePoint">Dynamic choice point</a></dd>
53
54    <dd><a href="#JoinAndForkBars">Join and fork bars</a></dd>
55
56    <dt><a href="#Events">Events</a></dt>
57
58    <dd><a href="#CallEvent">Call event</a></dd>
59
60    <dd><a href="#SignalEvent">Signal event</a></dd>
61
62    <dd><a href="#TimeEvent">Time event</a></dd>
63
64    <dd><a href="#ChangeEvent">Change event</a></dd>
65
66    <dt><a href="#Reactions">Reactions</a></dt>
67
68    <dd><a href="#Guard">Guard</a></dd>
69
70    <dd><a href="#Transition">Transition</a></dd>
71
72    <dd><a href="#Deferral">Deferral</a></dd>
73
74    <dd><a href="#InternalTransition">Internal transition (in-state
75    reaction)</a></dd>
76
77    <dt><a href="#Actions">Actions</a></dt>
78
79    <dd><a href="#EntryAction">Entry action</a></dd>
80
81    <dd><a href="#ExitAction">Exit action</a></dd>
82
83    <dd><a href="#TransitionAction">Transition action</a></dd>
84
85    <dd><a href="#DoActivity">Do activity</a></dd>
86  </dl>
87  <hr>
88
89  <h2><a name="StateMachine" id="StateMachine">State machine</a></h2>
90
91  <ul>
92    <li>A state machine is defined by deriving a class from either the
93    <code><a href=
94    "reference.html#ClassTemplatestate_machine">state_machine</a></code> or
95    the <code><a href=
96    "reference.html#ClassTemplateasynchronous_state_machine">asynchronous_state_machine</a></code>
97    class templates; <a href=
98    "tutorial.html#DefiningStatesAndEvents">example</a></li>
99  </ul>
100
101  <h2><a name="States" id="States">States</a></h2>
102
103  <h3><a name="NormalState" id="NormalState">Normal state</a></h3>
104
105  <ul>
106    <li>A state is defined by deriving a class from either the <code><a href=
107    "reference.html#ClassTemplatesimple_state">simple_state</a></code> or
108    <code><a href="reference.html#ClassTemplatestate">state</a></code> class
109    templates; <a href=
110    "tutorial.html#DefiningStatesAndEvents">example</a></li>
111
112    <li>The position of a state in the state hierarchy is defined by what is
113    passed as the <code>Context</code> template parameter. <a href=
114    "definitions.html#OutermostState">Outermost states</a> pass the
115    <code><a href=
116    "reference.html#ClassTemplatestate_machine">state_machine&lt;&gt;</a></code>
117    or <code><a href=
118    "reference.html#ClassTemplateasynchronous_state_machine">asynchronous_state_machine&lt;&gt;</a></code>
119    subtype they belong to, inner states pass their direct outer state;
120    <a href="tutorial.html#DefiningStatesAndEvents">example</a></li>
121
122    <li>A state can be made a member of a particular orthogonal region by
123    passing an instantiation of the <code>orthogonal</code> class template
124    nested in its outer state; <a href=
125    "tutorial.html#OrthogonalStates">example</a></li>
126  </ul>
127
128  <h3><a name="InitialPseudostate" id="InitialPseudostate">Initial
129  pseudostate</a></h3>
130
131  <ul>
132    <li>The state that is initially entered is identified by template
133    parameters rather than by a default transition from the initial
134    pseudostate (there is no such thing in Boost.Statechart)</li>
135
136    <li>For <code><a href=
137    "reference.html#ClassTemplatestate_machine">state_machine&lt;&gt;</a></code>
138    and <code><a href=
139    "reference.html#ClassTemplateasynchronous_state_machine">asynchronous_state_machine&lt;&gt;</a></code>
140    the state that is initially entered needs to be specified with the
141    <code>InitialState</code> template parameter; <a href=
142    "tutorial.html#DefiningStatesAndEvents">example</a></li>
143
144    <li>For <code><a href=
145    "reference.html#ClassTemplatesimple_state">simple_state&lt;&gt;</a></code>
146    and <code><a href=
147    "reference.html#ClassTemplatestate">state&lt;&gt;</a></code> the inner
148    state(s) that is/are initially entered can be specified with the
149    <code>InnerInitial</code> template parameter; <a href=
150    "tutorial.html#DefiningStatesAndEvents">example</a></li>
151  </ul>
152
153  <h3><a name="FinalPseudostate" id="FinalPseudostate">Final
154  pseudostate</a></h3>
155
156  <ul>
157    <li>There is no such thing as a final pseudostate in
158    Boost.Statechart</li>
159
160    <li>This functionality is implemented with a special reaction
161    (<code><a href=
162    "reference.html#ClassTemplatetermination">termination&lt;&gt;</a></code>)
163    and special reaction function (<code><a href=
164    "reference.html#simple_state::terminate">simple_state&lt;&gt;::terminate()</a></code>);
165    <a href="tutorial.html#StateQueries">example</a></li>
166  </ul>
167
168  <h3><a name="ShallowHistoryPseudostate" id=
169  "ShallowHistoryPseudostate">Shallow history pseudostate</a></h3>
170
171  <ul>
172    <li>A shallow history transition target or shallow history inner initial
173    state can be specified with <code><a href=
174    "reference.html#ClassTemplateshallow_history">shallow_history&lt;&gt;</a></code></li>
175  </ul>
176
177  <h3><a name="DeepHistoryPseudostate" id="DeepHistoryPseudostate">Deep
178  history pseudostate</a></h3>
179
180  <ul>
181    <li>A deep history transition target or deep history inner initial state
182    can be specified with <code><a href=
183    "reference.html#ClassTemplatedeep_history">deep_history&lt;&gt;</a></code>;
184    <a href="tutorial.html#History">example</a></li>
185  </ul>
186
187  <h3><a name="JunctionPoint" id="JunctionPoint">Junction point</a></h3>
188
189  <ul>
190    <li>Does not exist in Boost.Statechart; <a href=
191    "rationale.html#Limitations">rationale</a></li>
192  </ul>
193
194  <h3><a name="DynamicChoicePoint" id="DynamicChoicePoint">Dynamic choice
195  point</a></h3>
196
197  <ul>
198    <li>Does not (yet?) exist in Boost.Statechart; <a href=
199    "rationale.html#Limitations">rationale</a></li>
200  </ul>
201
202  <h3><a name="JoinAndForkBars" id="JoinAndForkBars">Join and fork
203  bars</a></h3>
204
205  <ul>
206    <li>Do not exist in Boost.Statechart; <a href=
207    "rationale.html#Limitations">rationale</a></li>
208  </ul>
209
210  <h2><a name="Events" id="Events">Events</a></h2>
211
212  <ul>
213    <li>A event is defined by deriving a class from the <a href=
214    "reference.html#ClassTemplateevent"><code>event</code></a> class
215    template; <a href=
216    "tutorial.html#DefiningStatesAndEvents">example</a></li>
217
218    <li>There is no distinction between signal and call events, see
219    below</li>
220  </ul>
221
222  <h3><a name="CallEvent" id="CallEvent">Call event</a></h3>
223
224  <ul>
225    <li>All events passed to <code><a href=
226    "reference.html#process_event">state_machine&lt;&gt;::process_event()</a></code>
227    are implicitly call events</li>
228  </ul>
229
230  <h3><a name="SignalEvent" id="SignalEvent">Signal event</a></h3>
231
232  <ul>
233    <li>All events passed to either <code><a href=
234    "reference.html#post_event0">simple_state&lt;&gt;::post_event()</a></code>
235    or <code><a href=
236    "reference.html#queue_event">fifo_scheduler&lt;&gt;::queue_event()</a></code>
237    are implicitly signal events</li>
238  </ul>
239
240  <h3><a name="TimeEvent" id="TimeEvent">Time event</a></h3>
241
242  <ul>
243    <li>Does not exist in Boost.Statechart</li>
244
245    <li>A time event can be simulated with an external timer that is started
246    in the entry action and stopped in the exit action of a particular state.
247    When starting the timer, it is instructed to call <code><a href=
248    "reference.html#queue_event">fifo_scheduler&lt;&gt;::queue_event()</a></code>
249    when the due time elapses</li>
250  </ul>
251
252  <h3><a name="ChangeEvent" id="ChangeEvent">Change event</a></h3>
253
254  <ul>
255    <li>Does not exist in Boost.Statechart</li>
256
257    <li>A change event can be simulated by packing to be monitored variables
258    into an external wrapper with <code>get</code> and <code>set</code>
259    methods. Whenever <code>set</code> is called the wrapper posts an
260    appropriate event</li>
261  </ul>
262
263  <h2><a name="Reactions" id="Reactions">Reactions</a></h2>
264
265  <h3><a name="Guard" id="Guard">Guard</a></h3>
266
267  <ul>
268    <li>A guard can be implemented with a selection statement in a
269    <code><a href=
270    "reference.html#ClassTemplatecustom_reaction">custom_reaction&lt;&gt;</a></code>;
271    <a href="tutorial.html#Guards">example</a></li>
272  </ul>
273
274  <h3><a name="Transition" id="Transition">Transition</a></h3>
275
276  <ul>
277    <li>A transition can be defined with either a <code><a href=
278    "reference.html#ClassTemplatetransition">transition&lt;&gt;</a></code> or
279    a call to <code><a href=
280    "reference.html#transit1">simple_state&lt;&gt;::transit&lt;&gt;</a></code>
281    in a <code><a href=
282    "reference.html#ClassTemplatecustom_reaction">custom_reaction&lt;&gt;</a></code>;
283    <a href="tutorial.html#AddingReactions">example</a></li>
284  </ul>
285
286  <h3><a name="Deferral" id="Deferral">Deferral</a></h3>
287
288  <ul>
289    <li>A deferral reaction can be defined with either a <code><a href=
290    "reference.html#ClassTemplatedeferral">deferral&lt;&gt;</a></code> or a
291    call to <code><a href=
292    "reference.html#defer_event">simple_state&lt;&gt;::defer_event()</a></code>
293    in a <code><a href=
294    "reference.html#ClassTemplatecustom_reaction">custom_reaction&lt;&gt;</a></code>;
295    <a href="tutorial.html#DeferringEvents">example</a></li>
296  </ul>
297
298  <h3><a name="InternalTransition" id="InternalTransition">Internal
299  transition (in-state reaction)</a></h3>
300
301  <ul>
302    <li>An in-state reaction can be defined with either a <code><a href=
303    "reference.html#ClassTemplatein_state_reaction">in_state_reaction&lt;&gt;</a></code>
304    or a call to <a href=
305    "reference.html#discard_event"><code>simple_state&lt;&gt;::discard_event()</code></a>
306    in a <code><a href=
307    "reference.html#ClassTemplatecustom_reaction">custom_reaction&lt;&gt;</a></code></li>
308  </ul>
309
310  <h2><a name="Actions" id="Actions">Actions</a></h2>
311
312  <h3><a name="EntryAction" id="EntryAction">Entry action</a></h3>
313
314  <ul>
315    <li>A state entry action can be defined by adding a constructor to a
316    state class; <a href="tutorial.html#HelloWorld">example</a></li>
317  </ul>
318
319  <h3><a name="ExitAction" id="ExitAction">Exit action</a></h3>
320
321  <ul>
322    <li>A state exit action can be defined by adding a destructor to a state
323    class; <a href="tutorial.html#HelloWorld">example</a></li>
324  </ul>
325
326  <h3><a name="TransitionAction" id="TransitionAction">Transition
327  action</a></h3>
328
329  <ul>
330    <li>A transition action can be defined by passing a function pointer
331    referencing the action to either <code><a href=
332    "reference.html#ClassTemplatetransition">transition&lt;&gt;</a></code> or
333    <code><a href=
334    "reference.html#transit2">simple_state&lt;&gt;::transit&lt;&gt;()</a></code>;
335    <a href="tutorial.html#TransitionActions">example</a></li>
336  </ul>
337
338  <h3><a name="DoActivity" id="DoActivity">Do activity</a></h3>
339
340  <ul>
341    <li>Not supported in Boost.Statechart</li>
342
343    <li>A do activity can be simulated with a separate thread that is started
344    in the entry action and cancelled (!) in the exit action of a particular
345    state</li>
346  </ul>
347  <hr>
348
349  <p><a href="http://validator.w3.org/check?uri=referer"><img border="0" src=
350  "http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01 Transitional"
351  height="31" width="88"></a></p>
352
353  <p>Revised
354  <!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->03 December, 2006<!--webbot bot="Timestamp" endspan i-checksum="38512" --></p>
355
356  <p><i>Copyright &copy; 2003-<!--webbot bot="Timestamp" s-type="EDITED" s-format="%Y" startspan -->2006<!--webbot bot="Timestamp" endspan i-checksum="770" -->
357  <a href="contact.html">Andreas Huber D&ouml;nni</a></i></p>
358
359  <p><i>Distributed under the Boost Software License, Version 1.0. (See
360  accompanying file <a href="../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
361  copy at <a href=
362  "http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p>
363</body>
364</html>
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