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📁 《Big C++ 》Third Edition电子书和代码全集-Part1

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<h2><font color="#009999">25.6.4 UML Sequence and State Diagrams (cont.)
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<h3><b>Leave a Message</b> sequence diagram</h3>

<ol>
	<li>Caller keys in extension (shown as single call to <tt>dial</tt>)</li>
	<li><tt>Connection</tt> calls system's <tt>find_mailbox</tt></li>
	<li>The <tt>Mailbox</tt> object on the right is returned</li>
	<li>Connection invokes <tt>get_greeting</tt><br>
		(greeting is passive; doesn't appear on diagram)</li>
	<li>Connection plays appropriate greeting</li>
	<li>Telephone reads msg from user, passes it to connection</li>
	<li>Telephone reads hangup, passes it to connection</li>
	<li>Connection constructs <tt>Message</tt>, adds it to mailbox</li>
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