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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">25.6.2 CRC Cards for the Voice Mail System (cont.)
	</font></h2>
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<h3><b>Retrieve Messages</b> use case (cont.)</h3>

<ol start="4">
	<li>User chooses "retrieve msgs" option
		<ul>
			<li><tt>Telephone</tt> passes it on to <tt>Connection</tt></li>
		</ul>
	</li>
	<li><tt>Connection</tt> asks <tt>Telephone</tt> to speak msg menu</li>
	<li>User types in the "listen to current message" option
		<ul>
			<li><tt>Telephone</tt> passes it on to the <tt>Connection</tt></li>
		</ul>
	</li>
	<li><tt>Connection</tt> gets first <tt>Message</tt> from current
		<tt>Mailbox</tt>
		<ul>
			<li>sends its contents to the <tt>Telephone</tt></li>
			<li>Add "retrieve messages" responsibility to Mailbox)</li>
		</ul>
	</li>
</ol>

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