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来自「《Big C++ 》Third Edition电子书和代码全集-Part1」· HTML 代码 · 共 51 行

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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="8">
	<li><tt>Connection</tt> asks the <tt>Telephone</tt> to speak the message
		menu</li>
	<li>User types in "save current message" option</li>
		<ul>
			<li>The <tt>Telephone</tt> passes it on to the <tt>Connection</tt></li>
		</ul>
	</li>
	<li><tt>Connection</tt> tells the <tt>Mailbox</tt> to save current msg
		<ul>
			<li>Modify the responsibilities of <tt>Mailbox</tt> to retrieve, save,
				delete messages)</li>
		</ul>
	</li>
	<li>The <tt>Connection</tt> asks the <tt>Telephone</tt> to speak the
		message menu</li>
</ol>

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