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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">20.6 Private Inheritance - example
	(cont.)</font></h2>
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<ul>
	<li><tt>Set</tt> method may call <tt>push_back</tt></li>
	<li><tt>push_back</tt> is <i>not</i> part of <tt>Set</tt>'s interface:
		<blockquote><tt>
			Set a_set;<br>
			a_set.add("Sally"); <font color="#0000cc">// legal</font><br>
			a_set.push_back("Fred"); <font color="#ff0000"><br>
				// Error--push_back not part of interface for Set</font>
		</tt></blockquote>
	</li>
	<li>Private inheritance is rarely used</li>
	<li><tt>Set</tt> could've instead had a private <tt>List</tt>
		attribute (<i>aggregation</i>)</li>
	<li>Similarly, <i>protected inheritance</i> exists, but is used even
		less often</li>
</ul>

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