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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">21.7.2 Replicated Base Classes (cont.)</font></h2>
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<ul>
	<li><tt>TeachingAssistant*</tt> can always be converted to an
		<tt>Employee*</tt>, then to a <tt>Person*</tt></li>
	<li>Without virtual inheritance, a <tt>TeachingAssistant*</tt> can <b>not</b>
		be converted directly to a <tt>Person*</tt>:
		<blockquote><tt>
			TeachingAssistant* fred = new TeachingAssistant();
			<br>Student* s = fred;<font color="#0000cc">
				// Legal, because TeachingAssistant <nobr>is-a</nobr> Student</font>
			<br>Person* p1 = s;
			<br>Employee* e = fred;
			<br>Person* p2 = e;
			<br><font color="#009999">Person* p3 = fred;</font><font color="#0000cc">
				// Legal if virtual inheritance used, otherwise error</font>
		</tt></blockquote>
	</li>
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