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📄 [c++对象模型][8]多重继承与虚函数表 - itech's blog - 博客园.htm

📁 最为全面的c++内存模型探秘。不管是初学者还是老手
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style="COLOR: #000000">&nbsp;</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN 
style="COLOR: #800000">B2:</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN 
style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #000000">&lt;&lt;</SPAN><SPAN 
style="COLOR: #000000">&nbsp;pB2&nbsp;</SPAN><SPAN 
style="COLOR: #000000">&lt;&lt;</SPAN><SPAN 
style="COLOR: #000000">&nbsp;endl;<BR>&nbsp;&nbsp;&nbsp;&nbsp;B3&nbsp;</SPAN><SPAN 
style="COLOR: #000000">*</SPAN><SPAN 
style="COLOR: #000000">pB3&nbsp;</SPAN><SPAN 
style="COLOR: #000000">=</SPAN><SPAN 
style="COLOR: #000000">&nbsp;dynamic_cast</SPAN><SPAN 
style="COLOR: #000000">&lt;</SPAN><SPAN style="COLOR: #000000">B3</SPAN><SPAN 
style="COLOR: #000000">*&gt;</SPAN><SPAN 
style="COLOR: #000000">(pB1);<BR>&nbsp;&nbsp;&nbsp;&nbsp;cout&nbsp;</SPAN><SPAN 
style="COLOR: #000000">&lt;&lt;</SPAN><SPAN 
style="COLOR: #000000">&nbsp;</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN 
style="COLOR: #800000">B3:</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN 
style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #000000">&lt;&lt;</SPAN><SPAN 
style="COLOR: #000000">&nbsp;pB3&nbsp;</SPAN><SPAN 
style="COLOR: #000000">&lt;&lt;</SPAN><SPAN 
style="COLOR: #000000">&nbsp;endl;<BR>&nbsp;&nbsp;&nbsp;&nbsp;delete&nbsp;pD;<BR>}</SPAN></SPAN></DIV>
<P>&nbsp;</P>
<P>2）验证代码的运行结果：</P>
<P><IMG 
src="[C++对象模型][8]多重继承与虚函数表 - iTech's Blog - 博客园.files/2009022810164625.png"></P>
<P>&nbsp;</P>
<P>3）总结：</P>
<P><SPAN 
style="COLOR: #ff0000">从多重继承的内存布局，我们可以看到子类新加入的虚函数被加到了第一个基类的虚函数表，所以当dynamic_cast的时候，子类和第一个基类的地址相同，不需要移动指针，但是当dynamic_cast到其他的父类的时候，需要做相应的指针的移动。</SPAN></P>
<P>三 完！</P>
<DIV id=MySignature>
<P>感谢，Thanks！<BR><BR>作者：<A href="http://itech.cnblogs.com/">iTech</A><BR>出处：<A 
href="http://itech.cnblogs.com/">http://itech.cnblogs.com/</A> 
<BR>转载：本文版权归作者iTech所有，转载请注明出处，不得用于商业用途！</P></DIV>
<DIV id=EntryTag>Tag标签: <A 
href="http://www.cnblogs.com/itech/tag/[Cpp对象模型]/">[Cpp对象模型]</A></DIV></DIV>
<DIV class=postDesc>posted @ 2009-02-28 10:21 <A 
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    <TD colSpan=3>该文被作者在 2009-03-01 19:33 编辑过 </TD></TR>
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    <TD colSpan=3><A href="http://a4.yeshj.com/rd/24287/" target=_blank><SPAN 
      style="COLOR: red">IT“暖冬”计划紧急招募中</SPAN></A><BR><SPAN 
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