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<H1 class=postTitle><A class=postTitle2 id=AjaxHolder_ctl01_TitleUrl 
href="http://www.cnblogs.com/itech/archive/2009/03/01/1398230.html">[C++对象模型][10]类型转化</A> 
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<P>&nbsp;</P>
<P>一 typeid与dynamic_cast</P>
<P>1）RTTI, Runtime Type Identification (RTTI) or Run-time type information 
(RTTI)，表示在运行时动态决定变量的类型，来调用正确的虚函数。 RTTI在VS2008中默认为关闭，可以通过修改编译选项Enable Run-Time 
Type Info 为 Yes，来启用RTTI，只有当启动RTTI时，用来RTTI功能的typeid和dynamic_cast才能正常工作。</P>
<P>2）type_info，用来描述类型信息。type_info存储了它所描述的类型的名字。RTTI就是使用type_info来实现的。type_info的定义如下：</P>
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id=Code_Closed_Text_135619>Code</SPAN><SPAN id=Code_Open_Text_135619><BR><!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />--><SPAN 
style="COLOR: #0000ff">class</SPAN><SPAN 
style="COLOR: #000000">&nbsp;type_info&nbsp;{<BR></SPAN><SPAN 
style="COLOR: #0000ff">public</SPAN><SPAN 
style="COLOR: #000000">:<BR>&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">virtual</SPAN><SPAN 
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style="COLOR: #0000ff">bool</SPAN><SPAN 
style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">operator</SPAN><SPAN 
style="COLOR: #000000">==</SPAN><SPAN style="COLOR: #000000">&nbsp;(</SPAN><SPAN 
style="COLOR: #0000ff">const</SPAN><SPAN 
style="COLOR: #000000">&nbsp;type_info</SPAN><SPAN 
style="COLOR: #000000">&amp;</SPAN><SPAN 
style="COLOR: #000000">&nbsp;rhs)&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">const</SPAN><SPAN 
style="COLOR: #000000">;<BR>&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">bool</SPAN><SPAN 
style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">operator</SPAN><SPAN 
style="COLOR: #000000">!=</SPAN><SPAN style="COLOR: #000000">&nbsp;(</SPAN><SPAN 
style="COLOR: #0000ff">const</SPAN><SPAN 
style="COLOR: #000000">&nbsp;type_info</SPAN><SPAN 
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style="COLOR: #000000">&nbsp;rhs)&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">const</SPAN><SPAN 
style="COLOR: #000000">;<BR>&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">bool</SPAN><SPAN 
style="COLOR: #000000">&nbsp;before&nbsp;(</SPAN><SPAN 
style="COLOR: #0000ff">const</SPAN><SPAN 
style="COLOR: #000000">&nbsp;type_info</SPAN><SPAN 
style="COLOR: #000000">&amp;</SPAN><SPAN 
style="COLOR: #000000">&nbsp;rhs)&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">const</SPAN><SPAN 
style="COLOR: #000000">;<BR>&nbsp;&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">const</SPAN><SPAN 
style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">char</SPAN><SPAN style="COLOR: #000000">*</SPAN><SPAN 
style="COLOR: #000000">&nbsp;name()&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">const</SPAN><SPAN 
style="COLOR: #000000">;<BR></SPAN><SPAN 
style="COLOR: #0000ff">private</SPAN><SPAN 
style="COLOR: #000000">:<BR>&nbsp;&nbsp;type_info&nbsp;(</SPAN><SPAN 
style="COLOR: #0000ff">const</SPAN><SPAN 
style="COLOR: #000000">&nbsp;type_info</SPAN><SPAN 
style="COLOR: #000000">&amp;</SPAN><SPAN 
style="COLOR: #000000">&nbsp;rhs);<BR>&nbsp;&nbsp;type_info</SPAN><SPAN 
style="COLOR: #000000">&amp;</SPAN><SPAN 
style="COLOR: #000000">&nbsp;</SPAN><SPAN 
style="COLOR: #0000ff">operator</SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN 
style="COLOR: #000000">&nbsp;(</SPAN><SPAN 
style="COLOR: #0000ff">const</SPAN><SPAN 
style="COLOR: #000000">&nbsp;type_info</SPAN><SPAN 
style="COLOR: #000000">&amp;</SPAN><SPAN
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