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		<title>冒号论坛 &#187; Tag: c++ - Recent Topics</title>
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		<description>冒号论坛 &raquo; Tag: c++ - Recent Topics</description>
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		<pubDate>Wed, 08 Sep 2010 13:11:56 +0000</pubDate>
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			<title>Todd on "duck typing可以取代继承多态吗？"</title>
			<link>http://bbs.zhenghui.org/topic/duck-typing%e5%8f%af%e4%bb%a5%e5%8f%96%e4%bb%a3%e7%bb%a7%e6%89%bf%e5%a4%9a%e6%80%81%e5%90%97%ef%bc%9f#post-42</link>
			<pubDate>Wed, 10 Feb 2010 21:58:00 +0000</pubDate>
			<dc:creator>Todd</dc:creator>
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			<description>&#60;p&#62;最近看到一位C++高手认为如果C++0x引入了concept(我认为本质上是带静态类型检查的duck typing)就可以不需要继承多态了。我对此持反对意见，我认为继承多态适合于top-down的设计方式；而concept适合于bottom-up的设计方式。二者在设计中都是需要。想听听郑老师的意见。&#60;/p&#62;
&#60;p&#62;&#60;a href=&#34;http://www.cppblog.com/longshanks/archive/2007/12/06/37915.html&#34; rel=&#34;nofollow&#34;&#62;http://www.cppblog.com/longshanks/archive/2007/12/06/37915.html&#60;/a&#62;
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