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    copied!<p>A naive implementation of xml: Node extends a list of itself</p> <pre><code> class Node : public std::unordered_map&lt; std::string, std::list&lt; Node &gt; &gt; { public: Node( const std::string &amp; tag_ ) : tag( tag_ ){} void print( const std::string &amp; indent ) const { std::cout &lt;&lt; indent &lt;&lt; '&lt;' &lt;&lt; tag; if( ! attributes.empty()) { for( std::unordered_map&lt; std::string, std::string &gt;::const_iterator it2 = attributes.begin(); it2 != attributes.end(); ++it2 ) { std::cout &lt;&lt; ' ' &lt;&lt; it2-&gt;first &lt;&lt; "=\"" &lt;&lt; it2-&gt;second &lt;&lt; "\" "; } } std::cout &lt;&lt; '&gt;' &lt;&lt; std::endl; if( ! text.empty()) { std::cout &lt;&lt; indent &lt;&lt; text &lt;&lt; std::endl; } for( Node::const_iterator it1 = begin(); it1 != end(); ++it1 ) { const std::list&lt; Node &gt; &amp; lst = it1-&gt;second; for( std::list&lt; Node &gt;::const_iterator it2 = lst.begin(); it2 != lst.end(); ++it2 ) { (*it2).print( indent + '\t' ); } } std::cout &lt;&lt; indent &lt;&lt; "&lt;/" &lt;&lt; tag &lt;&lt; '&gt;' &lt;&lt; std::endl; } std::string tag; std::string text; std::unordered_map&lt; std::string, std::string &gt; attributes; }; int _tmain(int argc, _TCHAR* argv[]) { Node title( "title" ); title.text = "Title of the html page"; Node head( "head" ); head["title"].push_back( title ); Node html( "html" ); html["head"].push_back( head ); Node body( "body" ); body.attributes["bgcolor"] = "#F0F0F0"; Node p1( "p" ); p1.text = "Creativity and imagination are limitless."; body["p"].push_back( p1 ); Node p2( "p" ); p2.text = "Don't listen to the annoying guys who say your projects are dreams"; body["p"].push_back( p2 ); html["body"].push_back( body ); html.print( "" ); /* Result: &lt;html&gt; &lt;head&gt; &lt;title&gt; Title of the html page &lt;/title&gt; &lt;/head&gt; &lt;body bgcolor="#F0F0F0" &gt; &lt;p&gt; Creativity and imagination are limitless. &lt;/p&gt; &lt;p&gt; Don't listen to the annoying guys who say your projects are dreams &lt;/p&gt; &lt;/body&gt; &lt;/html&gt; */ return 0; } </code></pre> <p>Since no virtual method at all are defined, no need of virtual destructor.</p>
 

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