slide098.html

来自「《Big C++ 》Third Edition电子书和代码全集-Part1」· HTML 代码 · 共 65 行

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<h2><font color="#009999">More Patterns (cont.)</font></h2>
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<table border='1' cellpadding='4'>
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		<th>Pattern Name</th>
		<th>Description</th>
		<th>Example</th>
	</tr>
	<tr>
		<th>Proxy</th>
		<td>A service needs to be made more versatile without affecting the service
			provider or client</td>
		<td>A proxy class sends client requests to a server object on a different
			computer</td>
	</tr>
	<tr>
		<th>Singleton</th>
		<td>All clients need access to a single shared object of a class</td>
		<td>A random number singleton gives all clients access to the same
			generator</td>
	</tr>
	<tr>
		<th>State</th>
		<td>A separate object is used for each state. State-dependent code is
			distributed over the various state classes</td>
		<td>An image editor has different drawing states. Each state is handled by
			a separate tool object</td>
	</tr>
	<tr>
		<th>Visitor</th>
		<td>A structure with a fixed set of element classes needs an extensible set
			of operations</td>
		<td>An XML visitor visits a tree of XML elements, applying arbitrary
			operations to each node</td>
	</tr>
</table>

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