slide097.html

来自「《Big C++ 》Third Edition电子书和代码全集-Part1」· HTML 代码 · 共 59 行

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<h2><font color="#009999">More Patterns (cont.)</font></h2>
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<table border='1' cellpadding='4'>
	<tr bgcolor='#00ffff'>
		<th>Pattern Name</th>
		<th>Description</th>
		<th>Example</th>
	</tr>
	<tr>
		<th>Mediator</th>
		<td>An object encapsulates the interaction of other objects</td>
		<td>All components in a dialog box notify a mediator of state changes. The
			mediator updates affected components</td>
	</tr>
	<tr>
		<th>Memento</th>
		<td>An object yields an opaque snapshot of a part of its state, and can
			later return its state from that snapshot</td>
		<td>An undo mechanism requests a memento from an object before mutating it.
			If the operation is undone, the memento is used to roll the object back
			to its old state</td>
	</tr>
	<tr>
		<th>Observer</th>
		<td>An object wants to be notified when another object generates an
			event</td>
		<td>User interface components generate events, such as button clicks and
			text changes. A dialog box observes the events and repaints its
			contents</td>
	</tr>
</table>
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