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Re:visitor感觉有点麻烦，不如直接判断？ [Re:emarket]

floater

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于 2004-12-19 02:45

emarket wrote:
如果你的vistable们的结构相对固定，你可以在不改 visitable 代码的基础上，增加visitor, 从而达到 extendable的目的。

This is the key.

For example, when you design a middleware lib, you should keep this in mind so that users of your lib can extend their own functionalities without changing your code(They don't know your code, they don't own your code, or they don't have the commercial right to do so). That means you could have a simple Visitable interface so users could tap into.

"Any fool can write code that a computer can understand. Good programmers write code that humans can understand."
- Martin Fowler, Refactoring - Improving the Design of Existing Code

话题树型展开

人气	标题	作者	字数	发贴时间
11978	visitor感觉有点麻烦，不如直接判断？	jameszhang	54	2004-12-17 16:50
9819	Re:visitor感觉有点麻烦，不如直接判断？	justin_here	28	2004-12-17 20:10
9824	Re:visitor感觉有点麻烦，不如直接判断？	emarket	232	2004-12-17 22:33
9827	Re:visitor感觉有点麻烦，不如直接判断？	jameszhang	62	2004-12-18 08:06
9726	Re:visitor感觉有点麻烦，不如直接判断？	emarket	76	2004-12-18 17:21
9756	Re:visitor感觉有点麻烦，不如直接判断？	floater	487	2004-12-19 02:45
9729	Re:visitor感觉有点麻烦，不如直接判断？	jameszhang	65	2004-12-18 22:31
10787	Re:visitor感觉有点麻烦，不如直接判断？	zyzhang	509	2004-12-20 20:21

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