今天在网上看到网页叫“Object Orientation Isa Hoax”——面向对象是一个骗局,标题很有煽动性(注:该网站上还有一个网页叫Object Orientation Is Dead),好吧,打开看看上面有些 什么,发现这个网页是在收集一些关于“面向对象的反动言论”,没想到的是,很多言论出自很多大师之口。比如:Alexander Stepanov和Bjarne Stroustrup。这些言论挺有意思的,所以,我摘两段在下面:
Question:
I think STL and Generic Programming mark a definite departure from the common C++ programming style, which I find is almost completely derived from SmallTalk. Do you agree?
Answer:
Yes. STL is not object oriented. I think that object orientedness is almost as much of a hoax as Artificial Intelligence. I have yet to see an interesting piece of code that comes from these OO people. In a sense, I am unfair to AI: I learned a lot of stuff from the MIT AI Lab crowd, they have done some really fundamental work: Bill Gosper’s Hakmem is one of the best things for a programmer to read. AI might not have had a serious foundation, but it produced Gosper and Stallman (Emacs), Moses (Macsyma) and Sussman (Scheme, together with Guy Steele). I find OOP technically unsound. It attempts to decompose the world in terms of interfaces that vary on a single type. To deal with the real problems you need multisorted algebras – families of interfaces that span multiple types. I find OOP philosophically unsound. It claims that everything is an object. Even if it is true it is not very interesting – saying that everything is an object is saying nothing at all. I find OOP methodologically wrong. It starts with classes. It is as if mathematicians would start with axioms. You do not start with axioms – you start with proofs. Only when you have found a bunch of related proofs, can you come up with axioms. You end with axioms. The same thing is true in programming: you have to start with interesting algorithms. Only when you understand them well, can you come up with an interface that will let them work.
首先,是 Windows API 和 DLL Hell。(译注:DLL Hell——DLL灾难,就是微软的DLL升级时因为不同版本可能造成应用程序无法运行的灾难,首当其冲的是COM编程,相信大家都知道某些木马或是病毒更改了一些系统的DLL可以导致整个Windows不举,这就是DLL Hell) 于是,第一次革命是DDE——我们可以创建一个状态条在上面显示Microsoft的股票价格(译注:Dynamic Data Exchange,工作原理是: 甲方申请一块全局内存,然后把内存指针postmessage到乙方,乙方根据收到的指针访问那块全局内存)。
为了解决这个问题,他们创造了OLE(很像DDE,只是名字不一样),而且,我还记得在一次 Microsoft 大会上,某个微软的演讲者正式宣布—— Windows API 马上就会被 OLE API 所重写并取代,我还盲目地相信了这一说法。而且,所有的在图形界面的控件都会是OCX,那是OLE引入的接口,同样,其目的是为了消除DLL Hell。相信大家都记得,那个时候,我们是怎么地梦想着有一天,我们的应用程序(当然是非常大的程序)可以完全地被嵌入到Word文档中。