Runtime type checking is great (2023)

· · 来源:dev导报

Craig Duggan,BBC Wales

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要知道,早在2025年第三季度,瑞幸的盈利能力就已亮起黄灯。彼时,其总净收入同比增长50.2%,但营业利润仅增长12.9%,营业利润率从去年同期的15.5%下滑至11.6% 。低价策略虽然在短期内带来了海量用户和海量订单,但也如同一台巨大的“碎钞机”,吞噬着企业的利润。

To put all this in the right context, let’s zoom in on the copyright's actual perimeters: the law says you must not copy “protected expressions”. In the case of the software, a protected expression is the code as it is, with the same structure, variables, functions, exact mechanics of how specific things are done, unless they are known algorithms (standard quicksort or a binary search can be implemented in a very similar way and they will not be a violation). The problem is when the business logic of the programs matches perfectly, almost line by line, the original implementation. Otherwise, the copy is lawful and must not obey the original license, as long as it is pretty clear that the code is doing something similar but with code that is not cut & pasted or mechanically translated to some other language, or aesthetically modified just to look a bit different (look: this is exactly the kind of bad-faith maneuver a court will try to identify). I have the feeling that every competent programmer reading this post perfectly knows what a *reimplementation* is and how it looks. There will be inevitable similarities, but the code will be clearly not copied. If this is the legal setup, why do people care about clean room implementations? Well, the reality is: it is just an optimization in case of litigation, it makes it simpler to win in court, but being exposed to the original source code of some program, if the exposition is only used to gain knowledge about the ideas and behavior, is fine. Besides, we are all happy to have Linux today, and the GNU user space, together with many other open source projects that followed a similar path. I believe rules must be applied both when we agree with their ends, and when we don’t.

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网友评论

  • 资深用户

    讲得很清楚,适合入门了解这个领域。

  • 求知若渴

    难得的好文,逻辑清晰,论证有力。

  • 信息收集者

    非常实用的文章,解决了我很多疑惑。