结合 Clojure defprotocol 和 defrecord [英] Combining Clojure defprotocol and defrecord

问题描述

据我所知，如果我想定义一个只能由一个defrecord实现的协议(defprotocol)，我仍然需要定义协议首先，然后定义实现它的defrecord:

As far as I can tell, if I want to define a protocol (defprotocol) that will only be implemented by one defrecord, I still have to define the protocol first, then define the defrecord that implements it:

(defprotocol AProtocol
  (a-method [this])
  (b-method [this that]))

(defrecord ARecord [a-field b-field]
  AProtocol
  (a-method [this] ...)
  (b-method [this that] ...))

有没有办法将两者结合起来，也许是匿名"协议?

Is there no way to combine the two, perhaps with an "anonymous" protocol?

推荐答案

不要这样做.您的记录实现的私有"或匿名"协议只是用具有更好选择的语言重新发明无意义的 OOP 版本.定义一个对您的记录进行操作的常规旧函数；没有理由必须将其物理连接到它们.

Don't do this. A "private" or "anonymous" protocol that your record implements is just reinventing a pointless version of OOP in a language that has better options. Define a regular old function that operates on your records; there's no reason it has to be physically attached to them.

如果您以后想将其重构为协议……这很容易！客户端将无法分辨其中的区别，因为协议函数调用看起来就像常规函数调用一样.

If you later want to refactor it to be a protocol instead...it's easy! The client won't be able to tell the difference, because protocol function calls look just like regular function calls.

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