问题描述
据我所知，如果我想定义一个协议（ defprotocol ），只有一个 defrecord ，我仍然必须先定义协议，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] ...))
有没有办法结合两者，可能有一个匿名协议？
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重新发明一个无意义版本的OOP在一个有更好的选择的语言。定义对您的记录进行操作的常规旧函数;
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.
如果你以后想重构它是一个协议，它很容易！客户端将无法区分这种差异，因为协议函数调用看起来像常规函数调用。
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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