如何将协议限制为仅值类型? [英] How to restrict a protocol to value types only?

问题描述

与这个问题，除了我不希望将协议仅限于类，我希望能够定义只能被枚举，结构等采用的协议.这可能吗?

Similar in spirit to this question, except, instead of limiting a protocol to only classes, I want to be able to define a protocol that can only be adopted by enums, structs etc.. Is this possible?

推荐答案

我找不到答案，但是通过反复试验，我得出了一个结论，那就是您找不到.为了将协议限制为仅类，您可以在其前加上class之类的

I couldn't find the answer, but through playing around, I've come to the conclusion that you can't. Being that to restrict a protocol to just classes, you precede it with class like

protocol SomeProto: class {
    func structYourStuff() -> Void
}

我假设在其他类型中这是一致的，

Making the assumption that this would be consistent among other types, I tried

protocol SomeProto: struct {
    func structYourStuff() -> Void
}

但是Xcode在同一行上给了我五个不同的错误，这使我得出结论:你做不到.不过我可能完全错了，我大约一个星期前才开始学习Swift

But Xcode gave me five different errors on one line, which brings me to the conclusion that you can't. I could be completely wrong though, I only started learning Swift about a week ago

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