Kotlin为枚举类值方法定义接口 [英] Kotlin define interface for enum class values method

问题描述

如果我定义了一个枚举类，那么说:

if I define an enum class, let's say:

enum class MyEnum { }

我可以做以下事情，因为枚举类都具有values方法:

I can do the following as enum class all have a values method:

val values = MyEnum.values()

现在，我希望我的枚举实现一个接口并可以访问values()方法:

Now I want my enum to implement an interface and have access to the values() method:

enum class MyEnum : EnumInterface { }

interface EnumInterface {
    fun values() : Array<T>

    fun doStuff() {
        this.values()
    }

}

这不会编译，我确定如何键入values方法.是否可以定义这样的接口?谢谢！

This doesn't compile and I'm sure how to type the values method. Is it possible to define such interface? Thanks!

推荐答案

您真的很接近正确的答案.您需要定义通用接口，枚举应使用枚举的类扩展它，如下所示:

You were really close to correct answer. You need to define generic interface and you enum should extend it typed with enum's class like this:

enum class MyEnum : EnumInterface<MyEnum> {
    A,B,C;
    override fun valuesInternal() = MyEnum.values()
}

interface EnumInterface<T> {    
    fun valuesInternal():Array<T>

    fun doStuff() {
        this.valuesInternal()
    }
}

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