Kotlin是否支持或将来制定类似于Swift中协议组成的接口组成计划? [英] Does Kotlin support or have future plan for Interface Composition similar to Protocol Composition in Swift?

问题描述

到目前为止，我找到的答案可能是否"，但我想知道将来是否有任何计划支持此功能.这就是Swift中的样子.

The answer I found so far is probably a NO but I wonder if there is any plan of future support for this feature. Here is what it looks like in Swift.

协议组合物的形式为SomeProtocol&另一个协议.您可以根据需要列出任意数量的协议，并用与号(&)分隔.除了协议列表以外，协议组成还可以包含一个类类型，您可以使用它来指定所需的超类.

Protocol compositions have the form SomeProtocol & AnotherProtocol. You can list as many protocols as you need, separating them with ampersands (&). In addition to its list of protocols, a protocol composition can also contain one class type, which you can use to specify a required superclass.

protocol Named 
{
    var name: String { get }
}

protocol Aged 
{
    var age: Int { get }
}

func wishHappyBirthday(to celebrator: Named & Aged) 
{
    print("Happy birthday, \(celebrator.name), you're \(celebrator.age)!")
}

推荐答案

您无法在Kotlin中显式定义交集类型，但可以使用泛型类型约束在函数参数中实现交集类型.像这样:

You can not explicitly define intersection types in Kotlin, but you can use generic type constraints to achieve it in a function parameter. Like this:

interface Named {
    val name: String
}

interface Aged {
    val age: Int
}

fun <T> wishHappyBirthday(celebrator: T) where T : Named, T : Aged {
    println("Happy birthday, ${celebrator.name}, you're ${celebrator.age}!")
}

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