[英]Protocols with associated type in Swift 3
I found out that associated types complicates a little bit Swift for me, especially because I keep in mind Java approach. 我发现关联类型对我来说让Swift变得有些复杂,尤其是因为我牢记Java方法。
My problem is that I want to create simple interface (oh, right, protocol) which could look like this: 我的问题是我想创建一个看起来像这样的简单接口(哦,正确,协议):
protocol Sender {
associatedtype Data
func send(data: Data)
}
In Java it would look like this: 在Java中,它看起来像这样:
class Sender<T> {
void send(T data);
}
And now I want to use this protocol as method parameter, but I don't know how I can do it in Swift, but in Java it would look like this ;) (String type as example) 现在,我想将此协议用作方法参数,但是我不知道如何在Swift中完成此操作,但是在Java中,它看起来像这样;)(以字符串类型为例)
void addSender(Sender<String> sender) {
// do something
}
So how can I achieve this using Swift? 那么如何使用Swift实现呢?
You could write something like 你可以写类似
func addSender<T: Sender>(_ sender: T) where T.Data == String {
}
I'm not sure if there's a shorter alternative to make this work. 我不确定是否有更短的选择可以完成这项工作。
A Sender
implementation for String
s could look like this: String
的Sender
实现可能如下所示:
class StringSender : Sender {
//typealias Data = String <- This can be inferred from the parameter type of send
func send(data: String) {
// Send a string
}
}
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