什么是<> （尖括号）对类名在swift？ [英] What does <> (angle brackets) do on class names in swift?

问题描述

在类声明中，使用<>尖括号和在swift中声明的参数是什么？如：

In a class declaration what is the use of <> angle brackets and the parameters declared inside in swift? Like as:

public class ClassName<T: Comparable> {


}

推荐答案

它使类通用。 Swift标准库没有很多泛型类的例子，但它有一些非常着名的通用结构和枚举：

It makes the class generic. The Swift standard library doesn't have a lot of examples of generic classes, but it has some very well-known generic structs and enums:

public struct Array<Element> : CollectionType, MutableCollectionType, _DestructorSafeContainer

public struct Dictionary<Key : Hashable, Value> : CollectionType, DictionaryLiteralConvertible

public enum Optional<Wrapped> : _Reflectable, NilLiteralConvertible

阅读更多关于Genericsin the Swift Programming Language 。

Read more about generics under "Generics" in The Swift Programming Language.

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