問題描述

我知道 Swift 不使用命名空間，但名稱是在每個模塊中定義的.首先，我不太明白這是如何避免名稱沖突的 - 請隨意詳細說明.

I know that Swift doesn't use namespaces, but that names are defined within each module. First of all, I don't understand very well how this avoids name collisions -feel free to elaborate.

不過，我的主要問題是:假設我想要一個不使用 NSTreeNode 的樹結構，所以我創建了自己的名為TreeNode"的類.現在假設 Apple 決定在 Swift 的標準庫中包含一個用于構建樹的類，并且正如預期的那樣，他們將其命名為TreeNode".那會發生什么?我的自定義 TreeNode 將與標準庫的 TreeNode 發生沖突...在這種情況下我是否必須更改所有代碼?或者，Apple 會承諾 Swift 的標準庫在未來不會改變?

Nevertheless, my main question is: Let's say I want a tree structure without using NSTreeNode, so I make my own class named "TreeNode". Now let's say that Apple decides to include a class to build trees in Swift's standard library, and, as expected, they name it "TreeNode". What happens then? My custom TreeNode will collide with Standard Library's TreeNode... Will I have to change all my code in cases like that? Or maybe Apple will promise that Swift's Standard Library will not change in the future?

這里回答了問題(感謝@Martin R 的評論)

Question answered here (thanks @Martin R for your comment)

推薦答案

Swift 中的命名空間是隱式的.所有類和其他符號都屬于定義它們的目標(模塊).因此，如果您定義類 String，則完全限定名稱將是 MyTarget.String.當發生名稱沖突時，您必須在類名前加上定義它的模塊(框架)，除非在當前模塊中定義了具有該名稱的類 - 此類優先且不需要前綴.

Namespacing in Swift is implicit. All classes and other symbols belong to the target (module) they are defined in. So if you define a class String the fully qualified name would be MyTarget.String. When there is a name collision, you have to prefix the class name with the module (framework) it is defined in, except when there is a class with that name defined in the current module - this class takes precedence and does not need to be prefixed.

struct String {
    var swiftString = ""
}

var a = String()
var b = Swift.String()

因此，如果您創建了您的類 TreeNode 并且 Apple 后來也添加了一個 TreeNode，如果您只使用一個模塊并且您不會需要改變任何東西.如果您想使用 Swift 的 TreeNode，則需要將其稱為 Swift.TreeNode.

So if you create your class TreeNode and Apple later adds a TreeNode as well, your name would take precedence if you are using only one module and you wouldn't need to change anything. If you would want to use Swift's TreeNode, you would need to refer to it as Swift.TreeNode.

這篇關于Swift 的標準庫和名稱沖突的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！