Swift的标准库和名称冲突 [英] Swift's standard library and name collision

问题描述

我知道Swift不使用名称空间，但是名称是在每个模块中定义的.首先，我不太了解如何避免名称冲突-请您详细说明.

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.

尽管如此，我的主要问题是:假设我想要一个不使用NSTreeNode的树结构，所以我创建了自己的名为"TreeNode"的类.现在让我们说Apple决定在Swift的标准库中包括一个用于构建树的类，并且按预期的那样，它们将其命名为"TreeNode".那会发生什么呢?我的自定义TreeNode将与标准库的TreeNode冲突...在这种情况下，我是否需要更改所有代码?还是苹果会承诺Swift的标准库将来不会更改?

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?

在此处回答了问题(感谢@Martin R的评论)

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

推荐答案

在Swift中命名空间是隐式的.所有类和其他符号都属于它们在其中定义的目标(模块).因此，如果定义类String，则完全限定名称为MyTarget.String.发生名称冲突时，您必须在类名称前添加定义的模块(框架)，除非当前模块中定义了具有该名称的类-此类优先且不需要前缀.

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，如果您创建类TreeNode，而Apple随后又添加了一个TreeNode，则仅使用一个模块且无需更改任何内容时，您的名称将优先.如果要使用Swift的TreeNode，则需要将其称为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.

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