Swift语法是什么? .bar"叫? [英] What is the Swift syntax " .bar" called?

问题描述

Swift具有以下方便的语法:

Swift has this handy syntax:

enum Foo {
    case bar
    case baz
}


func hoge(foo: Foo) {
}


hoge(foo: .bar) // This

在enum以外的其他地方被镜像:

Which is mirrored in places other than enums:

struct Qux {
    static let `default` = Qux()
}


func hoge(qux: Qux) {
}


hoge(qux: .default) // This

我不确定在对话/票证中该怎么称呼.也许是类型推断的点语法"?我不确定此语法是否有正式名称?如果是，它是什么?

I am not sure what to call this in conversation / tickets. Maybe "type-inferred dot syntax"? I'm unsure. Does this syntax have an official name? If so, what is it?

推荐答案

它称为隐式成员表达式.来自

隐式成员表达式是访问成员的缩写方式 在上下文中的类型，例如枚举用例或类型方法 类型推断可以确定隐式类型.它具有 格式如下:

An implicit member expression is an abbreviated way to access a member of a type, such as an enumeration case or a type method, in a context where type inference can determine the implied type. It has the following form:

. member name

例如:

var x = MyEnumeration.someValue
x = .anotherValue

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