Swift 语法“.bar”叫什么？

Question

Swift 有这个方便的语法：

enum Foo {
    case bar
    case baz
}


func hoge(foo: Foo) {
}


hoge(foo: .bar) // This

镜像在 enums 以外的地方：

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


func hoge(qux: Qux) {
}


hoge(qux: .default) // This

我不确定在对话/工单中如何称呼它。也许 "type-inferred dot syntax"？我不确定。 这个语法有正式名称吗？如果有，它是什么？

Answer 1

来自苹果的Swift book：

The values defined in an enumeration (such as north, south, east, and west) are its enumeration cases.

Answer 2

它被称为隐式成员表达式。来自 the grammar section of the language guide:

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

For example:
var x = MyEnumeration.someValue
x = .anotherValue

Swift 语法“.bar”叫什么？

What is the Swift syntax " .bar" called?

syntax

naming

swift