Swift省略。self调用需要元类型的函数?

Here is the code I write:

下面是我写的代码:

func printType<T: Any>(one: T.Type) {
    print(one)
}
func printType2<T: Any>(one: T.Type, name: String) {
    print(one)
}
printType(Set<Int>)
printType2(Set<Int>.self, name: "name")

I wonder why printType(Set<Int>) can work. And in printType2(Set<Int>.self, name: "name"), I can not leave out .self to make it work.

我想知道为什么printType(Set )可以工作。和在printType2(< Int >。self, name: "name")，我不能省略。self。

Edit:

编辑:

I want to know which rule imply when I can omit .self. I had tried to find it in Apple official references, but failed.

我想知道当我可以省略。self时，这条规则意味着什么。我曾试图在苹果官方的推荐信中找到它，但失败了。

Edit:

编辑:

I test the codes in Xcode Version 7.1 (7B91b).

我在Xcode版本7.1 (7B91b)中测试代码。

1 个解决方案

#1

I also ask it in apple official forum, and get an answer there:

我也在苹果官方论坛上问过这个问题，得到的答案是:

This is a famous undocumented feature of Swift, since 1.0 (or former > betas, which I cannot confirm).

这是自1.0(或前> betas，我无法确认)以来Swift的一个著名的未公开的特性。

When calling a method or function with single type argument, you can omit > .self . I guess this feature is included into Swift to make sizeof-like functions > neat, but not sure.

当使用单个类型参数调用方法或函数时，可以省略> .self。我猜Swift中包含了这个特性，以使类似于sizeof的函数>更简洁，但不确定。

https://forums.developer.apple.com/thread/24980

#1