swift - 如何理解 Swift 中的引用类型或 "Pointer"？

Question

Pointers

If you have experience with C, C++, or Objective-C, you may know that these languages use pointers to refer to addresses in memory. A Swift constant or variable that refers to an instance of some reference type is similar to a pointer in C, but is not a direct pointer to an address in memory, and does not require you to write an asterisk (*) to indicate that you are creating a reference. Instead, these references are defined like any other constant or variable in Swift.

Here是对 Apple doc 中“Pointers”的解释。我们都知道在C++或者Objective-c中，指针直接指向内存中的地址。但是在 Swift 中，Apple 说 A Swift constant or variable that references an instance of some reference type is similar to a pointer in C, but is not a direct pointer to an address in memory, 这让我很困惑很多。我的问题是引用类型背后的场景是什么，如果不是直接指向内存中的地址，它指向哪里？

任何提示或线索将不胜感激。

Answer 1

类是引用类型，因此引用它们的变量 (var) 和常量 (let) 实际上是“幕后”的指针。文档试图说明的是，这对程序员是隐藏的。 Swift 中没有指针运算符。