F# 对象在成员之前的 le​​t 绑定(bind)中引用 self

Question

对象是否可以在成员定义之前引用自己？像这样的东西:

type public ClassA () = class
    let b = new ClassB(this)
    member public x.getClassB() = b
    end

其中“this”是对创建 ClassB 的 ClassA 实例的引用？

Answer 1

类可以使用 as 在其构造函数中引用自己:

type public ClassA () as this = 
    let b = new ClassB(this)
    member public x.getClassB() = b
and public ClassB (a: ClassA) =
    member public x.getClassA() = a