如何让两个方法互相调用? [英] How to have two methods calling each other?

问题描述

我对如何让两个方法相互调用有点困惑(即，有 A() call B() 和 B() 调用 A()).似乎 F# 仅在代码中遇到该方法后才看到"该方法，因此如果没有，它只会说值或构造函数尚未定义.

I'm a bit confused as to how to get two method to call each other (i.e., have A() call B() and B() call A()). It seems that F# only 'sees' the method after it's been encountered in code, so if it hasn't, it just says value or constructor has not been defined.

我在这里遗漏了一些非常基本的东西吗?

Am I missing something very basic here?

推荐答案

'let rec... and...' 是您寻求的语法.

'let rec... and...' is the syntax you seek.

let rec F() = 
    G()
and G() =
    F()

另见 F# Co 的冒险-递归.

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