在F#中包装带有不确定数量的参数的函数 [英] Wrapping a function with an indeterminate number of parameters in F#

问题描述

我正在尝试用F#语言编写一个简单的包装器类，该类使用一个返回字符串的函数，并返回一个具有相同参数的函数，并从输入的包装"中返回字符串.

I'm trying to write a simple wrapper class in F# that takes a function that returns a string, and returns a function that takes the same parameters and returns the string from the input 'wrapped'.

以下代码适用于带有单个变量的函数(因此test可以正常工作):

The following code works for functions that take a single variable (so test works fine):

open System

let myFunc anotherFunc =
    fun x -> "boo" + anotherFunc x + "unboo"

let Func2 toDouble =
    (toDouble * 2).ToString ()

let test = myFunc Func2

let Func3 numOne numTwo =
    (numOne * numTwo).ToString ()

let test2 = myFunc Func3

do
    Console.WriteLine(test 10)
    Console.WriteLine(test2 5 10)

但是因为fun x ->指定单个参数，所以test2不是有效的代码.有没有一种语法可以允许这种构造?

But because fun x -> specifies a single parameter, test2 is not valid code. Is there a piece of syntax that would allow for this construct?

推荐答案

您的函数有效. 问题出在最后一行上

Your function works. The problem is in your last line when you do

let test2 = myFunc Func3

应该是

let test2 x = myFunc (Func3 x)

更新:

我假设您不想更改Func3.否则，您可能需要Tomas的解决方案.

I'm assuming you don't want to change Func3. Otherwise the solution from Tomas could be what you need.

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