如何將標籤鏈接到F＃中的可變變量？

Question

我想在F＃中創建一個使用可變變量返回值的標籤。不幸的是F＃將這個標籤設置爲一個常量值。如果mutable的值發生變化，則標籤的值將保留。這有點不一致嗎？有沒有辦法讓標籤（「a」）依賴於mutable（「x」）？

let mutable x = 0; 

let a = x + 2; // I want not to set a to a constant value 
let b two = x + two; 

x <- 1; 

let c = b 2; 

let isConsistent = a = c; 


val mutable x : int = 1 
val a : int = 2 
val b : two:int -> int 
val c : int = 3 
val isConsistent : bool = false 

Answer 1

從你自己的評論，你想a成爲函數返回X + 2
的是直接的翻譯是：

let mutable x = 0 

let a() = x + 2 
let b two = x + two 

x <- 1 

let c = b 2 

let isConsistent = a() = c // don't forget to call the function 'a' 

(* 
val mutable x : int = 1 
val a : unit -> int 
val b : two:int -> int 
val c : int = 3 
val isConsistent : bool = true 
*)