如何返回多个值并将其分配给可变变量? [英] How do you return multiple values and assign them to mutable variables?
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问题描述
这是我到目前为止所拥有的.
This is what I have so far.
let Swap (left : int , right : int ) = (right, left)
let mutable x = 5
let mutable y = 10
let (newX, newY) = Swap(x, y) //<--this works
//none of these seem to work
//x, y <- Swap(x, y)
//(x, y) <- Swap(x, y)
//(x, y) <- Swap(x, y)
//do (x, y) = Swap(x, y)
//let (x, y) = Swap(x, y)
//do (x, y) <- Swap(x, y)
//let (x, y) <- Swap(x, y)
推荐答案
您不能;没有语法可以通过一次分配来更新多个可变变量".当然可以!
You can't; there's no syntax to update 'more than one mutable variable' with a single assignment. Of course you can do
let newX, newY = Swap(x,y)
x <- newX
y <- newY
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