Strip Unit of Measure from array

问题

I am calling external function requiring float[], but my array is float<m>[]. How could I strip the unit of measure from array?

I need something like the function below, but this does not compile. And I would like to avoid any iterating or duplicating of the array, as float<m> and float values are identical...

let demeasure (arr:float<m>[]): float[] = float[] (arr)

回答1:

I believe that a cast to obj, followed by a dynamic cast to float[] would work, e.g.

(arr :> obj) :?> float[]

because there is no runtime representation.

Possibly see also

F# Units of measure - 'lifting' values to float<something>

How to generically remove F# Units of measure

回答2:

[<Measure>]type m
let f (arr : float[]) : float = 0.0
let arr = [|1.0<m>|]
f (unbox (box arr))

回答3:

let demeasure (arr: float[]) = arr |> Array.map (fun i -> float i)

来源：https://stackoverflow.com/questions/11404027/strip-unit-of-measure-from-array