The F# equivalent of C#'s 'out'

Question

I am rewriting a C# library to F# and I need to translate the following code

bool success;
instance.GetValue(0x10, out success);

what is th

Answer 1

I think it's also worth mentioning here that the value of the out parameter doesn't have to be initialized.

It is possible to do the following:

let mutable success3 = Unchecked.defaultof
let result3 = o.GetValue (10, &success3)

This might be usefull in scenarios where you are calling a .NET library function with arrays as output parameters, i.e:

let mutable currFeatures = Unchecked.defaultof
let mutable status = Unchecked.defaultof
let mutable trackError = Unchecked.defaultof

CvInvoke.CalcOpticalFlowPyrLK(
      previousFrame, 
      nextFrame, 
      previousPoints, 
      Size(15,15), 
      2, 
      MCvTermCriteria(10, 0.03), 
      //Out params 
      &currFeatures, 
      &status, 
      &trackError,
      //---------
      LKFlowFlag.UserInitialFlow)