If you mean what C# calls "ref", then pass
&x
instead of just 'x'. 'x' should be declared as mutable
let mutable x = ...
See also
[link:lorgonblog.spaces.live.com]
since you are coming from a C# background.
Other than inter-op reason(like the TryFind etc. in .NET dictionary), why would one want to pass a mutable ref to a function ?
Personally, I found it a very confusing coding style.
&X seems to work fine, thanks.
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I create an object = new myofject()
how do I pass it's ref to a function?