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Date: Mon, 17 Nov 2003 10:13:17 +0000
To: Selentek 24331-03 <epifanov@komset.ru>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] optional arguments
Message-ID: <20031117101317.GA21166@redhat.com>
References: <20031117085249.GA11793@inv_machine>
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From: Richard Jones <rich@annexia.org>
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On Mon, Nov 17, 2003 at 11:52:49AM +0300, Selentek 24331-03 wrote:
[...]

Like this?

# let f ?v () =
  match v with
  | Some i -> i + 1
  | None   -> 0      ;;
val f : ?v:int -> unit -> int = <fun>

# let v = Some 1;;
val v : int option = Some 1

# f ?v ();;
- : int = 2

# let v = None;;
val v : 'a option = None

# f ?v ();;
- : int = 0

Rich.

-- 
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