From: "Richard W.M. Jones" <rich@annexia.org>
To: Florian Angeletti <octa@polychoron.fr>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Returning printf from a function
Date: Thu, 23 Aug 2018 11:23:08 +0100 [thread overview]
Message-ID: <20180823102308.5mnfm7x3p26lgrhp@annexia.org> (raw)
In-Reply-To: <81f925d8-a5e0-2c6b-b2c7-a752e2db4135@polychoron.fr>
On Thu, Aug 23, 2018 at 12:08:10PM +0200, Florian Angeletti wrote:
> A solution that works in this specific example and does not require to
> rewire the logic is
> to return the printing function inside a record with the right universal
> quantification:
>
> ...
>
> type debug = {fn: 'a. ('a, unit, string, unit) format4 -> 'a }[@@unboxed];;
>
> let udebug = {fn=debug}
>
> let give_fn () = Some udebug
>
> ...
>
> | Some {fn} ->
> fn "fn";
> fn "fn param: %s" param
Thanks, that does indeed work.
Rich.
--
Richard Jones
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prev parent reply other threads:[~2018-08-23 10:23 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-23 9:15 Richard W.M. Jones
2018-08-23 9:28 ` Florian Angeletti
2018-08-23 9:48 ` Richard W.M. Jones
2018-08-23 10:08 ` Florian Angeletti
2018-08-23 10:23 ` Richard W.M. Jones [this message]
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