Hi Rodolphe,

I don't think this is possible with Printf.  But if you can switch to
Format you can use Format.asprintf instead.

Cheers,
Nicolas


On Fri, Jul 8, 2016 at 10:01 AM, Rodolphe Lepigre <
rodolphe.lepigre@univ-savoie.fr> wrote:

> Dear list,
>
> If I define two values
>
>   val p : type out_channel -> blop -> unit
>   val e : blop
>
> then I can do something like
>
>   Printf.printf "%a" p e
>
> but I can't find a way to do something like
>
>   Printf.sprintf "%a" p e
>
> which is not well-typed. Is there any trick that I can use to avoid
> changing the type of [p] to [blop -> string]?
>
> Cheers,
>
> Rodolphe
> --
> Rodolphe Lepigre
> LAMA, Université Savoie Mont Blanc, FRANCE
> http://lama.univ-smb.fr/~lepigre/
>
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