[Caml-list] Printf.sprintf "%a"

[Caml-list] Printf.sprintf "%a"

[Rodolphe Lepigre]

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/

Re: [Caml-list] Printf.sprintf "%a"

[Nicolas Ojeda Bar]

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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/
>
> --
> Caml-list mailing list.  Subscription management and archives:
> https://sympa.inria.fr/sympa/arc/caml-list
> Beginner's list: http://groups.yahoo.com/group/ocaml_beginners
> Bug reports: http://caml.inria.fr/bin/caml-bugs
>

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Re: [Caml-list] Printf.sprintf "%a"

[Rodolphe Lepigre]

Thanks for your answer!

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

Yes, I know it is possible to use Format. This is actually what I am doing
currently! However, I am not using any of the formating features, so I'd
like to switch to Printf to avoid going from channels to formatters all the
time...

>> 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

Cheers,

Rodolphe
-- 
Rodolphe Lepigre
LAMA, Université Savoie Mont Blanc, FRANCE
http://lama.univ-smb.fr/~lepigre/
On 08/07/2016 10:08, Nicolas Ojeda Bar wrote:

Re: [Caml-list] Printf.sprintf "%a"

[Gabriel Scherer]

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For non-formatted printing, I find that bprintf (using Buffer.t) is the
more composable primitive.

On Fri, Jul 8, 2016 at 4:16 AM, Rodolphe Lepigre <
rodolphe.lepigre@univ-savoie.fr> wrote:

> Thanks for your answer!
>
> > I don't think this is possible with Printf.  But if you can switch to
> Format
> > you can use Format.asprintf instead.
>
> Yes, I know it is possible to use Format. This is actually what I am doing
> currently! However, I am not using any of the formating features, so I'd
> like to switch to Printf to avoid going from channels to formatters all the
> time...
>
> >> 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
>
> Cheers,
>
> Rodolphe
> --
> Rodolphe Lepigre
> LAMA, Université Savoie Mont Blanc, FRANCE
> http://lama.univ-smb.fr/~lepigre/
> On 08/07/2016 10:08, Nicolas Ojeda Bar wrote:
>
> --
> Caml-list mailing list.  Subscription management and archives:
> https://sympa.inria.fr/sympa/arc/caml-list
> Beginner's list: http://groups.yahoo.com/group/ocaml_beginners
> Bug reports: http://caml.inria.fr/bin/caml-bugs
>

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Re: [Caml-list] Printf.sprintf "%a"

[Jonathan Protzenko]

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Basically what we did for Mezzo. All printers are intended to work with 
Buffer.t and %a; then, define a bunch of variants of fprintf, iprintf, 
kprintf, sprintf, eprintf that work with Buffer.t

https://github.com/protz/mezzo/blob/master/lib/MzString.ml

On 7/8/16 3:53 AM, Gabriel Scherer wrote:
> For non-formatted printing, I find that bprintf (using Buffer.t) is 
> the more composable primitive.
>
> On Fri, Jul 8, 2016 at 4:16 AM, Rodolphe Lepigre 
> <rodolphe.lepigre@univ-savoie.fr 
> <mailto:rodolphe.lepigre@univ-savoie.fr>> wrote:
>
>     Thanks for your answer!
>
>     > I don't think this is possible with Printf.  But if you can
>     switch to Format
>     > you can use Format.asprintf instead.
>
>     Yes, I know it is possible to use Format. This is actually what I
>     am doing
>     currently! However, I am not using any of the formating features,
>     so I'd
>     like to switch to Printf to avoid going from channels to
>     formatters all the
>     time...
>
>     >> 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
>
>     Cheers,
>
>     Rodolphe
>     --
>     Rodolphe Lepigre
>     LAMA, Université Savoie Mont Blanc, FRANCE
>     http://lama.univ-smb.fr/~lepigre/
>     <http://lama.univ-smb.fr/%7Elepigre/>
>     On 08/07/2016 10:08, Nicolas Ojeda Bar wrote:
>
>     --
>     Caml-list mailing list.  Subscription management and archives:
>     https://sympa.inria.fr/sympa/arc/caml-list
>     Beginner's list: http://groups.yahoo.com/group/ocaml_beginners
>     Bug reports: http://caml.inria.fr/bin/caml-bugs
>
>


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