[Caml-list] Missing tabs

[Caml-list] Missing tabs

[Richard Jones]

$ ocaml
        Objective Caml version 3.07+2

# open Printf;;
# List.iter (printf "\t%s\n") ["foo"; "bar"; "baz"; "buz"];;
        foo
bar
baz
buz
- : unit = ()
#

Where did the second and subsequent tabs go? I even tried piping the
output into the 'hd' shell command, and they are definitely missing.

Rich.

-- 
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Re: [Caml-list] Missing tabs

[Nicolas George]

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Le quintidi 5 brumaire, an CCXII, Richard Jones a 'ecrit:
> # List.iter (printf "\t%s\n") ["foo"; "bar"; "baz"; "buz"];;

This is a FAQ: you can not partially apply the format string of
printf-like functions. Try (fun x -> printf "\t%s\n" x) instead.

And please note that 'buz' has never been reported as a metasyntactic
variable :)

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Re: [Caml-list] Missing tabs

[Richard Jones]

On Sun, Oct 26, 2003 at 01:17:58PM +0100, Nicolas George wrote:
> Le quintidi 5 brumaire, an CCXII, Richard Jones a 'ecrit:
> > # List.iter (printf "\t%s\n") ["foo"; "bar"; "baz"; "buz"];;
> 
> This is a FAQ: you can not partially apply the format string of
> printf-like functions. Try (fun x -> printf "\t%s\n" x) instead.

I've now read: http://caml.inria.fr/FAQ/FAQ_EXPERT-eng.html#printf
thanks.

Hmmm ... This does appear to violate the principle of least surprise.

So:

  let g = Printf.printf " ** %i";;

is supposed to be equivalent to:

  let g = print_string " ** "; fun i -> print_int i;;

I would say that it should be equivalent to:

  let g = fun i -> (print_string " ** "; print_int i);;

and that the other behaviour is a bug, even if there are
implementation reasons why it is otherwise ...

Just my EUR 0.02.

Rich.

-- 
Richard Jones. http://www.annexia.org/ http://freshmeat.net/users/rwmj
Merjis Ltd. http://www.merjis.com/ - all your business data are belong to you.
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Re: [Caml-list] Missing tabs

[John Carr]

> I've now read: http://caml.inria.fr/FAQ/FAQ_EXPERT-eng.html#printf
> thanks.
> 
> Hmmm ... This does appear to violate the principle of least surprise.

I agree with this statement and the proposed less confusing
meaning of printf.

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Re: [Caml-list] Missing tabs

[Remi Vanicat]

Richard Jones <rich@annexia.org> writes:

> $ ocaml
>         Objective Caml version 3.07+2
>
> # open Printf;;
> # List.iter (printf "\t%s\n") ["foo"; "bar"; "baz"; "buz"];;
>         foo
> bar
> baz
> buz
> - : unit = ()
> #
>
> Where did the second and subsequent tabs go? I even tried piping the
> output into the 'hd' shell command, and they are definitely missing.

printf is partially applied : when you do (printf "\t%s\n"), you print
a tab, and return a function that print its string argument and a new
line.

this will make what you want :

List.iter (fun x -> printf "\t%s\n" x) ["foo"; "bar"; "baz"; "buz"];;


-- 
Rémi Vanicat

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