From: Jacques Garrigue <garrigue@kurims.kyoto-u.ac.jp>
To: msk@post.tepkom.ru
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] format types
Date: Thu, 27 Sep 2001 09:35:01 +0900 [thread overview]
Message-ID: <20010927093501F.garrigue@kurims.kyoto-u.ac.jp> (raw)
In-Reply-To: <01092512594301.08201@kouzdra.glokaya>
> why
>
> let _ = List.map printf (["abc\n"; "def\n"]:('a,'b,'c) format list)
>
> work properly, but:
>
> let _ = List.map printf ["abc\n"; "def\n"]
>
> doesn't compiled with message
>
> This expression has type ('a, out_channel, unit) format -> 'a
> but is here used with type string -> 'b
>
> I know, O'Caml format type is a hack, but I can't undertand difference
> between thees two expressions for the type inference algorighm.
You have the answer: this is a hack, and there are no guarantees
anything will type (or have the expected side-effects) if you do not
follow the documentation.
If you understand how the hack works, then you can write the
following (which does not seem very useful):
# let map_printf l = List.map Printf.printf l;;
val map_printf : ('a, out_channel, unit) format list -> 'a list = <fun>
# map_printf ["abc"; "def"];;
abcdef- : unit list = [(); ()]
Jacques Garrigue
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next prev parent reply other threads:[~2001-09-27 0:35 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-24 23:40 [Caml-list] Initial port of ocaml for mingw (long) art
2001-09-25 8:59 ` [Caml-list] format types Anton Moscal
2001-09-27 0:35 ` Jacques Garrigue [this message]
2001-10-17 19:07 ` [Caml-list] Ocaml 3.03 alpha MinGW port Dmitry Bely
2001-10-22 1:46 ` Masakazu Fukuzawa
2001-10-22 14:56 ` Dmitry Bely
2001-10-22 16:18 ` Masakazu Fukuzawa
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