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From: Jonas Jensen <jj@issuu.com>
To: "Soegtrop, Michael" <michael.soegtrop@intel.com>
Cc: "caml-list@inria.fr" <caml-list@inria.fr>
Subject: Re: [Caml-list] Newbie comment on constructor syntax
Date: Fri, 6 Nov 2015 13:29:09 +0100
Message-ID: <CAExvvWzu065eE-spRsvY4nmo2B0WyTxnS=KxktkHGOL6K9hA0A@mail.gmail.com> (raw)
In-Reply-To: <0F7D3B1B3C4B894D824F5B822E3E5A172CE3E070@IRSMSX102.ger.corp.intel.com>

If you're feeling adventurous, you can try Jun Furuse's ppx extension
that enables curried and partially-applied constructors:
https://bitbucket.org/camlspotter/ppx_curried_constr

On 6 November 2015 at 10:33, Soegtrop, Michael
<michael.soegtrop@intel.com> wrote:
>
> Dear Ocaml users,
>
> I just started to develop in OCaml, and must say it is smoother than expected. Although I did C/C++ for decades, I do less errors in Ocaml, both syntactically and in terms of if programs behave as expected. It appears to be much closer to human thinking than C/C++ and I already wonder how I could live without currying and type inference before.
>
> The one thing I find rather non intuitive is that variant constructors can take only one argument - or a tuple. Although I know it is wrong, I always write "Constr a b" instead of "Constr (a, b)". I know syntax is only a minor thing and mostly a matter of taste, but a large fraction of my syntax errors in new code are of this kind (when modifying code it is a bit different). Somehow I think this doesn't go together well with the function call syntax of OCaml. I guess deep in my brain a constructor is a function which takes arguments and returns an element of the type it constructs, so I guess I want to use the usual function call syntax.
>
> My question: Is there some syntax to give a constructor more than one argument which escaped me? Something like if I leave away the * in the definition I can use usual function call syntax in constructions and expressions? I would find this easier to read and to write, especially in matches or nested constructs. Does everybody use camlp4/p5/ppx to customize the syntax to his liking (as chapter 5 of the camlp4 manual suggests)? Or are there some long term advantages of this syntax I don't see as yet?
>
> Best regards,
>
> Michael
>
> Intel Deutschland GmbH
> Registered Address: Am Campeon 10-12, 85579 Neubiberg, Germany
> Tel: +49 89 99 8853-0, www.intel.de
> Managing Directors: Christin Eisenschmid, Christian Lamprechter
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>
> --
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  parent reply index

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-06  9:33 Soegtrop, Michael
2015-11-06 10:04 ` Nicolas Ojeda Bar
2015-11-06 10:31 ` Francois Berenger
2015-11-06 12:20   ` Soegtrop, Michael
2015-11-06 12:34     ` Gabriel Scherer
2015-11-06 13:09       ` Soegtrop, Michael
2015-11-06 14:10         ` Ashish Agarwal
2015-11-06 15:19           ` Soegtrop, Michael
2015-11-06 15:22             ` Ashish Agarwal
2015-11-21 17:24       ` [Caml-list] Notation for currying Hendrik Boom
2015-11-21 17:42         ` Gabriel Scherer
2015-11-21 18:06         ` David Rajchenbach-Teller
2015-11-21 18:56           ` Gabriel Scherer
2015-11-06 12:29 ` Jonas Jensen [this message]
2015-11-06 12:46   ` [Caml-list] Newbie comment on constructor syntax Soegtrop, Michael
2015-11-06 12:55     ` Gabriel Scherer
2015-11-08 21:17 ` Florian Weimer
2015-11-08 22:51   ` Norman Hardy
2015-11-09  6:27     ` Florian Weimer
2015-11-09 13:27       ` Stefan Monnier
2015-11-09  8:10     ` Soegtrop, Michael
2015-11-09 10:00       ` Hendrik Boom
2015-11-09 10:17       ` Alain Frisch
2015-11-09 10:35         ` Andreas Rossberg
2015-11-09 12:28           ` Alain Frisch
2015-11-09 17:33           ` Alain Frisch
2015-11-09 18:09             ` Gabriel Scherer
2015-11-09 18:16               ` Andreas Rossberg
2015-11-09 21:12                 ` Gabriel Scherer
2015-11-09 22:06                   ` Alain Frisch
2015-11-09 22:27                   ` Andreas Rossberg
2015-11-09 22:57                     ` Jeremy Yallop
2015-11-10  0:11                   ` Hendrik Boom
2015-11-10  8:27                   ` Soegtrop, Michael
2015-11-10 10:26                     ` Romain Bardou
2015-11-10 10:44                       ` Alain Frisch
2015-11-10 10:55                         ` Romain Bardou
2015-11-10 13:17                           ` Alain Frisch
2015-11-10 13:41                             ` Romain Bardou
2015-11-10 14:01                               ` Alain Frisch
2015-11-13 15:36                           ` Romain Bardou
2015-11-10 11:17                         ` Soegtrop, Michael
2015-11-10 14:11                     ` Hendrik Boom
2015-11-10 14:40                       ` immanuel litzroth
2015-11-10 15:30                       ` Soegtrop, Michael
2015-11-10 17:28                         ` Gerd Stolpmann
2015-11-09 20:32               ` Alain Frisch

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