From: Jacques Carette <carette@mcmaster.ca>
To: Markus Mottl <markus.mottl@gmail.com>
Cc: Alain Frisch <alain@frisch.fr>, OCaml List <caml-list@yquem.inria.fr>
Subject: Re: [Caml-list] First-class modules in functor bodies
Date: Mon, 20 May 2013 10:07:27 -0400 [thread overview]
Message-ID: <519A2E1F.5000101@mcmaster.ca> (raw)
In-Reply-To: <CAP_800p7HeOHzBeBGzo9U-aEOy2LrANBx1_34+9U-Lxr-G6u5Q@mail.gmail.com>
On 13-05-20 10:01 AM, Markus Mottl wrote:
> On Mon, May 20, 2013 at 3:31 AM, Alain Frisch <alain@frisch.fr> wrote:
>> Here is an counter-example provided by Didier Rémy:
> [snip]
>> module F(U:sig end) =
>> (val (if !b then (module X1 : X) else (module X2 : X)) : X)
> Ah, yeah, that's evil.
If only there were an _option_ to have OCaml track state in its types,
lots of this would be greatly simplified, at least for those OCaml
programmers willing to do that.
I understand that not tracking state (or other effects) in OCaml types
is a fundamental design decision that makes OCaml a hybrid
functional-imperative language. I just wish I had the option of using
it purely functionally, and the compiler would then give me all the
accompanying riches that comes with that choice.
Jacques
prev parent reply other threads:[~2013-05-20 14:13 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-19 15:14 Markus Mottl
2013-05-19 23:07 ` Philippe Wang
2013-05-20 0:26 ` Markus Mottl
2013-05-20 7:31 ` Alain Frisch
2013-05-20 14:01 ` Markus Mottl
2013-05-20 14:07 ` Jacques Carette [this message]
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