From: Gabriel Scherer <gabriel.scherer@gmail.com>
To: Kenichi Asai <asai@is.ocha.ac.jp>
Cc: caml users <caml-list@inria.fr>
Subject: Re: [Caml-list] Locally abstract parameterized types?
Date: Sat, 18 Apr 2020 09:35:47 +0200 [thread overview]
Message-ID: <CAPFanBHvrnTqq1q0Ony4yqGvZPr9odKw_orZoA5Lje6T_RDRCA@mail.gmail.com> (raw)
In-Reply-To: <20200418022319.GA75735@pllab.is.ocha.ac.jp>
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Dear Kenichi,
No, this is currently not supported. For this use-case you will have to use
modules, typically a functor (in some circumstances a first-class module
parameter may work as well, if the return type does not depend on the
parameter).
On Sat, Apr 18, 2020 at 4:24 AM Kenichi Asai <asai@is.ocha.ac.jp> wrote:
> OCaml allows locally abstract types:
>
> let f (type t) x = ...
>
> Can the t take parameters as in 'a t? I want to have a locally
> abstract type that has type parameters. The manual says the t in
> (type t) must be {typeconstr-name}+ which expands to a sequence of
> lowercase-ident, so probably this is not allowed...
>
> --
> Kenichi Asai
>
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next prev parent reply other threads:[~2020-04-18 7:36 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-18 2:23 Kenichi Asai
2020-04-18 7:35 ` Gabriel Scherer [this message]
2020-04-18 9:47 ` Kenichi Asai
2020-04-18 10:01 ` Gabriel Scherer
2020-04-18 10:04 ` Jeremy Yallop
2020-04-18 11:00 ` Kenichi Asai
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