From: ygrek <ygrekheretix@gmail.com>
To: Jon Harrop <jon@ffconsultancy.com>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] deriving show
Date: Fri, 12 Feb 2010 23:29:36 +0200 [thread overview]
Message-ID: <20100212232936.77ff1807.ygrekheretix@gmail.com> (raw)
In-Reply-To: <201002121954.50954.jon@ffconsultancy.com>
On Fri, 12 Feb 2010 19:54:50 +0000
Jon Harrop <jon@ffconsultancy.com> wrote:
>
> IIRC, there is an OCaml macro that will autogenerate the code to print values
> of a variant type from the type definition. Does it handle polymorphic
> variants?
Yes, but one needs to write out the type (as in the case with the closed variants) :
type t = [ `A of t | `B ] deriving (Show)
print_endline (Show.show<t>(`A `B))
--
ygrek
http://ygrek.org.ua
prev parent reply other threads:[~2010-02-12 21:29 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-12 19:54 Jon Harrop
2010-02-12 21:29 ` ygrek [this message]
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