* deriving show
@ 2010-02-12 19:54 Jon Harrop
2010-02-12 21:29 ` [Caml-list] " ygrek
0 siblings, 1 reply; 2+ messages in thread
From: Jon Harrop @ 2010-02-12 19:54 UTC (permalink / raw)
To: caml-list
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?
--
Dr Jon Harrop, Flying Frog Consultancy Ltd.
http://www.ffconsultancy.com/?e
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Caml-list] deriving show
2010-02-12 19:54 deriving show Jon Harrop
@ 2010-02-12 21:29 ` ygrek
0 siblings, 0 replies; 2+ messages in thread
From: ygrek @ 2010-02-12 21:29 UTC (permalink / raw)
To: Jon Harrop; +Cc: caml-list
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
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