From: Ashish Agarwal <agarwal1975@gmail.com>
To: Martin DeMello <martindemello@gmail.com>
Cc: Jeremy Yallop <yallop@gmail.com>,
"caml-list@inria.fr" <caml-list@inria.fr>
Subject: Re: [Caml-list] intersections of polymorphic variants
Date: Thu, 9 Feb 2017 10:15:16 -0500 [thread overview]
Message-ID: <CAMu2m2LtT6aKh0_mB1Zdctpek-6URcVJO+15a6qZFnYyhBq9aA@mail.gmail.com> (raw)
In-Reply-To: <CAFrFfuFa+WwY87vE5HjQen8Godaz0R_vur1-3+GQM4Uu3oUmTA@mail.gmail.com>
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Also you might want abbreviation patterns. If your `value` type included
all `color` values, like this:
type value = [color | `Missing]
then, you could write:
let state_of_value v = match v with
| #color as c -> Color (color_index c)
| `Missing -> Missing
On Thu, Feb 9, 2017 at 5:03 AM, Martin DeMello <martindemello@gmail.com>
wrote:
> On Thu, Feb 9, 2017 at 1:57 AM, Jeremy Yallop <yallop@gmail.com> wrote:
>
>> >
>> > let state_of_value v = match v with
>> > | `Red | `Blue | `Green -> ?????
>> > | `Missing -> Missing
>>
>> let state_of_value v = match v with
>> | (`Red | `Blue | `Green) as c -> Color (color_index c)
>> | `Missing -> Missing
>>
>
> perfect, thanks!
>
> martin
>
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prev parent reply other threads:[~2017-02-09 15:16 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-09 9:52 Martin DeMello
2017-02-09 9:57 ` Jeremy Yallop
2017-02-09 10:03 ` Martin DeMello
2017-02-09 15:15 ` Ashish Agarwal [this message]
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