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Re: [Coq-Club] Lists & Strings

From: Stéphane Glondu <steph AT glondu.net>
To: Satrajit Roy <satrajit.roy AT gmail.com>
Cc: coq-club AT pauillac.inria.fr
Subject: Re: [Coq-Club] Lists & Strings
Date: Tue, 11 Nov 2008 17:20:20 +0100
List-archive: <http://pauillac.inria.fr/pipermail/coq-club/>
Openpgp: id=FCE03DAA

Satrajit Roy wrote:
> [...]
> Record y: Set := createY {
>   y': string;
>   y'': list x;
>
>   y''': bool :=
>     match (length y') return bool with
>       | 0 => false
>       | _ => true
>   end;
>
>   y'''' : bool  :=
>     match (length y'') return bool with
>       | 0 => false
>       | _ => true
>   end
> }.
> [...]

Use List.length to get the length of y''. For the sake of clarity, I
recommend you to use String.length for y' as well.

Cheers,

--
Stéphane Glondu

[Coq-Club] Re: Lists & Strings, Satrajit Roy
- Re: [Coq-Club] Lists & Strings, Stéphane Glondu
  - Re: [Coq-Club] Lists & Strings, Satrajit Roy