From: Fabrice Le Fessant <fabrice.le_fessant@inria.fr>
To: "Marcin 'Qrczak' Kowalczyk" <qrczak@knm.org.pl>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Looking up exceptions in a dictionary
Date: Mon, 5 Nov 2001 10:29:08 +0100 (CET) [thread overview]
Message-ID: <15334.23524.25520.167099@lachesis.inria.fr> (raw)
In-Reply-To: <slrn9ucoqn.4an.qrczak@qrnik.zagroda>
In the CDK, there is a Printexc2 module which allows users to specify
printers for exceptions, that can be used by Printexc.to_string. The
way this is implemented is:
1- when a printer is registered, it has type exn -> string. Such a
printer is:
let not_found_handler exn = match exn with
Not_found -> "Not Found"
| _ -> raise exn
Thus, it reraises the excepion if it can not print it.
2- In Printexc.to_string, each printer is tried until a string is
returned. This doesn't require to know about the internal structure of
exceptions.
- Fabrice
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next prev parent reply other threads:[~2001-11-05 10:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-05 10:00 Marcin 'Qrczak' Kowalczyk
2001-11-05 9:29 ` Fabrice Le Fessant [this message]
2001-11-05 10:18 ` Xavier Leroy
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