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[Caml-list] Looking up exceptions in a dictionary
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Date: -- (:)
From: Fabrice Le Fessant <fabrice.le_fessant@i...>
Subject: Re: [Caml-list] Looking up exceptions in a dictionary 

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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