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[Caml-list] Catching exceptions into strings
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Date: -- (:)
From: Xavier Leroy <xleroy@p...>
Subject: Re: [Caml-list] Catching exceptions into strings
> I want to catch exceptions into strings. I do not want to have
> pre-defined exceptions in my module which can be handled. I want to
> catch exceptions like "floating point exceptions" etc.
> 
> I wrote the follwing piece of code:
> 
> value divide2 p = 2/p ;
> 
> value foo p =
>         try divide2 p
>         with
>         [e -> let _ =  do {print_string (Printexc.to_string e);flush stdout} in  9];
> 
> value _ = foo 0;
> 
> (This code is in the Camlp4 revised syntax).
> 
> When I compile and run this code, I get :
> 
> Floating point exception
> 
> However, after loading OCAML, if I use this file, I get
> 
>  value divide2 : int -> int = <fun>
> value arbit : int -> int = <fun>
> Division_by_zero
> 
> That is, in the latter case, I get what I want but in the former
> case, I don't.

ocamlopt-generated code does not turn division by zero into an exception,
like ocamlc-generated code or the toplevel environment do.  Instead,
you just get a hardware signal that kills the ocamlopt-generated program.
See section 11.4 of the OCaml manual for a complete list of
differences between ocamlopt and ocamlc.

- Xavier Leroy
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