Try/Cond

[Richard Carlsson]

----- Original Message ----- 
From: "Sean Hinde" <sean.hinde@REDACTED>
To: "Richard Carlsson" <richardc@REDACTED>
Cc: "Erlang Questions" <erlang-questions@REDACTED>
Sent: Tuesday, October 21, 2003 8:50 PM
Subject: Re: Try/Cond


> So try is like (guessing):
> 
> try
>   func1(xx),
>   f2(yy)
> catch
>   {'EXIT', Reason} ->
>     {error, oops};
>   ok ->
>     ok
> end.
> 
> ?

The main points are 1) being able to definitely separate exceptions
from return values, and 2) being able to catch only those exceptions
one is interested in, letting everything else fall through. Something
like:

    try
      f(X)
    catch
      {throw, file_not_found} ->
          ...
    end

also, we want to be able to directly switch on the result in the
successful case. Something like this:

    try scan(FD) of
      foo -> ...;
      bar -> ...
    catch
      {throw, eof} ->
          ...
    end

        /Richard