Re: [Chicken-users] Expecption Handling with chicken

[Thomas Chust]

Michael Erdmann wrote:
> [...]
> The interface i a little bit funy but look very mutch
> like the try...catch construct of java.
>
> ;; creating an intecepting an exception
> (call-with-current-continuation
>    (lambda (exit)
>       (handle-exceptions exn
>          (begin (put-line "Went wrong") (exit exn) )
>          (put-line "Expression 1")
>          (abort 'x)))
> )
>
> Java:
>
> try {
>    Expression1
>    throw ..
> }
> catch(Exception e) {
>
> }
>
> I can even use vectors or records to build exception types. Fine! Only
> this  call-with-current-continuation is clumsy.
> [...]

If it's only the clumsy function name you dislike, you can write call/cc 
instead of call-with-current-continuation -- that's not R5RS but a very 
common abbreviation supported by many Scheme implementations.

But the call-with-current-continuation in your example above is 
completely superfluous. You could write
       (handle-exceptions exn
          (begin
            (put-line "Went wrong") exn)
          (put-line "Expression 1")
          (abort 'x))
instead and get exactly the same behaviour. (Nevertheless 
call-with-current-continuation is used internally by handle-exceptions 
to do what it does...)

cu,
Thomas