Re: Announce: OpenToken 2.0 released

["Vladimir Olensky" <vladimir_olensky@yahoo.com>]

Hyman Rosen wrote in message ...
>Brian Rogoff <bpr@shell5.ba.best.com> writes:
>> (1) Exceptions: raise a Not_Found when input is exhausted. Some people
>>     hate this because "Exceptions are only for error handling, not
>>     control flow!". OCaml (and SML too I think) use exceptions for this,
>>     and Ada sometimes does (try reading a file stream without using
>>     File_Type...)
>
>I don't like this much.
>Exceptions are for error handling, not control flow :-)


It seems to me that this is somewhat narrow view on that.

   More generally exceptions could  be viewed as mechanism
that gives  user a tool to signal  outside that some condition is
true and ability to handle this signal in the place that is not
known in advance.
  Or it may be viewed as some program event.  In the event driven
system we  have ability to choose the level/scope where this event
will be handled.

If language has well defined and constructed   exceptions
mechanism  without much overhead then there is nothing
wrong in using exceptions as condition signals or events.

Regards,
Vladimir Olensky