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From: Tucker Taft <stt@averstar.com>
Subject: Re: Ada and Java. different behaviour. casting long to int problem.
Date: 1999/06/17
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Date: 1999-06-17T00:00:00+00:00
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George W. Bayles wrote:
> 
> Tucker Taft wrote:
> >
> [snip]
> > The compiler can emit code to explicitly check the overflow condition
> > (when needed), whereas the programmer may not have any easy or
> > efficient way of writing such a check in the high-level language.
> >
> > > int a,b,c;
> > > ....
> > > a = b + c;
> > > boolean overflowed = (c<0) ? (a>b) : (a<b);
> > >
> > > [snip]
> >
> Huh? This high level overflow check may not be terribly efficient but
> it is easy enough.

It is straightforward if all you have is an assignment with
a single operation.  However, potentially-overflowing arithmetic
can occur anywhere, including in things like "i++" where significant
rewriting would be required to insert a check.
So that is what I meant by saying it was not "easy."
I presume you agree with the efficiency issue.

> 
> [snip]

-- 
-Tucker Taft   stt@averstar.com   http://www.averstar.com/~stt/
Technical Director, Distributed IT Solutions  (www.averstar.com/tools)
AverStar (formerly Intermetrics, Inc.)   Burlington, MA  USA