primitive value overflow

[Marco Leise]

Am Fri, 17 May 2013 14:43:08 -0300
schrieb Ary Borenszweig <ary at esperanto.org.ar>:

> On 5/16/13 5:24 PM, luka8088 wrote:
> > Hello everyone.
> >
> > Today I ran into a interesting issue. I wrote
> >
> >    auto offset = text1.length - text2.length;
> >
> > and in case text2 was longer then text1 I got something around 4294967291.
> >
> > So I opened an issue:
> > http://d.puremagic.com/issues/show_bug.cgi?id=10093
> >
> > I know that there is a perfectly valid reason for this behavior, and
> > that this behavior is not undefined, but it is unexpected, especially
> > because unsigned is never mentioned in the code. One solution that comes
> > to mind is changing length to signed, but that makes no sense because
> > length is never negative.
> 
> It makes sense if you don't want to have these subtle bugs in your 
> programming language -.-

Just saying: the subtraction of two integers creates a
resulting range that doesn't fit in ANY integer of same size.
If you want to be safe disallow subtraction -.-

-- 
Marco