Re: [boost] Is there interest in portable integer overflow detection, with policy based handling?

Subject: Re: [boost] Is there interest in portable integer overflow detection, with policy based handling?
From: Ben Robinson (cppmaven_at_[hidden])
Date: 2012-02-22 13:40:59

On Wed, Feb 22, 2012 at 9:38 AM, Robert Ramey <ramey_at_[hidden]> wrote:

> Ben Robinson wrote:
>
> > Overflow (positive and negative) are not possible with division and
> > modulus.
>
> hmmm - what happens when an unsigned integer is divided by a
> negative number?  Doesn't this overflow or something?
>
> A positive whole number divided by a negative whole number is a negative
value which is smaller in magnitude than the original numerator.  With
integers, truncation of the fractional part may be involved, but this is
not overflow.  Integers can only overflow in the positive and negative
direction.  That is not the same as underflow, which floating point numbers
can do.

Thank you,

Ben Robinson

Robert Ramey
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