Re: [boost] Re: Re: Proposed addition: sign_triats and [un]signed_cast

From: Victor A. Wagner, Jr. (vawjr_at_[hidden])
Date: 2002-09-12 03:32:21

At Thursday 2002/09/12 01:06, you wrote:
>"Jeffrey C. Jacobs" wrote:
> >
> > Oh!  Good point, thanks Daniel!  Consider it done:
> >
> > const volatile Integral &_T
> >
> > Of course, a const volatile (or volatile const) anything is effectively
> > saying: this value doesn't change but assume it changes frequently (don't
> > cache it),

no, it's saying "_I_ won't change it, but it may change by something you 
can't see" (like the other threads)

>so although as a completist I will support it, from a language
> > POV it's sort of like saying:
> >
> > Integral & const _T
>
>Of course the & is always fixed, the 'const' and 'volatile' refer to the
>type you are refering. Using both 'const' and 'volatile' is AFAIK a
>useful thing as it says that *your* code will not change it, but another
>thread could (or if it's a hardware register etc.). This prevents the
>compiler from optimizing certain things away like moving the 'reading'
>of the variable out of a loop or removing code paths that otherwise
>would never be taken.
>
>Regards, Daniel
>
>--
>Daniel Frey
>
>aixigo AG - financial training, research and technology
>Schloß-Rahe-Straße 15, 52072 Aachen, Germany
>fon: [phone], fax: [phone]
>eMail: daniel.frey_at_[hidden], web: http://www.aixigo.de
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Victor A. Wagner Jr.      http://rudbek.com
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