[boost] Re: Boost Integer Library

From: Greg Colvin (gcolvin_at_[hidden])
Date: 1999-08-17 14:26:26

From: Valentin Bonnard <Bonnard.V_at_[hidden]>
> Greg Colvin wrote:
> > 
> > From: Valentin Bonnard <Bonnard.V_at_[hidden]>
> > > Greg Colvin wrote:
> > > >
> > > > > Greg Colvin wrote:
> > > > >
> > > > > > > Minor issues:
> > > > > >
> > > > > > This may be just a clarification, but what should be the value of
> > > > > > integer_traits<int32_t>::const_max?  2147483647?
> > > > >
> > > > > What could it be, except 2147483647 = 2**31-1 ?
> > > >
> > > > On a 36 bit machine?
> > >
> > > Of course. int32_t has 32 bits.
> > 
> > So it is undefined on systems with no 32 bit type?

So I take the answer to this question is yes, and int32_t is not
a portable type.

> > Maybe I'm being dense, but I thought that int32_t was just a typedef for a
> > big enough type for 32 bits.
> 
> You are describing int_least32_t. int32_t has exactly 32 bits.
> 
> > So on a twos-complement 36 bit machine we might have
> > 
> >     typedef int int32_t;
> 
> We might not.
> 
> > in which case integer_traits<int32_t>::const_max would have to be 2**35-1.
> 
> No
> 
> -- 
> 
> Valentin Bonnard
> 
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