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Subject: Re: [boost] [numeric_limits] min() for floating point versus integers (Was: [xint] Third release is ready, requesting preliminary review)
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2010-05-04 07:44:56

DE wrote:
> Stewart, Robert wrote :
> > Frank Mori Hess wrote:
> >>
> >> Speaking of numeric_limits, anyone know why they defined
> >> numeric_limits::min()
> >> to mean something completely different for floating and
> >> integer types?
> >>
> >> numeric_limits<double>::min is: 2.22507e-308
> >> numeric_limits<int>::min is: -2147483648
> > That is a pain, isn't it? I can only assume it was to avoid adding
> > yet more attributes. (You'd need biggest, smallest, maximum, and
> > minimum, or some such set to express everything.) Floating point
> > types don't have asymmetrical ranges like integral types.
> not that much
> typedef std::numeric_limits<type> traits;
> const type realy_min = traits::is_integer ? traits::min() :
> -traits::max();

That only works for unsigned types.

Rob Stewart robert.stewart_at_[hidden]
Software Engineer, Core Software using std::disclaimer;
Susquehanna International Group, LLP

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