Re: [Boost-users] [numeric conversation] behavior on std::numeric_limits<double>::max() + eps with numeric_cast

16 Jun 2014


      Am 16.06.2014 16:24, schrieb Brandon Kohn:
...
...
so, I can't use it like boost.math.round
() with polycies or doubles,
isn't it?
I don't think it (numeric_cast) should be used to round doubles. For
On 6/16/2014 09:27 AM, Olaf Peter wrote:
that I would just call your rounder directly.
I wouldn't recommend this, but if you really wanted to use numeric_cast
due to other reasons, you could try specializing it for the double to
double case:
namespace boost
{
     template <>
     double numeric_cast(double value)
     {
         return boost::math::round(value);
     }
}
My idea was to write a mathematical value class which can operate on 
integers and floats using different rounding algorithms (hence 
numeric_cast<int>(double from_sqrt) etc. ) and switch statically this 
type to see later which better fits my needs. Initialized are this 
values from boost.units where doubles are preferred as underlying type. 
Probably I have to specialize this class for integers and floats.

Thanks,
Olaf