Re: [boost] Re: TODAY: Math Constants library formal review starts

From: boost (boost_at_[hidden])
Date: 2001-04-19 05:39:56

Salut,

On Thursday 19 April 2001 00:00, you wrote:
[...]
> - Naively I was expecting something like:
>
>   namespace boost {
>     namespace math {
>       namespace F {
>         const float pi = 3.14159265358979323846264338327950288F;
>         //...
>       }
>       namespace D {
>         const double pi = 3.14159265358979323846264338327950288;
>         //...
>       }
>       namespace L {
>         const long double pi = 3.14159265358979323846264338327950288L;
>         //...
>       }
>       template <typename T> // just for the idea, details might need
> work
>       pi(const T&) { return boost::math::L::pi; }
>       //...
>     }
>   }
[...]
I would prefer this too, without any macros.
Maybe one should spend a few letters, sinf L could also refer to long int,
e.g. namespace Float{ ...

or 

.h:

using namespace std;

namespace boost
{
    namespace math
    {
        template <typename T>  class Constants
        {
                static const T pi;
                static const T e;
        };
    }
};

const double boost::math::Constants<double>::pi = 3.1415;
const interval<double> 
         boost::math::Constants<interval<double> >::pi = ( 3.1415, 0.0001);

In addition,  dear  Paul Bristow,

#define BOOST_CF 1.03064083410071293588177609411693684L /* Continued fraction 
(base 10) */

could you please explain this constant.

Best wishes
Peter