Re: [boost] Re: Math constants - updated.

From: John Maddock (john_at_[hidden])
Date: 2005-05-08 05:05:09

>> Static constants in "<type>_constants"-namespaces are also undesirable, 
>> because there is no way to select a namespace named "<T>_constants" from 
>> within a template.
>
> FWIW thi would work fine for me:
>
>    typedef  std::math::constants<T> math;
>     2 * math::pi * r ;

Except you can't then add new constants without changing the definition of 
math_constants.  If you use a namespace for the "container" and 
free-standing template functions, then you can either:

Add new constants.
Add support for new types.

Without changing the existing code.

John.