Re: [boost] Math constants for naive and gurus? - which constantsdo you want?

From: Greg Colvin (gcolvin_at_[hidden])
Date: 2001-10-24 13:06:54

From: Lyell E. Haynes <fizban_at_[hidden]>

> Why not use a typedef approach, similar to std::string =
> std::basic_string<char>?
> 
> Then we could have:
> 
> typedef constant<pi_tag, double> pi

Excellent suggestion.  Thanks.

> and in you code, you can either write:
> v = pi; or
> v = constant<pi_tag, double>
> 
> Then you get the template approach as well as ease of typing. Has this
> already been suggested, and I just missed it?
> 
> Lyell "lurker" Haynes
> 
> On Wed, 24 Oct 2001, Greg Colvin wrote:
> 
> > From: Beman Dawes <bdawes_at_[hidden]>
> > > At 05:14 PM 10/23/01 -0600, Greg Colvin wrote:
> > >
> > >  >The only problems I see with the template function approach is
> > >  >the extra typing:
> > >  >
> > >  >    v = pi
> > >  >
> > >  >is certainly easier than
> > >  >
> > >  >    v = constant<pi_tag,double>
> > >  >
> > >  >but it is not amenable to more precise implementations.
> > >  >
> > >  >How about a compromise:
> > >  >
> > >  >    v = pi<double>()
> > >  >
> > >  >and so on for all the other constants?  I think this can be
> > >  >made to work with even the most brain-dead compilers.
> > >
> > > Please do not make any design decisions for math constants based on
> > > brain-dead compilers.
> >
> > OK.  But I still prefer pi<double> to constant<pi_tag,double>, so I
> > was compromising on the interface.
> >
> > > I'm writing this from the C++ committee meeting.  Compiler vendor after
> > > compiler vendor is stating publicly that the Boost libraries have become so
> > > important that they are being added to the vendor's regression tests.
> > > Customers are demanding that 100% of the tests pass. The critical mass
> > > demand we all dreamed about actually seems to be happening.
> >
> > Excellent.
> >
> >
> > > The exact form of the constants will be very, very important in user
> > > decisions to use the library, and committee decisions to add the library to
> > > the C++ standard.  Please don't make compromises for broken compilers.
> > >
> > > --Beman
> > >
> > >
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