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Re: [PATCH] C++ math constants

From: Oleg Endo <oleg dot endo at t-online dot de>
To: Alec Teal <a dot teal at warwick dot ac dot uk>
Cc: Ulrich Drepper <drepper at gmail dot com>, "libstdc++ at gcc dot gnu dot org" <libstdc++ at gcc dot gnu dot org>, GCC Patches <gcc-patches at gcc dot gnu dot org>
Date: Thu, 21 Feb 2013 20:06:02 +0100
Subject: Re: [PATCH] C++ math constants
References: <CAOPLpQdxQkFcUb6-us3gdzesTwx8MyzxccF_TTZvO3=E0A1xsw@mail.gmail.com> <5126560E.4070104@warwick.ac.uk>

On Thu, 2013-02-21 at 17:14 +0000, Alec Teal wrote:
> On 21/02/13 16:32, Ulrich Drepper wrote:
> > How about the attached file as a start for <ext/math>.  I used the
> > constexpr approach (instead of function calls) and replicated the
> > constants that are available in <math.h> in Unix.
> >
> > What other constants to add?
> Pi/3

> 1/e
> 

I'm wondering, why adding constants for these if the compiler can figure
it out from e.g. "math::pi/3" (or whatever the namespace is)?

> ln(3)
> ln(10) (for base conversions)
> sqrt(3)
> sqrt(5)
> sqrt(7)

Aren't these evaluated by the compiler and converted to constants?

Cheers,
Oleg

Follow-Ups:
- Re: [PATCH] C++ math constants
  - From: Jakub Jelinek

References:
- [PATCH] C++ math constants
  - From: Ulrich Drepper
- Re: [PATCH] C++ math constants
  - From: Alec Teal

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