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Re: [PATCH] Implement "P0631R4 Math Constants" for C++20

From: Marc Glisse <marc dot glisse at inria dot fr>
To: Jonathan Wakely <jwakely at redhat dot com>
Cc: libstdc++ at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
Date: Wed, 31 Jul 2019 19:07:03 +0200 (CEST)
Subject: Re: [PATCH] Implement "P0631R4 Math Constants" for C++20
References: <20190731163944.GA18423@redhat.com>
Reply-to: libstdc++ at gcc dot gnu dot org

On Wed, 31 Jul 2019, Jonathan Wakely wrote:

The values of the constants are taken from Glibc where the equivalent
constant exists, or by rounding the actual constant to the same number
of digits as the Glibc constants have.

How does it behave with __float128? I think that with -std=gnu++2a, itcounts as a floating point type, but the constant first becomes a longdouble and thus loses precision.


--
Marc Glisse

Follow-Ups:
- Re: [PATCH] Implement "P0631R4 Math Constants" for C++20
  - From: Jonathan Wakely

References:
- [PATCH] Implement "P0631R4 Math Constants" for C++20
  - From: Jonathan Wakely

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