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[PATCH] Replace non-constexpr decrement in std::chrono::floor

From: Jonathan Wakely <jwakely at redhat dot com>
To: libstdc++ at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
Date: Thu, 13 Oct 2016 15:24:59 +0100
Subject: [PATCH] Replace non-constexpr decrement in std::chrono::floor
Authentication-results: sourceware.org; auth=none

Decrementing a duration is not constexpr (yet ... I made an NB comment
about it).

I'm not sure if these functions are correct for floating-point
durations, because we could end up with a duration which is very very
slightly lower of higher than the desired value, but then we subtract
1.0 from it. That's what the reference implementation in Howard's
proposal does, so I'll worry about it another day.

	* include/std/chrono (floor): Replace non-constexpr operation.
	* testsuite/20_util/duration_cast/rounding.cc: Test conversion to
	durations with floating pointer representations.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

Follow-Ups:
- Re: [PATCH] Replace non-constexpr decrement in std::chrono::floor
  - From: Jonathan Wakely

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