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[PATCH] Use if-constexpr instead of overloading for customization point

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: Wed, 30 Oct 2019 17:42:23 +0000
Subject: [PATCH] Use if-constexpr instead of overloading for customization point

This combines two of the std::ranges::swap.operator() overloads into a
single function template. Using if-constexpr to choose between
implementations should give the compiler less work to do than using
overloading.

	* include/std/concepts (std::ranges::swap): Use a single overload for
	the non-array cases, and switch using if-constexpr.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

Follow-Ups:
- Re: [PATCH] Use if-constexpr instead of overloading for customization point
  - From: Jonathan Wakely

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