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[PATCH] Add noexcept to shared_ptr owner comparisons (LWG 2873)

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: Mon, 5 Jun 2017 10:34:23 +0100
Subject: [PATCH] Add noexcept to shared_ptr owner comparisons (LWG 2873)
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C++17 requires these to be noexcept, and there's no reason not to do
it for earlier standard modes too.

	* include/bits/shared_ptr_base.h (__shared_ptr::owner_before)
	(__weak_ptr::owner_before, _Sp_owner_less::operator()): Add noexcept
	specifiers as per LWG 2873 and LWG 2942.
	* testsuite/20_util/owner_less/noexcept.cc: New.
	* testsuite/20_util/shared_ptr/observers/owner_before.cc: Test
	noexcept guarantees.
	* testsuite/20_util/weak_ptr/observers/owner_before.cc: Likewise.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

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