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[PATCH] PR libstdc++/84928 use std::move in <numeric> algorithms

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: Fri, 6 Jul 2018 15:16:07 +0100
Subject: [PATCH] PR libstdc++/84928 use std::move in <numeric> algorithms

P0616R0 altered the effects of the <numeric> algorithms to use std::move
on the accumulator values (resolving LWG 2055). This implements the
change for C++2a, but retains the previous behaviour for older
standards.

	* include/bits/stl_numeric.h (_GLIBCXX_MOVE_IF_20): Define macro to
	conditionally move, according to __cplusplus value.
	(accumulate, inner_product, partial_sum, adjacent_difference): Use
	_GLIBCXX_MOVE_IF_20.
	* testsuite/26_numerics/accumulate/lwg2055.cc: New test.
	* testsuite/26_numerics/adjacent_difference/lwg2055.cc: New test.
	* testsuite/26_numerics/inner_product/lwg2055.cc: New test.
	* testsuite/26_numerics/partial_sum/lwg2055.cc: New test.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

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