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[PATCH] LWG 3074 make scalar types non-deduced in valarray non-member functions

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, 14 Jun 2018 20:36:45 +0100
Subject: [PATCH] LWG 3074 make scalar types non-deduced in valarray non-member functions

The committee approved this change last week, so thatoperations combining scalars and valarrays work as long as the scalar

is convertible to the valarray's value_type, instead of failing
argument deduction when the types differ.

While testing this I discovered we didn't have any tests for these
operations, so I added some.

	* include/bits/valarray_after.h (_DEFINE_EXPR_BINARY_FUNCTION): Change
	scalar parameters to be a non-deduced context.
	* include/std/valarray (_DEFINE_BINARY_OPERATOR): Likewise. Adjust
	whitespace.
	* testsuite/26_numerics/valarray/operators.cc: Test scalar operands.
	* testsuite/26_numerics/valarray/transcend.cc: New.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

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