Jonathan Wakely 74fda2dc9f Fix value category bugs in std::reduce
* include/std/numeric (reduce(Iter, Iter, T, BinOp)): Fix value
	category used in invocable check.
	(reduce(Iter, Iter, T)): Pass initial value as rvalue.
	* testsuite/26_numerics/reduce/2.cc: New test.

From-SVN: r272477
2019-06-19 16:29:49 +01:00
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