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[PATCH] PR libstdc++/81912 make std::__iterator_category constexpr

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, 21 Aug 2017 16:17:19 +0100
Subject: [PATCH] PR libstdc++/81912 make std::__iterator_category constexpr
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We made the interator range access functions constexpr for C++17, but
didn't test it, and so didn't notice that std::__iterator_category
isn't constexpr. This fixes it, and improve tests a bit.

	PR libstdc++/81912
	* include/bits/stl_iterator_base_types.h (__iterator_category): Add
	constexpr for C++11 and later.
	* testsuite/24_iterators/container_access.cc: Add target selector.
	* testsuite/24_iterators/range_access.cc: Fix clause number in
	comment.
	* testsuite/24_iterators/range_access_cpp14.cc: Likewise.
	* testsuite/24_iterators/range_access_cpp17.cc: New.

Tested x86_64-linux, committed to trunk. Will backport to gcc-7-branch
too.

Attachment: patch.txt
Description: Text document

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