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[PATCH] Implement P0426R1 "Constexpr for std::char_traits" for C++17 (partial)

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, 3 Apr 2017 18:18:37 +0100
Subject: [PATCH] Implement P0426R1 "Constexpr for std::char_traits" for C++17 (partial)
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We can't fully implement this without compiler support (see PR80265)
but this adds _GLIBCXX17_CONSTEXPR where possible.

I've left /* _GLIBCXX17_CONSTEXPR */ comments where we need to add it
once the compiler allows it.

	* include/bits/char_traits.h (__gnu_cxx::char_traits): Add
	_GLIBCXX14_CONSTEXPR on assign, compare, find, and length.
	(std::char_traits<char>, std::char_traits<wchar_t>): Add
	_GLIBCXX17_CONSTEXPR on assign.
	(std::char_traits<char16_t>, std::char_traits<char32_t>): Add
	_GLIBCXX17_CONSTEXPR on assign, compare, find, and length.
	* testsuite/21_strings/char_traits/requirements/
	constexpr_functions_c++17.cc: New test.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

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