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libstdc++: Add __cpp_lib_unwrap_ref feature test macro

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We already defined the traits in <type_traits> as now required by LWG
3348, but the macro was missing. This adds it.

	* include/std/type_traits (__cpp_lib_unwrap_ref): Define (LWG 3348).
	* include/std/version (__cpp_lib_unwrap_ref): Likewise.
	* testsuite/20_util/unwrap_reference/1.cc: Check macro.
	* testsuite/20_util/unwrap_reference/3.cc: New test.
This commit is contained in:
Jonathan Wakely 2020-02-19 15:06:24 +00:00
parent 5f031f9747
commit bb54e0b879
5 changed files with 41 additions and 0 deletions
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5
libstdc++-v3/ChangeLog
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@ -1,5 +1,10 @@
2020-02-19 Jonathan Wakely <jwakely@redhat.com>
* include/std/type_traits (__cpp_lib_unwrap_ref): Define (LWG 3348).
* include/std/version (__cpp_lib_unwrap_ref): Likewise.
* testsuite/20_util/unwrap_reference/1.cc: Check macro.
* testsuite/20_util/unwrap_reference/3.cc: New test.
* include/std/numeric (midpoint(T8, T*)): Do not check for complete
type during overload resolution, use static assert instead (LWG 3200).
* testsuite/26_numerics/midpoint/pointer.cc: Do not test with

2
libstdc++-v3/include/std/type_traits
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@ -3242,6 +3242,8 @@ template <typename _From, typename _To>
template<typename _Tp>
using type_identity_t = typename type_identity<_Tp>::type;
#define __cpp_lib_unwrap_ref 201811L
/// Unwrap a reference_wrapper
template<typename _Tp>
struct unwrap_reference { using type = _Tp; };

1
libstdc++-v3/include/std/version
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@ -178,6 +178,7 @@
#ifdef _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED
# define __cpp_lib_is_constant_evaluated 201811L
#endif
#define __cpp_lib_unwrap_ref 201811L
#if _GLIBCXX_HOSTED
#define __cpp_lib_bind_front 201907L

6
libstdc++-v3/testsuite/20_util/unwrap_reference/1.cc
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@ -20,6 +20,12 @@
#include <type_traits>
#ifndef __cpp_lib_unwrap_ref
# error "Feature-test macro for unwrap_reference missing in <type_traits>"
#elif __cpp_lib_unwrap_ref != 201811L
# error "Feature-test macro for unwrap_reference has wrong value in <type_traits>"
#endif
template<typename T, typename U> struct expect_same;
template<typename T> struct expect_same<T, T> : std::true_type { };

27
libstdc++-v3/testsuite/20_util/unwrap_reference/3.cc Normal file
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@ -0,0 +1,27 @@
// Copyright (C) 2020 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do compile { target c++2a } }
#include <version>
#ifndef __cpp_lib_unwrap_ref
# error "Feature-test macro for unwrap_reference missing in <version>"
#elif __cpp_lib_unwrap_ref != 201811L
# error "Feature-test macro for unwrap_reference has wrong value in <version>"
#endif