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libstdc++: Implementing P0767 - deprecate POD

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This adds the deprecated attribute to std::is_pod and std::is_pod_v for
C++20.

2019-12-05  JeanHeyd "ThePhD" Meneide  <phdofthehouse@gmail.com>

	* include/bits/c++config (_GLIBCXX20_DEPRECATED): Add new macro.
	* include/std/type_traits (is_pod, is_pod_v): Deprecate for C++20.
	* testuite/20_util/is_pod/deprecated-2a.cc: New test.

From-SVN: r280065
This commit is contained in:
JeanHeyd "ThePhD" Meneide 2020-01-09 21:31:43 +00:00 committed by Jonathan Wakely
parent ab3a095c4b
commit 1a6c5064f9
4 changed files with 44 additions and 2 deletions
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6
libstdc++-v3/ChangeLog
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@ -1,3 +1,9 @@
2020-01-09 JeanHeyd "ThePhD" Meneide <phdofthehouse@gmail.com>
* include/bits/c++config (_GLIBCXX20_DEPRECATED): Add new macro.
* include/std/type_traits (is_pod, is_pod_v): Deprecate for C++20.
* testuite/20_util/is_pod/deprecated-2a.cc: New test.
2020-01-09 Jonathan Wakely <jwakely@redhat.com>
PR libstdc++/93205

7
libstdc++-v3/include/bits/c++config
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@ -78,6 +78,7 @@
// _GLIBCXX_USE_DEPRECATED
// _GLIBCXX_DEPRECATED
// _GLIBCXX17_DEPRECATED
// _GLIBCXX20_DEPRECATED( string-literal )
#ifndef _GLIBCXX_USE_DEPRECATED
# define _GLIBCXX_USE_DEPRECATED 1
#endif
@ -94,6 +95,12 @@
# define _GLIBCXX17_DEPRECATED
#endif
#if defined(__DEPRECATED) && (__cplusplus > 201703L)
# define _GLIBCXX20_DEPRECATED(MSG) [[deprecated(MSG)]]
#else
# define _GLIBCXX20_DEPRECATED(MSG)
#endif
// Macros for ABI tag attributes.
#ifndef _GLIBCXX_ABI_TAG_CXX11
# define _GLIBCXX_ABI_TAG_CXX11 __attribute ((__abi_tag__ ("cxx11")))

7
libstdc++-v3/include/std/type_traits
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@ -685,10 +685,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
"template argument must be a complete class or an unbounded array");
};
/// is_pod
/// is_pod (deprecated in C++20)
// Could use is_standard_layout && is_trivial instead of the builtin.
template<typename _Tp>
struct is_pod
struct
_GLIBCXX20_DEPRECATED("use is_standard_layout && is_trivial instead")
is_pod
: public integral_constant<bool, __is_pod(_Tp)>
{
static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
@ -3078,6 +3080,7 @@ template <typename _Tp>
template <typename _Tp>
inline constexpr bool is_standard_layout_v = is_standard_layout<_Tp>::value;
template <typename _Tp>
_GLIBCXX20_DEPRECATED("use is_standard_layout_v && is_trivial_v instead")
inline constexpr bool is_pod_v = is_pod<_Tp>::value;
template <typename _Tp>
inline constexpr bool is_literal_type_v = is_literal_type<_Tp>::value;

26
libstdc++-v3/testsuite/20_util/is_pod/deprecated-2a.cc Normal file
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@ -0,0 +1,26 @@
// 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 <type_traits>
static_assert(std::is_pod<int>::value); // { dg-warning "is deprecated" }
static_assert(std::is_pod_v<int>); // { dg-warning "is deprecated" }
// { dg-prune-output "declared here" }