5e3a1ea3d8
The changes in 75c6a925da were slightly
incorrect, because the converting constructor should be noexcept, and
the POCMA and is_always_equal traits should still be present in C++20.
This fixes it, and slightly refactors the preprocessor conditions and
order of members. Also add comments explaining things.
The non-standard construct and destroy members added for PR 78052 can be
private if allocator_traits<allocator<void>> is made a friend.
libstdc++-v3/ChangeLog:
* include/bits/allocator.h (allocator<void>) [C++20]: Add
missing noexcept to constructor. Restore missing POCMA and
is_always_equal_traits.
[C++17]: Make construct and destroy members private and
declare allocator_traits as a friend.
* include/bits/memoryfwd.h (allocator_traits): Declare.
* include/ext/malloc_allocator.h (malloc_allocator::allocate):
Add nodiscard attribute. Add static assertion for LWG 3307.
* include/ext/new_allocator.h (new_allocator::allocate): Add
static assertion for LWG 3307.
* testsuite/20_util/allocator/void.cc: Check that converting
constructor is noexcept. Check for propagation traits and
size_type and difference_type. Check that pointer and
const_pointer are gone in C++20.
84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
// <memory> Forward declarations -*- C++ -*-
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// Copyright (C) 2001-2021 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/*
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* Copyright (c) 1996-1997
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* Silicon Graphics Computer Systems, Inc.
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*/
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/** @file bits/memoryfwd.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{memory}
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*/
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#ifndef _MEMORYFWD_H
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#define _MEMORYFWD_H 1
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#pragma GCC system_header
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#include <bits/c++config.h>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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/**
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* @defgroup allocators Allocators
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* @ingroup memory
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*
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* Classes encapsulating memory operations.
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*
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* @{
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*/
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template<typename>
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class allocator;
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template<>
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class allocator<void>;
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#if __cplusplus >= 201103L
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/// Declare uses_allocator so it can be specialized in `<queue>` etc.
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template<typename, typename>
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struct uses_allocator;
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template<typename>
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struct allocator_traits;
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#endif
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/// @} group memory
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace std
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#endif
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