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02926c0abb
Implement proposals adopted for C++23: P0401R6, "Providing size feedback in the Allocator interface" P2652R2, "Disallow User Specialization of allocator_traits". This is the minimal conforming implementation, i.e. without the useful parts. Useful parts, to come in future patches, would include giving access to any extra storage reserved, and use of it in vector, string, and other contiguous containers. libstdc++-v3/ChangeLog: PR libstdc++/118030 * include/bits/alloc_traits.h (allocate_at_least (2x)): Define. * include/bits/allocator.h (allocate_at_least): Define. * include/std/memory (__glibcxx_want_allocate_at_least): Define. * include/bits/memoryfwd.h (allocation_result): Define, #include <bits/version.h> first so that will work. * include/bits/version.def (allocate_at_least): Add. * include/bits/version.h: Regenerate. * testsuite/20_util/allocator/allocate_at_least.cc: New test. * testsuite/20_util/allocator/allocate_at_least_neg.cc: New test.
190 lines
5.7 KiB
C++
190 lines
5.7 KiB
C++
// <memory> -*- C++ -*-
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// Copyright (C) 2001-2026 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) 1997-1999
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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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*/
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/** @file include/memory
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* This is a Standard C++ Library header.
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* @ingroup memory
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*/
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#ifndef _GLIBCXX_MEMORY
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#define _GLIBCXX_MEMORY 1
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#ifdef _GLIBCXX_SYSHDR
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#pragma GCC system_header
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#endif
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/**
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* @defgroup memory Memory
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* @ingroup utilities
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*
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* Components for memory allocation, deallocation, and management.
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*/
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/**
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* @defgroup pointer_abstractions Pointer Abstractions
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* @ingroup memory
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*
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* Smart pointers, etc.
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*/
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#include <bits/memoryfwd.h>
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#if _GLIBCXX_HOSTED
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# include <bits/allocator.h>
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# include <bits/stl_tempbuf.h>
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#endif
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#include <bits/stl_construct.h>
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#include <bits/stl_uninitialized.h>
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#include <bits/stl_raw_storage_iter.h>
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#if __cplusplus >= 201103L
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# include <type_traits>
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# include <bits/align.h>
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# include <bits/uses_allocator.h>
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# include <bits/alloc_traits.h>
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# include <debug/debug.h>
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# include <bits/unique_ptr.h>
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# if _GLIBCXX_HOSTED
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# include <bits/shared_ptr.h>
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# include <bits/shared_ptr_atomic.h>
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# endif
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#endif
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#if __cplusplus < 201103L || _GLIBCXX_USE_DEPRECATED
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# include <backward/auto_ptr.h>
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#endif
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#if __cplusplus > 201703L
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# include <bits/ranges_uninitialized.h>
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# include <bits/uses_allocator_args.h>
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#endif
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#if __cplusplus > 202002L
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# include <bits/out_ptr.h>
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#endif
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#if __cplusplus > 202302L
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# include <bits/indirect.h>
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#endif
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#define __glibcxx_want_addressof_constexpr
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#define __glibcxx_want_algorithm_iterator_requirements
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#define __glibcxx_want_allocator_traits_is_always_equal
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#define __glibcxx_want_assume_aligned
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#define __glibcxx_want_atomic_shared_ptr
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#define __glibcxx_want_atomic_value_initialization
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#define __glibcxx_want_constexpr_dynamic_alloc
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#define __glibcxx_want_constexpr_memory
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#define __glibcxx_want_enable_shared_from_this
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#define __glibcxx_want_indirect
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#define __glibcxx_want_is_sufficiently_aligned
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#define __glibcxx_want_make_unique
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#define __glibcxx_want_out_ptr
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#define __glibcxx_want_parallel_algorithm
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#define __glibcxx_want_polymorphic
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#define __glibcxx_want_ranges
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#define __glibcxx_want_raw_memory_algorithms
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#define __glibcxx_want_shared_ptr_arrays
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#define __glibcxx_want_shared_ptr_weak_type
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#define __glibcxx_want_smart_ptr_for_overwrite
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#define __glibcxx_want_start_lifetime_as
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#define __glibcxx_want_to_address
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#define __glibcxx_want_transparent_operators
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#define __glibcxx_want_smart_ptr_owner_equality
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#define __glibcxx_want_allocate_at_least
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#include <bits/version.h>
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#if __cplusplus >= 201103L && __cplusplus <= 202002L && _GLIBCXX_HOSTED
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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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/** @defgroup ptr_safety Pointer Safety and Garbage Collection
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* @ingroup memory
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*
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* Utilities to assist with garbage collection in an implementation
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* that supports <em>strict pointer safety</em>.
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* This implementation only supports <em>relaxed pointer safety</em>
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* and so these functions have no effect.
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*
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* C++11 20.6.4 [util.dynamic.safety], Pointer safety
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*
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* @{
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*/
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/// Constants representing the different types of pointer safety.
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enum class pointer_safety { relaxed, preferred, strict };
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/// Inform a garbage collector that an object is still in use.
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inline void
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declare_reachable(void*) { }
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/// Unregister an object previously registered with declare_reachable.
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template <typename _Tp>
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inline _Tp*
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undeclare_reachable(_Tp* __p) { return __p; }
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/// Inform a garbage collector that a region of memory need not be traced.
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inline void
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declare_no_pointers(char*, size_t) { }
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/// Unregister a range previously registered with declare_no_pointers.
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inline void
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undeclare_no_pointers(char*, size_t) { }
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/// The type of pointer safety supported by the implementation.
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inline pointer_safety
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get_pointer_safety() noexcept { return pointer_safety::relaxed; }
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/// @}
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#endif // C++11 to C++20
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#ifdef __cpp_lib_parallel_algorithm // C++ >= 17 && HOSTED
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// Parallel STL algorithms
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# if _PSTL_EXECUTION_POLICIES_DEFINED
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// If <execution> has already been included, pull in implementations
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# include <pstl/glue_memory_impl.h>
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# else
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// Otherwise just pull in forward declarations
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# include <pstl/glue_memory_defs.h>
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# endif
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#endif // __cpp_lib_parallel_algorithm
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#endif /* _GLIBCXX_MEMORY */
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