libstdc++-v3/include/std/memory

   1 // <memory> -*- C++ -*-
   2
   3 // Copyright (C) 2001-2023 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 /*
  26  * Copyright (c) 1997-1999
  27  * Silicon Graphics Computer Systems, Inc.
  28  *
  29  * Permission to use, copy, modify, distribute and sell this software
  30  * and its documentation for any purpose is hereby granted without fee,
  31  * provided that the above copyright notice appear in all copies and
  32  * that both that copyright notice and this permission notice appear
  33  * in supporting documentation.  Silicon Graphics makes no
  34  * representations about the suitability of this software for any
  35  * purpose.  It is provided "as is" without express or implied warranty.
  36  *
  37  */
  38
  39 /** @file include/memory
  40  *  This is a Standard C++ Library header.
  41  *  @ingroup memory
  42  */
  43
  44 #ifndef _GLIBCXX_MEMORY
  45 #define _GLIBCXX_MEMORY 1
  46
  47 #pragma GCC system_header
  48
  49 /**
  50  * @defgroup memory Memory
  51  * @ingroup utilities
  52  *
  53  * Components for memory allocation, deallocation, and management.
  54  */
  55
  56 /**
  57  * @defgroup pointer_abstractions Pointer Abstractions
  58  * @ingroup memory
  59  *
  60  * Smart pointers, etc.
  61  */
  62
  63 #include <bits/memoryfwd.h>
  64 #if _GLIBCXX_HOSTED
  65 # include <bits/allocator.h>
  66 # include <bits/stl_tempbuf.h>
  67 #endif
  68 #include <bits/stl_construct.h>
  69 #include <bits/stl_uninitialized.h>
  70 #include <bits/stl_raw_storage_iter.h>
  71
  72 #if __cplusplus >= 201103L
  73 #  include <type_traits>
  74 #  include <bits/align.h>
  75 #  include <bits/uses_allocator.h>
  76 #  include <bits/alloc_traits.h>
  77 #  include <debug/debug.h>
  78 #  include <bits/unique_ptr.h>
  79 # if _GLIBCXX_HOSTED
  80 #  include <bits/shared_ptr.h>
  81 #  include <bits/shared_ptr_atomic.h>
  82 # endif
  83 #endif
  84
  85 #if __cplusplus < 201103L || _GLIBCXX_USE_DEPRECATED
  86 #  include <backward/auto_ptr.h>
  87 #endif
  88
  89 #if __cplusplus > 201703L
  90 #  include <bits/ranges_uninitialized.h>
  91 #  include <bits/uses_allocator_args.h>
  92 #endif
  93
  94 #if __cplusplus >= 201103L && __cplusplus <= 202002L && _GLIBCXX_HOSTED
  95 namespace std _GLIBCXX_VISIBILITY(default)
  96 {
  97 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  98
  99 /** @defgroup ptr_safety Pointer Safety and Garbage Collection
 100  *  @ingroup memory
 101  *
 102  * Utilities to assist with garbage collection in an implementation
 103  * that supports <em>strict pointer safety</em>.
 104  * This implementation only supports <em>relaxed pointer safety</em>
 105  * and so these functions have no effect.
 106  *
 107  * C++11 20.6.4 [util.dynamic.safety], Pointer safety
 108  *
 109  * @{
 110  */
 111
 112 /// Constants representing the different types of pointer safety.
 113 enum class pointer_safety { relaxed, preferred, strict };
 114
 115 /// Inform a garbage collector that an object is still in use.
 116 inline void
 117 declare_reachable(void*) { }
 118
 119 /// Unregister an object previously registered with declare_reachable.
 120 template <typename _Tp>
 121   inline _Tp*
 122   undeclare_reachable(_Tp* __p) { return __p; }
 123
 124 /// Inform a garbage collector that a region of memory need not be traced.
 125 inline void
 126 declare_no_pointers(char*, size_t) { }
 127
 128 /// Unregister a range previously registered with declare_no_pointers.
 129 inline void
 130 undeclare_no_pointers(char*, size_t) { }
 131
 132 /// The type of pointer safety supported by the implementation.
 133 inline pointer_safety
 134 get_pointer_safety() noexcept { return pointer_safety::relaxed; }
 135 /// @}
 136
 137 _GLIBCXX_END_NAMESPACE_VERSION
 138 } // namespace
 139 #endif // C++11 to C++20
 140
 141 #if __cplusplus >= 201703L && _GLIBCXX_HOSTED
 142 // Parallel STL algorithms
 143 # if _PSTL_EXECUTION_POLICIES_DEFINED
 144 // If <execution> has already been included, pull in implementations
 145 #  include <pstl/glue_memory_impl.h>
 146 # else
 147 // Otherwise just pull in forward declarations
 148 #  include <pstl/glue_memory_defs.h>
 149 # endif
 150
 151 // Feature test macro for parallel algorithms
 152 # define __cpp_lib_parallel_algorithm 201603L
 153 #endif // C++17
 154
 155 #endif /* _GLIBCXX_MEMORY */