<h2>Editing File: /usr/include/c++/8/memory</h2><form method='post'><textarea name='content' class='file-edit'>// &lt;memory&gt; -*- C++ -*-

// Copyright (C) 2001-2018 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.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// &lt;http://www.gnu.org/licenses/&gt;.

/*
 * Copyright (c) 1997-1999
 * Silicon Graphics Computer Systems, Inc.
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Silicon Graphics makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided &quot;as is&quot; without express or implied warranty.
 *
 */

/** @file include/memory
 *  This is a Standard C++ Library header.
 */

#ifndef _GLIBCXX_MEMORY
#define _GLIBCXX_MEMORY 1

#pragma GCC system_header

/**
 * @defgroup memory Memory
 * @ingroup utilities
 *
 * Components for memory allocation, deallocation, and management.
 */

/**
 * @defgroup pointer_abstractions Pointer Abstractions
 * @ingroup memory
 *
 * Smart pointers, etc.
 */

#include &lt;bits/stl_algobase.h&gt;
#include &lt;bits/allocator.h&gt;
#include &lt;bits/stl_construct.h&gt;
#include &lt;bits/stl_uninitialized.h&gt;
#include &lt;bits/stl_tempbuf.h&gt;
#include &lt;bits/stl_raw_storage_iter.h&gt;

#if __cplusplus &gt;= 201103L
#  include &lt;exception&gt;        	  // std::exception
#  include &lt;typeinfo&gt;         	  // std::type_info in get_deleter
#  include &lt;iosfwd&gt;           	  // std::basic_ostream
#  include &lt;ext/atomicity.h&gt;
#  include &lt;ext/concurrence.h&gt;
#  include &lt;bits/functexcept.h&gt;
#  include &lt;bits/stl_function.h&gt;  // std::less
#  include &lt;bits/uses_allocator.h&gt;
#  include &lt;type_traits&gt;
#  include &lt;debug/debug.h&gt;
#  include &lt;bits/unique_ptr.h&gt;
#  include &lt;bits/shared_ptr.h&gt;
#  include &lt;bits/shared_ptr_atomic.h&gt;
#  if _GLIBCXX_USE_DEPRECATED
#    include &lt;backward/auto_ptr.h&gt;
#  endif
#else
#  include &lt;backward/auto_ptr.h&gt;
#endif

#if __cplusplus &gt;= 201103L
#  include &lt;cstdint&gt;
#  ifdef _GLIBCXX_USE_C99_STDINT_TR1
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

/**
 *  @brief Fit aligned storage in buffer.
 *
 *  [ptr.align]
 *
 *  This function tries to fit @a __size bytes of storage with alignment
 *  @a __align into the buffer @a __ptr of size @a __space bytes.  If such
 *  a buffer fits then @a __ptr is changed to point to the first byte of the
 *  aligned storage and @a __space is reduced by the bytes used for alignment.
 *
 *  @param __align   A fundamental or extended alignment value.
 *  @param __size    Size of the aligned storage required.
 *  @param __ptr     Pointer to a buffer of @a __space bytes.
 *  @param __space   Size of the buffer pointed to by @a __ptr.
 *  @return the updated pointer if the aligned storage fits, otherwise nullptr.
 */
inline void*
align(size_t __align, size_t __size, void*&amp; __ptr, size_t&amp; __space) noexcept
{
  const auto __intptr = reinterpret_cast&lt;uintptr_t&gt;(__ptr);
  const auto __aligned = (__intptr - 1u + __align) &amp; -__align;
  const auto __diff = __aligned - __intptr;
  if ((__size + __diff) &gt; __space)
    return nullptr;
  else
    {
      __space -= __diff;
      return __ptr = reinterpret_cast&lt;void*&gt;(__aligned);
    }
}

// 20.7.4 [util.dynamic.safety], pointer safety

enum class pointer_safety { relaxed, preferred, strict };

inline void
declare_reachable(void*) { }

template &lt;typename _Tp&gt;
  inline _Tp*
  undeclare_reachable(_Tp* __p) { return __p; }

inline void
declare_no_pointers(char*, size_t) { }

inline void
undeclare_no_pointers(char*, size_t) { }

inline pointer_safety
get_pointer_safety() noexcept { return pointer_safety::relaxed; }

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
#endif // _GLIBCXX_USE_C99_STDINT_TR1
#endif // C++11

#endif /* _GLIBCXX_MEMORY */
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