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  1. // <memory> -*- C++ -*-
  2.  
  3. // Copyright (C) 2001-2015 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.  */
  42.  
  43. #ifndef _GLIBCXX_MEMORY
  44. #define _GLIBCXX_MEMORY 1
  45.  
  46. #pragma GCC system_header
  47.  
  48. /**
  49.  * @defgroup memory Memory
  50.  * @ingroup utilities
  51.  *
  52.  * Components for memory allocation, deallocation, and management.
  53.  */
  54.  
  55. /**
  56.  * @defgroup pointer_abstractions Pointer Abstractions
  57.  * @ingroup memory
  58.  *
  59.  * Smart pointers, etc.
  60.  */
  61.  
  62. #include <bits/stl_algobase.h>
  63. #include <bits/allocator.h>
  64. #include <bits/stl_construct.h>
  65. #include <bits/stl_uninitialized.h>
  66. #include <bits/stl_tempbuf.h>
  67. #include <bits/stl_raw_storage_iter.h>
  68.  
  69. #if __cplusplus >= 201103L
  70. #  include <exception>            // std::exception
  71. #  include <typeinfo>             // std::type_info in get_deleter
  72. #  include <iosfwd>               // std::basic_ostream
  73. #  include <ext/atomicity.h>
  74. #  include <ext/concurrence.h>
  75. #  include <bits/functexcept.h>
  76. #  include <bits/stl_function.h>  // std::less
  77. #  include <bits/uses_allocator.h>
  78. #  include <type_traits>
  79. #  include <functional>
  80. #  include <debug/debug.h>
  81. #  include <bits/unique_ptr.h>
  82. #  include <bits/shared_ptr.h>
  83. #  include <bits/shared_ptr_atomic.h>
  84. #  if _GLIBCXX_USE_DEPRECATED
  85. #    include <backward/auto_ptr.h>
  86. #  endif
  87. #else
  88. #  include <backward/auto_ptr.h>
  89. #endif
  90.  
  91. #if __cplusplus >= 201103L
  92. #  include <cstdint>
  93. #  ifdef _GLIBCXX_USE_C99_STDINT_TR1
  94. namespace std _GLIBCXX_VISIBILITY(default)
  95. {
  96. _GLIBCXX_BEGIN_NAMESPACE_VERSION
  97.  
  98. /**
  99.  *  @brief Fit aligned storage in buffer.
  100.  *
  101.  *  [ptr.align]
  102.  *
  103.  *  This function tries to fit @a __size bytes of storage with alignment
  104.  *  @a __align into the buffer @a __ptr of size @a __space bytes.  If such
  105.  *  a buffer fits then @a __ptr is changed to point to the first byte of the
  106.  *  aligned storage and @a __space is reduced by the bytes used for alignment.
  107.  *
  108.  *  @param __align   A fundamental or extended alignment value.
  109.  *  @param __size    Size of the aligned storage required.
  110.  *  @param __ptr     Pointer to a buffer of @a __space bytes.
  111.  *  @param __space   Size of the buffer pointed to by @a __ptr.
  112.  *  @return the updated pointer if the aligned storage fits, otherwise nullptr.
  113.  */
  114. inline void*
  115. align(size_t __align, size_t __size, void*& __ptr, size_t& __space) noexcept
  116. {
  117.   const auto __intptr = reinterpret_cast<uintptr_t>(__ptr);
  118.   const auto __aligned = (__intptr - 1u + __align) & -__align;
  119.   const auto __diff = __aligned - __intptr;
  120.   if ((__size + __diff) > __space)
  121.     return nullptr;
  122.   else
  123.     {
  124.       __space -= __diff;
  125.       return __ptr = reinterpret_cast<void*>(__aligned);
  126.     }
  127. }
  128.  
  129. _GLIBCXX_END_NAMESPACE_VERSION
  130. } // namespace
  131. #endif // _GLIBCXX_USE_C99_STDINT_TR1
  132. #endif // C++11
  133.  
  134. #endif /* _GLIBCXX_MEMORY */
  135.