| // <memory> -*- C++ -*- |
| |
| // Copyright (C) 2001-2015 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 |
| // <http://www.gnu.org/licenses/>. |
| |
| /* |
| * 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 "as is" 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 <bits/stl_algobase.h> |
| #include <bits/allocator.h> |
| #include <bits/stl_construct.h> |
| #include <bits/stl_uninitialized.h> |
| #include <bits/stl_tempbuf.h> |
| #include <bits/stl_raw_storage_iter.h> |
| |
| #if __cplusplus >= 201103L |
| # include <exception> // std::exception |
| # include <typeinfo> // std::type_info in get_deleter |
| # include <iosfwd> // std::basic_ostream |
| # include <ext/atomicity.h> |
| # include <ext/concurrence.h> |
| # include <bits/functexcept.h> |
| # include <bits/stl_function.h> // std::less |
| # include <bits/uses_allocator.h> |
| # include <type_traits> |
| # include <functional> |
| # include <debug/debug.h> |
| # include <bits/unique_ptr.h> |
| # include <bits/shared_ptr.h> |
| # include <bits/shared_ptr_atomic.h> |
| # if _GLIBCXX_USE_DEPRECATED |
| # include <backward/auto_ptr.h> |
| # endif |
| #else |
| # include <backward/auto_ptr.h> |
| #endif |
| |
| #if __cplusplus >= 201103L |
| # include <cstdint> |
| # 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*& __ptr, size_t& __space) noexcept |
| { |
| const auto __intptr = reinterpret_cast<uintptr_t>(__ptr); |
| const auto __aligned = (__intptr - 1u + __align) & -__align; |
| const auto __diff = __aligned - __intptr; |
| if ((__size + __diff) > __space) |
| return nullptr; |
| else |
| { |
| __space -= __diff; |
| return __ptr = reinterpret_cast<void*>(__aligned); |
| } |
| } |
| |
| _GLIBCXX_END_NAMESPACE_VERSION |
| } // namespace |
| #endif // _GLIBCXX_USE_C99_STDINT_TR1 |
| #endif // C++11 |
| |
| #endif /* _GLIBCXX_MEMORY */ |