mirror of git://gcc.gnu.org/git/gcc.git
135 lines
4.2 KiB
C++
135 lines
4.2 KiB
C++
// <memory> -*- C++ -*-
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// Copyright (C) 2001-2015 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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*/
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#ifndef _GLIBCXX_MEMORY
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#define _GLIBCXX_MEMORY 1
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#pragma GCC system_header
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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/stl_algobase.h>
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#include <bits/allocator.h>
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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_tempbuf.h>
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#include <bits/stl_raw_storage_iter.h>
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#if __cplusplus >= 201103L
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# include <exception> // std::exception
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# include <typeinfo> // std::type_info in get_deleter
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# include <iosfwd> // std::basic_ostream
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# include <ext/atomicity.h>
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# include <ext/concurrence.h>
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# include <bits/functexcept.h>
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# include <bits/stl_function.h> // std::less
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# include <bits/uses_allocator.h>
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# include <type_traits>
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# include <functional>
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# include <debug/debug.h>
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# include <bits/unique_ptr.h>
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# include <bits/shared_ptr.h>
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# include <bits/shared_ptr_atomic.h>
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# if _GLIBCXX_USE_DEPRECATED
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# include <backward/auto_ptr.h>
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# endif
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#else
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# include <backward/auto_ptr.h>
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#endif
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#if __cplusplus >= 201103L
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# include <cstdint>
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# ifdef _GLIBCXX_USE_C99_STDINT_TR1
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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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/**
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* @brief Fit aligned storage in buffer.
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*
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* [ptr.align]
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*
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* This function tries to fit @a __size bytes of storage with alignment
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* @a __align into the buffer @a __ptr of size @a __space bytes. If such
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* a buffer fits then @a __ptr is changed to point to the first byte of the
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* aligned storage and @a __space is reduced by the bytes used for alignment.
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*
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* @param __align A fundamental or extended alignment value.
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* @param __size Size of the aligned storage required.
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* @param __ptr Pointer to a buffer of @a __space bytes.
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* @param __space Size of the buffer pointed to by @a __ptr.
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* @return the updated pointer if the aligned storage fits, otherwise nullptr.
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*/
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inline void*
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align(size_t __align, size_t __size, void*& __ptr, size_t& __space) noexcept
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{
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const auto __intptr = reinterpret_cast<uintptr_t>(__ptr);
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const auto __aligned = (__intptr - 1u + __align) & -__align;
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const auto __diff = __aligned - __intptr;
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if ((__size + __diff) > __space)
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return nullptr;
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else
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{
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__space -= __diff;
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return __ptr = reinterpret_cast<void*>(__aligned);
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}
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}
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#endif // _GLIBCXX_USE_C99_STDINT_TR1
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#endif // C++11
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#endif /* _GLIBCXX_MEMORY */
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