168 lines
5.0 KiB
C++
168 lines
5.0 KiB
C++
//
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// detail/memory.hpp
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// ~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_DETAIL_MEMORY_HPP
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#define ASIO_DETAIL_MEMORY_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#include <cstddef>
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#include <cstdlib>
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#include <memory>
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#include <new>
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#include "asio/detail/cstdint.hpp"
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#include "asio/detail/throw_exception.hpp"
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#if !defined(ASIO_HAS_STD_SHARED_PTR)
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# include <boost/make_shared.hpp>
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# include <boost/shared_ptr.hpp>
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# include <boost/weak_ptr.hpp>
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#endif // !defined(ASIO_HAS_STD_SHARED_PTR)
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#if !defined(ASIO_HAS_STD_ADDRESSOF)
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# include <boost/utility/addressof.hpp>
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#endif // !defined(ASIO_HAS_STD_ADDRESSOF)
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#if !defined(ASIO_HAS_STD_ALIGNED_ALLOC) \
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&& defined(ASIO_HAS_BOOST_ALIGN) \
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&& defined(ASIO_HAS_ALIGNOF)
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# include <boost/align/aligned_alloc.hpp>
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#endif // !defined(ASIO_HAS_STD_ALIGNED_ALLOC)
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// && defined(ASIO_HAS_BOOST_ALIGN)
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// && defined(ASIO_HAS_ALIGNOF)
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namespace asio {
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namespace detail {
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#if defined(ASIO_HAS_STD_SHARED_PTR)
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using std::make_shared;
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using std::shared_ptr;
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using std::weak_ptr;
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#else // defined(ASIO_HAS_STD_SHARED_PTR)
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using boost::make_shared;
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using boost::shared_ptr;
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using boost::weak_ptr;
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#endif // defined(ASIO_HAS_STD_SHARED_PTR)
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#if defined(ASIO_HAS_STD_ADDRESSOF)
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using std::addressof;
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#else // defined(ASIO_HAS_STD_ADDRESSOF)
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using boost::addressof;
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#endif // defined(ASIO_HAS_STD_ADDRESSOF)
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#if defined(ASIO_HAS_STD_TO_ADDRESS)
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using std::to_address;
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#else // defined(ASIO_HAS_STD_TO_ADDRESS)
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template <typename T>
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inline T* to_address(T* p) { return p; }
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template <typename T>
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inline const T* to_address(const T* p) { return p; }
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template <typename T>
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inline volatile T* to_address(volatile T* p) { return p; }
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template <typename T>
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inline const volatile T* to_address(const volatile T* p) { return p; }
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#endif // defined(ASIO_HAS_STD_TO_ADDRESS)
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inline void* align(std::size_t alignment,
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std::size_t size, void*& ptr, std::size_t& space)
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{
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#if defined(ASIO_HAS_STD_ALIGN)
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return std::align(alignment, size, ptr, space);
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#else // defined(ASIO_HAS_STD_ALIGN)
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const uintptr_t intptr = reinterpret_cast<uintptr_t>(ptr);
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const uintptr_t aligned = (intptr - 1u + alignment) & -alignment;
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const std::size_t padding = aligned - intptr;
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if (size + padding > space)
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return 0;
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space -= padding;
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ptr = reinterpret_cast<void*>(aligned);
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return ptr;
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#endif // defined(ASIO_HAS_STD_ALIGN)
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}
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} // namespace detail
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#if defined(ASIO_HAS_CXX11_ALLOCATORS)
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using std::allocator_arg_t;
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# define ASIO_USES_ALLOCATOR(t) \
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namespace std { \
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template <typename Allocator> \
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struct uses_allocator<t, Allocator> : true_type {}; \
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} \
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/**/
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# define ASIO_REBIND_ALLOC(alloc, t) \
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typename std::allocator_traits<alloc>::template rebind_alloc<t>
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/**/
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#else // defined(ASIO_HAS_CXX11_ALLOCATORS)
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struct allocator_arg_t {};
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# define ASIO_USES_ALLOCATOR(t)
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# define ASIO_REBIND_ALLOC(alloc, t) \
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typename alloc::template rebind<t>::other
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/**/
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#endif // defined(ASIO_HAS_CXX11_ALLOCATORS)
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inline void* aligned_new(std::size_t align, std::size_t size)
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{
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#if defined(ASIO_HAS_STD_ALIGNED_ALLOC) && defined(ASIO_HAS_ALIGNOF)
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align = (align < ASIO_DEFAULT_ALIGN) ? ASIO_DEFAULT_ALIGN : align;
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size = (size % align == 0) ? size : size + (align - size % align);
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void* ptr = std::aligned_alloc(align, size);
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if (!ptr)
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{
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std::bad_alloc ex;
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asio::detail::throw_exception(ex);
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}
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return ptr;
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#elif defined(ASIO_HAS_BOOST_ALIGN) && defined(ASIO_HAS_ALIGNOF)
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align = (align < ASIO_DEFAULT_ALIGN) ? ASIO_DEFAULT_ALIGN : align;
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size = (size % align == 0) ? size : size + (align - size % align);
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void* ptr = boost::alignment::aligned_alloc(align, size);
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if (!ptr)
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{
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std::bad_alloc ex;
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asio::detail::throw_exception(ex);
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}
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return ptr;
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#elif defined(ASIO_MSVC) && defined(ASIO_HAS_ALIGNOF)
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align = (align < ASIO_DEFAULT_ALIGN) ? ASIO_DEFAULT_ALIGN : align;
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size = (size % align == 0) ? size : size + (align - size % align);
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void* ptr = _aligned_malloc(size, align);
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if (!ptr)
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{
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std::bad_alloc ex;
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asio::detail::throw_exception(ex);
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}
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return ptr;
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#else // defined(ASIO_MSVC) && defined(ASIO_HAS_ALIGNOF)
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(void)align;
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return ::operator new(size);
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#endif // defined(ASIO_MSVC) && defined(ASIO_HAS_ALIGNOF)
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}
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inline void aligned_delete(void* ptr)
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{
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#if defined(ASIO_HAS_STD_ALIGNED_ALLOC) && defined(ASIO_HAS_ALIGNOF)
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std::free(ptr);
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#elif defined(ASIO_HAS_BOOST_ALIGN) && defined(ASIO_HAS_ALIGNOF)
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boost::alignment::aligned_free(ptr);
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#elif defined(ASIO_MSVC) && defined(ASIO_HAS_ALIGNOF)
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_aligned_free(ptr);
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#else // defined(ASIO_MSVC) && defined(ASIO_HAS_ALIGNOF)
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::operator delete(ptr);
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#endif // defined(ASIO_MSVC) && defined(ASIO_HAS_ALIGNOF)
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}
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} // namespace asio
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#endif // ASIO_DETAIL_MEMORY_HPP
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