105 lines
2.3 KiB
C++
105 lines
2.3 KiB
C++
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//
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// detail/recycling_allocator.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2021 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_RECYCLING_ALLOCATOR_HPP
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#define ASIO_DETAIL_RECYCLING_ALLOCATOR_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 "asio/detail/memory.hpp"
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#include "asio/detail/thread_context.hpp"
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#include "asio/detail/thread_info_base.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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template <typename T, typename Purpose = thread_info_base::default_tag>
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class recycling_allocator
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{
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public:
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typedef T value_type;
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template <typename U>
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struct rebind
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{
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typedef recycling_allocator<U, Purpose> other;
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};
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recycling_allocator()
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{
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}
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template <typename U>
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recycling_allocator(const recycling_allocator<U, Purpose>&)
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{
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}
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T* allocate(std::size_t n)
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{
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void* p = thread_info_base::allocate(Purpose(),
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thread_context::top_of_thread_call_stack(), sizeof(T) * n);
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return static_cast<T*>(p);
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}
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void deallocate(T* p, std::size_t n)
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{
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thread_info_base::deallocate(Purpose(),
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thread_context::top_of_thread_call_stack(), p, sizeof(T) * n);
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}
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};
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template <typename Purpose>
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class recycling_allocator<void, Purpose>
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{
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public:
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typedef void value_type;
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template <typename U>
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struct rebind
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{
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typedef recycling_allocator<U, Purpose> other;
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};
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recycling_allocator()
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{
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}
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template <typename U>
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recycling_allocator(const recycling_allocator<U, Purpose>&)
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{
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}
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};
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template <typename Allocator, typename Purpose>
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struct get_recycling_allocator
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{
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typedef Allocator type;
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static type get(const Allocator& a) { return a; }
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};
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template <typename T, typename Purpose>
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struct get_recycling_allocator<std::allocator<T>, Purpose>
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{
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typedef recycling_allocator<T, Purpose> type;
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static type get(const std::allocator<T>&) { return type(); }
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};
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // ASIO_DETAIL_RECYCLING_ALLOCATOR_HPP
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