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-rw-r--r--lib/asio/detail/object_pool.hpp171
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diff --git a/lib/asio/detail/object_pool.hpp b/lib/asio/detail/object_pool.hpp
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-//
-// detail/object_pool.hpp
-// ~~~~~~~~~~~~~~~~~~~~~~
-//
-// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
-//
-// Distributed under the Boost Software License, Version 1.0. (See accompanying
-// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-//
-
-#ifndef ASIO_DETAIL_OBJECT_POOL_HPP
-#define ASIO_DETAIL_OBJECT_POOL_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/noncopyable.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-namespace detail {
-
-template <typename Object>
-class object_pool;
-
-class object_pool_access
-{
-public:
- template <typename Object>
- static Object* create()
- {
- return new Object;
- }
-
- template <typename Object, typename Arg>
- static Object* create(Arg arg)
- {
- return new Object(arg);
- }
-
- template <typename Object>
- static void destroy(Object* o)
- {
- delete o;
- }
-
- template <typename Object>
- static Object*& next(Object* o)
- {
- return o->next_;
- }
-
- template <typename Object>
- static Object*& prev(Object* o)
- {
- return o->prev_;
- }
-};
-
-template <typename Object>
-class object_pool
- : private noncopyable
-{
-public:
- // Constructor.
- object_pool()
- : live_list_(0),
- free_list_(0)
- {
- }
-
- // Destructor destroys all objects.
- ~object_pool()
- {
- destroy_list(live_list_);
- destroy_list(free_list_);
- }
-
- // Get the object at the start of the live list.
- Object* first()
- {
- return live_list_;
- }
-
- // Allocate a new object.
- Object* alloc()
- {
- Object* o = free_list_;
- if (o)
- free_list_ = object_pool_access::next(free_list_);
- else
- o = object_pool_access::create<Object>();
-
- object_pool_access::next(o) = live_list_;
- object_pool_access::prev(o) = 0;
- if (live_list_)
- object_pool_access::prev(live_list_) = o;
- live_list_ = o;
-
- return o;
- }
-
- // Allocate a new object with an argument.
- template <typename Arg>
- Object* alloc(Arg arg)
- {
- Object* o = free_list_;
- if (o)
- free_list_ = object_pool_access::next(free_list_);
- else
- o = object_pool_access::create<Object>(arg);
-
- object_pool_access::next(o) = live_list_;
- object_pool_access::prev(o) = 0;
- if (live_list_)
- object_pool_access::prev(live_list_) = o;
- live_list_ = o;
-
- return o;
- }
-
- // Free an object. Moves it to the free list. No destructors are run.
- void free(Object* o)
- {
- if (live_list_ == o)
- live_list_ = object_pool_access::next(o);
-
- if (object_pool_access::prev(o))
- {
- object_pool_access::next(object_pool_access::prev(o))
- = object_pool_access::next(o);
- }
-
- if (object_pool_access::next(o))
- {
- object_pool_access::prev(object_pool_access::next(o))
- = object_pool_access::prev(o);
- }
-
- object_pool_access::next(o) = free_list_;
- object_pool_access::prev(o) = 0;
- free_list_ = o;
- }
-
-private:
- // Helper function to destroy all elements in a list.
- void destroy_list(Object* list)
- {
- while (list)
- {
- Object* o = list;
- list = object_pool_access::next(o);
- object_pool_access::destroy(o);
- }
- }
-
- // The list of live objects.
- Object* live_list_;
-
- // The free list.
- Object* free_list_;
-};
-
-} // namespace detail
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#endif // ASIO_DETAIL_OBJECT_POOL_HPP