intrusive_list.h

/*
 * InspIRCd -- Internet Relay Chat Daemon
 *
 *   Copyright (C) 2014 Attila Molnar <[email protected]>
 *
 * This file is part of InspIRCd.  InspIRCd 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, version 2.
 *
 * This program 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 
#pragma once
 
#include <iterator>
 
namespace insp
{
 
struct intrusive_list_def_tag { };
 
template <typename T, typename Tag = intrusive_list_def_tag> class intrusive_list;
template <typename T, typename Tag = intrusive_list_def_tag> class intrusive_list_tail;
 
template <typename T, typename Tag = intrusive_list_def_tag>
class intrusive_list_node
{
        T* ptr_next;
        T* ptr_prev;
 
        void unlink()
        {
                if (ptr_next)
                        ptr_next->intrusive_list_node<T, Tag>::ptr_prev = this->ptr_prev;
                if (ptr_prev)
                        ptr_prev->intrusive_list_node<T, Tag>::ptr_next = this->ptr_next;
                ptr_next = ptr_prev = NULL;
        }
 
 public:
        intrusive_list_node()
                : ptr_next(NULL)
                , ptr_prev(NULL)
        {
        }
 
        friend class intrusive_list<T, Tag>;
        friend class intrusive_list_tail<T, Tag>;
};
 
} // namespace insp
 
// Intrusive list where the list only has a pointer to the head element
#define INSPIRCD_INTRUSIVE_LIST_NAME intrusive_list
#include "intrusive_list_impl.h"
#undef INSPIRCD_INTRUSIVE_LIST_NAME
 
// Intrusive list where the list maintains a pointer to both the head and the tail elements.
// Additional methods: back(), push_back(), pop_back()
#define INSPIRCD_INTRUSIVE_LIST_NAME intrusive_list_tail
#define INSPIRCD_INTRUSIVE_LIST_HAS_TAIL
#include "intrusive_list_impl.h"
#undef INSPIRCD_INTRUSIVE_LIST_NAME
#undef INSPIRCD_INTRUSIVE_LIST_HAS_TAIL