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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2013-2014 Attila Molnar <attilamolnar@hush.com>
*
* 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>
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>
struct 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>;
};
template <typename T, typename Tag>
class intrusive_list
{
public:
class iterator : public std::iterator<std::bidirectional_iterator_tag, T*>
{
T* curr;
public:
iterator(T* i = NULL)
: curr(i)
{
}
iterator& operator++()
{
curr = curr->intrusive_list_node<T, Tag>::ptr_next;
return *this;
}
iterator operator++(int)
{
iterator ret(*this);
operator++();
return ret;
}
void operator--()
{
curr = curr->intrusive_list_node<T, Tag>::ptr_prev;
return *this;
}
iterator operator--(int)
{
iterator ret(*this);
operator--();
return ret;
}
bool operator==(const iterator& other) const { return (curr == other.curr); }
bool operator!=(const iterator& other) const { return (curr != other.curr); }
T* operator*() const { return curr; }
};
typedef iterator const_iterator;
intrusive_list()
: listhead(NULL)
, listsize(0)
{
}
bool empty() const
{
return (size() == 0);
}
size_t size() const
{
return listsize;
}
iterator begin() const
{
return iterator(listhead);
}
iterator end() const
{
return iterator();
}
void pop_front()
{
erase(listhead);
}
T* front() const
{
return listhead;
}
void push_front(T* x)
{
if (listsize++)
{
x->intrusive_list_node<T, Tag>::ptr_next = listhead;
listhead->intrusive_list_node<T, Tag>::ptr_prev = x;
}
listhead = x;
}
void erase(const iterator& it)
{
erase(*it);
}
void erase(T* x)
{
if (listhead == x)
listhead = x->intrusive_list_node<T, Tag>::ptr_next;
x->intrusive_list_node<T, Tag>::unlink();
listsize--;
}
private:
T* listhead;
size_t listsize;
};
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