EQ2EMu/EQ2/source/common/queue.h

/*  
    EQ2Emulator:  Everquest II Server Emulator
    Copyright (C) 2007  EQ2EMulator Development Team (http://www.eq2emulator.net)

    This file is part of EQ2Emulator.

    EQ2Emulator 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, either version 3 of the License, or
    (at your option) any later version.

    EQ2Emulator 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 EQ2Emulator.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef QUEUE_H
#define QUEUE_H

template<class T>
class MyQueue;

template<class T>
class MyQueueNode
{
public:
    MyQueueNode(T* data)
    {
        next = 0;
        this->data = data;
    }

    friend class MyQueue<T>;

private:
    T* data;
    MyQueueNode<T>* next;
};

template<class T>
class MyQueue
{
public:
    MyQueue()
    {
        head = tail = 0;
    }
	~MyQueue() {
		clear();
	}

    void push(T* data)
    {
        if (head == 0)
        {
            tail = head = new MyQueueNode<T>(data);
        }
        else
        {
            tail->next = new MyQueueNode<T>(data);
            tail = tail->next;
        }
    }

    T* pop()
    {
        if (head == 0)
        {
            return 0;
        }

        T* data = head->data;
        MyQueueNode<T>* next_node = head->next;
        delete head;
        head = next_node;

        return data;
    }

    T* top()
    {
        if (head == 0)
        {
            return 0;
        }

        return head->data;
    }

    bool empty()
    {
        if (head == 0)
        {
            return true;
        }

        return false;
    }

    void clear()
    {
		T* d = 0;
        while((d = pop())) {
			delete d;
		}
        return;
    }

    int count()
    {
    	int count = 0;
		MyQueueNode<T>* d = head;
        while(d != 0) {
        	count++;
        	d = d->next;
		}
        return(count);
    }

private:
    MyQueueNode<T>* head;
    MyQueueNode<T>* tail;
};

#endif