EsenthalEngine/ThirdPartyLibs/Bullet/lib/Extras/HACD/hacdCircularList.inl

#pragma once
#ifndef HACD_CIRCULAR_LIST_INL
#define HACD_CIRCULAR_LIST_INL
#include<stdlib.h>
#include "hacdVersion.h"
namespace HACD
{
	template < typename T > 
	inline bool CircularList<T>::Delete(CircularListElement<T> * element)
	{
        if (!element)
        {
            return false;
        }
		if (m_size > 1)
		{
			CircularListElement<T> * next = element->GetNext();
			CircularListElement<T> * prev = element->GetPrev();
			delete element;
			m_size--;
            if (element == m_head)
            {
                m_head = next;
            }
			next->GetPrev() = prev;
			prev->GetNext() = next;
			return true;
		}
		else if (m_size == 1)
		{
			delete m_head;
			m_size--;
			m_head = 0;
			return true;
		}
		else
		{
			return false;
		}
	}
    
	template < typename T > 
	inline bool CircularList<T>::Delete()
	{
		if (m_size > 1)
		{
			CircularListElement<T> * next = m_head->GetNext();
			CircularListElement<T> * prev = m_head->GetPrev();
			delete m_head;
			m_size--;
			m_head = next;
			next->GetPrev() = prev;
			prev->GetNext() = next;
			return true;
		}
		else if (m_size == 1)
		{
			delete m_head;
			m_size--;
			m_head = 0;
			return true;
		}
		else
		{
			return false;
		}
	}
	template < typename T > 
	inline CircularListElement<T> * CircularList<T>::Add(const T * data)
	{
		if (m_size == 0)
		{
			if (data)
			{
				m_head = new CircularListElement<T>(*data);
			}
			else
			{
				m_head = new CircularListElement<T>();
			}
			m_head->GetNext() = m_head->GetPrev() = m_head;
		}
		else
		{
			CircularListElement<T> * next = m_head->GetNext();
			CircularListElement<T> * element = m_head;
			if (data)
			{
				m_head = new CircularListElement<T>(*data);
			}
			else
			{
				m_head = new CircularListElement<T>;
			}
			m_head->GetNext() = next;
			m_head->GetPrev() = element;
			element->GetNext() = m_head;
			next->GetPrev() = m_head;
		}
		m_size++;
		return m_head;
	}
	template < typename T > 
	inline CircularListElement<T> * CircularList<T>::Add(const T & data)
	{
		const T * pData = &data;
		return Add(pData);
	}
	template < typename T > 
	inline bool CircularList<T>::Next()
	{
		if (m_size == 0)
		{
			return false;
		}
		m_head = m_head->GetNext();
		return true;
	}
	template < typename T > 
	inline bool CircularList<T>::Prev()
	{
		if (m_size == 0)
		{
			return false;
		}
		m_head = m_head->GetPrev();
		return true;
	}
	template < typename T > 
	inline CircularList<T>::CircularList(const CircularList& rhs)
	{
		if (rhs.m_size > 0)
		{
			CircularListElement<T> * current = rhs.m_head;
			do
			{
				current = current->GetNext();
				Add(current->GetData());
			}
			while ( current != rhs.m_head );
		}
	}
    template < typename T > 
	inline const CircularList<T>& CircularList<T>::operator=(const CircularList& rhs)
	{
        if (&rhs != this)
        {
            Clear();
            if (rhs.m_size > 0)
            {
                CircularListElement<T> * current = rhs.m_head;
                do
                {
                    current = current->GetNext();
                    Add(current->GetData());
                }
                while ( current != rhs.m_head );
            }
        }
        return (*this);
	}
}
#endif