rewritten

amxmodx/CList.h

@@ -36,83 +36,270 @@
 // class CList
 // *****************************************************
 // Linked list
-
 template <typename T, typename F = char* >
-class CList {
-public:
-	class iterator;
-	class CListEle {
-		friend class CList<T,F>;
-		friend class iterator;
-		T* obj;
-		CListEle* next;
-		CListEle( T* a , CListEle* nn ) : obj(a) , next(nn) {}
-	public:
-		T& operator* () { return *obj; }
-	};
-private:
-	CListEle *head;
-public:
-	CList<T,F>() { head = 0; }
-	~CList<T,F>() {	clear(); }
-	void clear() {
-		iterator a = begin();
-		while( a ) a.remove();
-	}
-	bool empty() const{
-		return (head ? false : true);
-	}
-	void put( T* a ) {	
-		head = new CListEle( a , head ); 
-	}
-	int size() const{
-		CListEle *p = head;
-		int i = 0;
-		while (p)
+class CList
+{
+private:
+	// One list element
+	class CElement
+	{
+		T *m_pObject;						// pointer to the object
+		CElement *m_pNext;					// pointer to the next element
+		CElement *m_pPrev;					// pointer to the previous element
+	public:
+		// dereference operator
+		T& operator* ()
+		{
+			return *m_pObject;
+		}
+
+		// constructor
+		CElement(T *pObj)
+		{
+			m_pObject = pObj;
+			m_pNext = NULL;
+			m_pPrev = NULL;
+		}
+
+		// destructor
+		~CElement()
+		{
+			delete m_pObject;
+			if (m_pNext)
+				m_pNext->m_pPrev = m_pPrev;
+			if (m_pPrev)
+				m_pPrev->m_pNext = m_pNext;
+		}
+
+		// returns object pointer
+		T *GetObj()
+		{
+			return m_pObject;
+		}
+
+		// returns next element pointer
+		CElement *GetNext()
+		{
+			return m_pNext;
+		}
+
+		// sets next element
+		void SetNext(CElement *newNext)
+		{
+			m_pNext = newNext;
+		}
+
+		// returns previous element pointer
+		CElement *GetPrev()
+		{
+			return m_pPrev;
+		}
+
+		// sets previous element
+		void SetPrev(CElement *newPrev)
+		{
+			m_pPrev = newPrev;
+		}
+	};
+
+	// CList<T,F> class
+	CElement *m_pHead;					// head of the linked list
+	CElement *m_pTail;					// tail of the linked list
+public:
+	// iterator class
+	class iterator
+	{
+		friend class CList<T,F>;
+		CList<T,F> *m_pList;			// The list that created this iterator
+		CElement *m_CurPos;				// Current position in the list
+	public:
+		iterator()
+		{
+			m_pList = NULL;
+			m_CurPos = NULL;
+		}
+
+		// constructor based on list, element
+		iterator(CList<T,F> *pList, CElement *startPos)
+		{
+			m_pList = pList;
+			m_CurPos = startPos;
+		}
+
+		// constructor based on other iterator
+		iterator(iterator &other)
+		{
+			m_pList = other.m_pList;
+			m_CurPos = other.m_CurPos;
+		}
+
+		// dereference operator
+		T & operator* () const
+		{
+			return *m_CurPos->GetObj();
+		}
+
+		T * operator-> () const
+		{
+			return m_CurPos->GetObj();
+		}
+
+		// validity check operator
+		inline operator bool () const
+		{
+			return m_pList!=NULL && m_CurPos!=NULL && m_CurPos->GetObj()!=NULL;
+		}
+
+		// pre increment operator
+		inline iterator& operator ++ ()
+		{
+			m_CurPos = m_CurPos->GetNext();
+			return *this;
+		}
+
+		// post increment operator
+		inline iterator operator++(int)
+		{
+			iterator tmp(*this);
+			m_CurPos = m_CurPos)->next;
+			return tmp;
+		}
+
+		// returns iterator that points to next element
+		iterator GetNext()
+		{
+			iterator tmp(*this);
+			return ++tmp;
+		}
+
+		iterator remove()
+		{
+			return m_pList->remove(*this);
+		}
+		iterator put(T *obj)
+		{
+			return m_pList->put(obj, *this);
+		}
+	};
+
+	CList<T,F>()
+	{
+		m_pHead = NULL;
+		m_pTail = NULL;
+	}
+	~CList<T,F>()
+	{
+		clear();
+	}
+
+	// removes the object referenced by where
+	// sets where to the next object
+	// returns an iterator pointing to the next object
+	iterator remove(iterator &where)
+	{
+		iterator tmp(where.GetNext());
+		if (where.m_CurPos == m_pHead)
+			m_pHead = where.m_CurPos->GetNext();
+		if (where.m_CurPos == m_pTail)
+			m_pTail = where.m_CurPos->GetPrev();
+		delete where.m_CurPos;
+		where = tmp;
+		return tmp;
+	}
+
+	// puts an element to the end of the list
+	// returns an iterator pointing to it
+	iterator put_back(T *pObj)
+	{
+		CElement *pTmp = new CElement(pObj);
+		if (!m_pHead)
+		{
+			m_pHead = pTmp;
+			m_pTail = pTmp;
+		}
+		else
+		{
+			pTmp->SetNext(NULL);
+			pTmp->SetPrev(m_pTail);
+			m_pTail->SetNext(pTmp);
+			m_pTail = pTmp;
+		}
+		return iterator(this, pTmp);
+	}
+
+	iterator put_front(T *pObj)
+	{
+		CElement *pTmp = new CElement(pObj);
+		if (!m_pHead)
+		{
+			m_pHead = pTmp;
+			m_pTail = pTmp;
+		}
+		else
+		{
+			pTmp->SetNext(m_pHead);
+			pTmp->SetPrev(NULL);
+			m_pHead->SetPrev(pTmp);
+			m_pHead = pTmp;
+		}
+		return iterator(this, pTmp);
+	}
+
+	// alias for put_back
+	iterator put(T *pObj)
+	{
+		return put_back(pObj);
+	}
+
+	// puts an element after where
+	// sets where to point to the new element
+	// returns an iterator pointing to the new element
+	iterator put(T *pObj, iterator where)
+	{
+		CElement *pTmp = new CElement(pObj);
+		if (where.m_pNext)
+			where.m_pNext->m_pPrev = pTmp;
+		else		// where = tail
+			m_pTail = pObj;
+		where.m_pNext = pTmp;
+		pTmp->SetPrev(where.m_CurPos);
+		pTmp->SetNext(where.m_pNext->m_CurPos);
+		return ++where;
+	}
+
+	iterator begin()
+	{
+		return iterator(this, m_pHead);
+	}
+
+	void clear()
+	{
+		iterator iter = begin();
+		while (iter) iter.remove();
+	}
+	iterator find(F desc)
+	{
+		iterator iter = begin();
+		while(iter)
+		{
+			if (*iter == desc)
+				break;
+			++iter;
+		}
+		return iter;
+	}
+
+	int size()
+	{
+		iterator iter = begin();
+		int i=0;
+		while (iter)
 		{
-			p = p->next;
 			++i;
+			++iter;
 		}
 		return i;
 	}
-	class iterator {
-		CListEle** a;
-	public:
-		iterator(CListEle** i=0) : a(i){}
-		T& operator*() const {	return *(*a)->obj;}
-		inline operator bool () const { return (a && *a); }
-		inline iterator& operator++() {
-			a = &(*a)->next;
-			return *this;
-		}
-		inline iterator operator++(int) {
-			iterator tmp(a);
-			a = &(*a)->next;
-			return tmp;
-		}
-		iterator& remove(){
-			CListEle* aa = (*a)->next;
-			delete (*a)->obj;
-			delete *a;
-			*a = aa;
-			return *this;	
-		}
-		iterator& put( T* aa ){
-			*a = new CListEle( aa , *a );
-			return *this;
-		}
 };
-	inline iterator begin() { return iterator(&head); }
-	iterator find( F a ){
-		iterator cc = begin();
-		while(cc){
-			if ( *cc == a )
-				break;
-			++cc;
-		}
-		return cc;
-	}
-};
-
 #endif