198 lines
3.5 KiB
C++
198 lines
3.5 KiB
C++
//-----------------------------------------------------------------------------+
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// Copyright (C), 1998-2007, Beijing Tangent Software Co. Ltd.
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// = FileName : TPGeGDList.h
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// = Version : ver2.0
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// = Author : xlc
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// = CreateDate : 2002-09-09
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// = Description: 类的声明 双向递归链
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// = Maintainers:
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//
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//-----------------------------------------------------------------------------+
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#ifndef _TPGEGDLIST_H_
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#define _TPGEGDLIST_H_
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#ifndef _TPGEGLIST_H_
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#include "TPGeGList.h"
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#endif
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template<class T> class TPGeGDList : public TPGeGList<T>
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{
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public:
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TPGeGDList();
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//pList!=NULL!!!
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virtual void CNNext(TPGeGDList*pList);
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virtual void DCNNext();
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//释放所有前面结点，本结点成为起始结点
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void ReleaseAllPre();
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TPGeGDList<T>*Next() const;
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TPGeGDList<T>*Pre() const;
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TPGeGDList<T>* GetTail() const;
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//如果是环路GetTail与GetHead结果相同
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TPGeGDList<T>* GetHead() const;
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TPGeGDList<T>* GetAt(long i) const;
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const T& GetData(long i) const;
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void DCNPre();
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void SetPre(TPGeGDList<T>* pList) const;
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//安全转接,自动断开所有原相关链接,pList!=NULL!!!
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void CNPre(TPGeGDList*pList);
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TPGeGDList<T>* FetchNext(long num = 1);
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//返回新链首,如果本结点非链首，将在本结点处形成分叉!如果是环路将保持环路
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TPGeGDList<T>* Reverse();
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protected:
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TPGeGDList* pre;
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};
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template<class T>
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TPGeGDList<T>::TPGeGDList() : pre(NULL)
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{
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}
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template<class T>
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TPGeGDList<T>* TPGeGDList<T>::Next() const
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{
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return (TPGeGDList<T>*)this->next;
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}
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template<class T>
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TPGeGDList<T>* TPGeGDList<T>::Pre() const
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{
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return pre;
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}
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template<class T>
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TPGeGDList<T>* TPGeGDList<T>::GetTail() const
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{
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return (TPGeGDList<T>*)(TPGeGList<T>::GetTail());
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}
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template<class T>
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const T& TPGeGDList<T>::GetData(long i) const
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{
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return GetAt(i)->GetData();
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}
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template<class T>
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void TPGeGDList<T>::SetPre(TPGeGDList<T>* pList) const
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{//一般不使用!
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pre = pList;
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}
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template<class T>
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void TPGeGDList<T>::DCNNext()
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{
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if (this->next != NULL)
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{
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this->next->SetPre(NULL);
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this->next = NULL;
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}
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}
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template<class T>
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void TPGeGDList<T>::DCNPre()
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{
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if(pre != NULL)
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{
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pre->SetNext(NULL);
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pre = NULL;
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}
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}
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template<class T>
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TPGeGDList<T>* TPGeGDList<T>::FetchNext(long num/* = 1*/)
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{
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return (TPGeGDList<T>*)(TPGeGList<T>::FetchNext(num));
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}
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template<class T>
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void TPGeGDList<T>::CNNext(TPGeGDList*pList)
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{
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DCNNext();
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pList->DCNPre();
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this->SetNext(pList);
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pList->SetPre(this);
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}
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template<class T>
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void TPGeGDList<T>::CNPre(TPGeGDList*pList)
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{
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DCNPre();
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pList->DCNNext();
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SetPre(pList);
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pList->SetNext(this);
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}
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template<class T>
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TPGeGDList<T>* TPGeGDList<T>::GetHead() const
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{
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for(const TPGeGDList<T>*pCur = this; pCur->Pre() != NULL && pCur->Pre() != this; pCur = pCur->Pre());
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return (TPGeGDList<T>*)this->pCur;
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}
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template<class T>
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TPGeGDList<T>* TPGeGDList<T>::GetAt(long i) const
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{
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if(i >= 0)
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{
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return (TPGeGDList<T>*)(TPGeGList<T>::GetAt(i));
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}
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else
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{
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long count = 1;
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for(TPGeGDList<T>*pCur = Pre(); count< -i && pCur != NULL; count++, pCur = pCur->Pre());
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return this->pCur;
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}
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}
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template<class T>
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void TPGeGDList<T>::ReleaseAllPre()
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{
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TPGeGDList<T>* pHead = GetHead();
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DCNPre();
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delete pHead;
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}
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template<class T>
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TPGeGDList<T>* TPGeGDList<T>::Reverse()
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{
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TPGeGDList<T> *pPre = this,*pCur = Next();
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while(pCur != NULL && pCur != this)
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{
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TPGeGDList<T>* temp = pCur->Next();
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pCur->SetNext(pPre);
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pPre->SetPre(pCur);
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pPre = pCur;
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pCur = temp;
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}
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if(pCur == NULL)
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{
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this->SetNext(NULL);
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pPre->SetPre(NULL);
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return pPre;
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}
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else
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{
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this->SetNext(pPre);
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pPre->SetPre(this);
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return this;
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}
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}
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#endif |