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/*
* CENA C++ Utilities
*
* by Stephane Chatty
*
* Copyright 1992
* Centre d'Etudes de la Navigation Aerienne (CENA)
*
* generic chains of objects - to be updated
*
* $Id$
* $CurLog$
*/
#ifndef Chain_H_
#define Chain_H_
#include "cplus_bugs.h"
typedef void CcuChainItem;
class CcuChainIter;
class CcuChain {
friend class CcuChainIter;
public:
enum chain_status { NoError, WasEmpty, TooEarly, TooFar, BadIterator };
protected:
CcuChainItem* LastLink;
chain_status StatusFlag;
inline CcuChain () : LastLink (0), StatusFlag (NoError) { }
inline CcuChain (CcuChainItem* e) : LastLink (e), StatusFlag (NoError) { }
virtual ~CcuChain ();
virtual CcuChainItem* GetNext (CcuChainItem*) const = 0;
virtual void SetNext (CcuChainItem*, CcuChainItem*) const = 0;
virtual void Delete (CcuChainItem*) const = 0;
CcuChainItem* GetPrevious (CcuChainItem*) ;
public:
inline chain_status GetStatus () const { return StatusFlag; }
inline int IsEmpty () const { return !LastLink; }
CcuChainItem* First ();
CcuChainItem* Last ();
CcuChainItem* Nth (int n);
int Length () const;
int Find (CcuChainItem*) const;
void Append (CcuChainItem*);
void Prepend (CcuChainItem*);
inline CcuChain& operator << (CcuChainItem* it) { Append (it); return *this; }
CcuChainItem* RemoveFirst ();
CcuChainItem* RemoveLast ();
int Remove (CcuChainItem*);
int Remove (int (*) (CcuChainItem*));
void Clear ();
void InsertAfter (const CcuChainIter&, CcuChainItem*);
void InsertBefore (const CcuChainIter&, CcuChainItem*);
CcuChainItem* RemoveAfter (const CcuChainIter&);
void InsertAfter (CcuChainItem*, CcuChainItem*);
void InsertBefore (CcuChainItem*, CcuChainItem*);
CcuChainItem* RemoveAfter (CcuChainItem*);
};
class CcuChainIter {
friend class CcuChain;
public:
enum chainiter_status { Normal, StartOfChain, EndOfChain };
private:
const CcuChain* TheChain;
CcuChainItem* CurLink;
chainiter_status StatusFlag;
public:
inline CcuChainIter (const CcuChain& l) : TheChain (&l), CurLink (0), StatusFlag (StartOfChain) { }
inline void Reset () { CurLink = 0; StatusFlag = StartOfChain; }
CcuChainIter& operator ++ ();
CcuChainItem* operator * () const;
int Find (CcuChainItem*);
inline chainiter_status GetStatus () const { return StatusFlag; }
inline operator int () const { return StatusFlag == Normal; }
};
#ifndef CPLUS_BUG19
template <class ITEM> class CcuChainOf : public CcuChain {
protected:
CcuChainItem* GetNext (CcuChainItem* i) const { return ((ITEM*) i)->GetNext (); }
void SetNext (CcuChainItem* i, CcuChainItem* j) const { ((ITEM*) i)->SetNext ((ITEM*) j); }
void Delete (CcuChainItem* i) const { delete (ITEM*) i; }
public:
inline CcuChainOf () : CcuChain () { }
inline CcuChainOf (ITEM* e) : CcuChain (e) { }
inline ~CcuChainOf () {}
};
template <class ITEM> class CcuChainIterOf : public CcuChainIter {
public:
inline CcuChainIterOf (const CcuChainOf <ITEM>& l) : CcuChainIter (l) { }
inline ITEM* operator * () const { return (ITEM*) CcuChainIter::operator * (); }
};
#endif /* CPLUS_BUG19 */
#endif /* Chain_H_ */
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