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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 IvlChainItem;
class IvlChainIter;
class IvlChain {
friend class IvlChainIter;
public:
enum chain_status { NoError, WasEmpty, TooEarly, TooFar, BadIterator };
protected:
IvlChainItem* LastLink;
chain_status StatusFlag;
inline IvlChain () : LastLink (0), StatusFlag (NoError) { }
inline IvlChain (IvlChainItem* e) : LastLink (e), StatusFlag (NoError) { }
virtual ~IvlChain ();
virtual IvlChainItem* GetNext (IvlChainItem*) const = 0;
virtual void SetNext (IvlChainItem*, IvlChainItem*) const = 0;
virtual void Delete (IvlChainItem*) const = 0;
IvlChainItem* GetPrevious (IvlChainItem*) ;
public:
inline chain_status GetStatus () const { return StatusFlag; }
inline int IsEmpty () const { return !LastLink; }
IvlChainItem* First ();
IvlChainItem* Last ();
IvlChainItem* Nth (int n);
int Length () const;
int Find (IvlChainItem*) const;
void Append (IvlChainItem*);
void Prepend (IvlChainItem*);
inline IvlChain& operator << (IvlChainItem* it) { Append (it); return *this; }
IvlChainItem* RemoveFirst ();
IvlChainItem* RemoveLast ();
int Remove (IvlChainItem*);
int Remove (int (*) (IvlChainItem*));
void Clear ();
void InsertAfter (const IvlChainIter&, IvlChainItem*);
void InsertBefore (const IvlChainIter&, IvlChainItem*);
IvlChainItem* RemoveAfter (const IvlChainIter&);
void InsertAfter (IvlChainItem*, IvlChainItem*);
void InsertBefore (IvlChainItem*, IvlChainItem*);
IvlChainItem* RemoveAfter (IvlChainItem*);
};
class IvlChainIter {
friend class IvlChain;
public:
enum chainiter_status { Normal, StartOfChain, EndOfChain };
private:
const IvlChain* TheChain;
IvlChainItem* CurLink;
chainiter_status StatusFlag;
public:
inline IvlChainIter (const IvlChain& l) : TheChain (&l), CurLink (0), StatusFlag (StartOfChain) { }
inline void Reset () { CurLink = 0; StatusFlag = StartOfChain; }
IvlChainIter& operator ++ ();
IvlChainItem* operator * () const;
int Find (IvlChainItem*);
inline chainiter_status GetStatus () const { return StatusFlag; }
inline operator int () const { return StatusFlag == Normal; }
};
#ifndef CPLUS_BUG19
template <class ITEM> class IvlChainOf : public IvlChain {
protected:
IvlChainItem* GetNext (IvlChainItem* i) const { return ((ITEM*) i)->GetNext (); }
void SetNext (IvlChainItem* i, IvlChainItem* j) const { ((ITEM*) i)->SetNext ((ITEM*) j); }
void Delete (IvlChainItem* i) const { delete (ITEM*) i; }
public:
inline IvlChainOf () : IvlChain () { }
inline IvlChainOf (ITEM* e) : IvlChain (e) { }
inline ~IvlChainOf () {}
};
template <class ITEM> class IvlChainIterOf : public IvlChainIter {
public:
inline IvlChainIterOf (const IvlChainOf <ITEM>& l) : IvlChainIter (l) { }
inline ITEM* operator * () const { return (ITEM*) IvlChainIter::operator * (); }
};
#endif /* CPLUS_BUG19 */
#endif /* Chain_H_ */
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