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/*
* CENA C++ Utilities
*
* by Stephane Chatty
*
* Copyright 1990, 1991, 1992
* Laboratoire de Recherche en Informatique (LRI)
* Centre d'Etudes de la Navigation Aerienne (CENA)
*
* smart pointers, originally by Michel Beaudouin-Lafon
*
* $Id$
* $CurLog$
*/
#ifndef SmartPointer_H_
#define SmartPointer_H_
#ifdef __GNUG__
#pragma interface
#endif
#include "cplus_bugs.h"
class CcuSmartData {
public:
enum check_type { doNoCheck, doOnlyDynamic, doWarn, doAbort };
private:
static check_type check;
int State;
inline int IsDynamic () const { return !(State & 1); }
protected:
static int NextCreatedIsDynamic;
public:
void* operator new (unsigned long);
inline void operator delete (void* that) { ::delete (that); }
CcuSmartData ();
CcuSmartData (const CcuSmartData&);
virtual ~CcuSmartData ();
static check_type SetCheck (check_type);
void DecrRef ();
inline void IncrRef () { State += 2; }
};
#ifndef CPLUS_BUG19
template <class DATA> class CcuSmartPointerTo {
protected:
DATA* Data;
inline void DecrDataRef () const { if (Data) Data->DecrRef (); }
inline void IncrDataRef () const { if (Data) Data->IncrRef (); }
public:
inline CcuSmartPointerTo () : Data (0) { }
inline CcuSmartPointerTo (DATA* d) : Data (d) { IncrDataRef (); }
inline CcuSmartPointerTo (const CcuSmartPointerTo<DATA>& p) : Data (p.Data) { IncrDataRef (); }
inline ~CcuSmartPointerTo () { DecrDataRef (); Data = 0; }
inline CcuSmartPointerTo<DATA>& operator = (DATA* d) { if (d != Data) { DecrDataRef (); Data = d; IncrDataRef (); } return *this;}
inline int operator == (const DATA* d) const { return Data == d;}
inline int operator != (const DATA* d) const { return Data != d;}
inline int operator == (const CcuSmartPointerTo<DATA>& p) const { return Data == p.Data;}
inline int operator != (const CcuSmartPointerTo<DATA>& p) const { return Data != p.Data;}
inline DATA* operator -> () const { return Data; }
inline DATA& operator * () const { return *Data; }
inline operator DATA* () const { return Data; }
};
#define PointerClass(SmartClass, DataClass) typedef CcuSmartPointerTo <DataClass> SmartClass;
#else /* CPLUS_BUG19 */
#define PointerClass(SmartClass, DataClass) \
class SmartClass { \
protected: \
DataClass* Data; \
inline void DecrDataRef () const { if (Data) Data->DecrRef (); } \
inline void IncrDataRef () const { if (Data) Data->IncrRef (); } \
\
public: \
inline SmartClass () : Data (0) { } \
inline SmartClass (DataClass* d) : Data (d) { IncrDataRef (); } \
inline SmartClass (const SmartClass& p) : Data (p.Data) { IncrDataRef (); } \
inline ~SmartClass () { DecrDataRef (); Data = 0; } \
inline SmartClass& operator = (DataClass* d) { if (d != Data) { DecrDataRef (); Data = d; IncrDataRef (); } return *this;} \
inline int operator == (const DataClass* d) const { return Data == d;} \
inline int operator != (const DataClass* d) const { return Data != d;} \
inline int operator == (const SmartClass& p) const { return Data == p.Data;} \
inline int operator != (const SmartClass& p) const { return Data != p.Data;} \
inline DataClass* operator -> () const { return Data; } \
inline DataClass& operator * () const { return *Data; } \
inline operator DataClass* () const { return Data; } \
};
#endif /* CPLUS_BUG19 */
#define DerivedPointerClass(SmartClass, BaseSmartClass, DataClass) \
class SmartClass : public BaseSmartClass { \
public: \
inline SmartClass () : BaseSmartClass () { } \
inline SmartClass (const SmartClass& p) : BaseSmartClass (p) { } \
inline SmartClass (DataClass* d) : BaseSmartClass (d) { } \
inline SmartClass& operator = (DataClass* d) { if (d != Data) { DecrDataRef (); Data = d; IncrDataRef (); } return *this; } \
inline DataClass* operator -> () const { return (DataClass*) Data; } \
inline DataClass& operator * () const { return * ((DataClass*) Data); } \
inline operator DataClass* () const { return (DataClass*) Data; } \
};
#ifdef DOC
global macro PointerClass (SmartClass, DataClass);
global macro DerivedPointerClass (SmartClass, BaseSmartClass, DataClass);
#endif
#endif /* SmartPointer_H_ */
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