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IotrRefCount.h

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/* OOQP                                                               *
 * Authors: E. Michael Gertz, Stephen J. Wright                       *
 * (C) 2001 University of Chicago. See Copyright Notification in OOQP */

#ifndef IOTRREFCOUNT
#define IOTRREFCOUNT

#include <assert.h>

class IotrRefCount {
public:
  static int instances;

  int refs() { return mRefs; };

  static inline void release( IotrRefCount ** obj );

  static inline void addRef( IotrRefCount * const * obj );

  IotrRefCount() : mRefs(1) { instances++; };
protected:
  virtual ~IotrRefCount() { instances--; };
private:
  int mRefs;
  IotrRefCount& operator=( const IotrRefCount & )
  {
    // mRefs = mRefs;
    return *this;
  }
  IotrRefCount( const IotrRefCount& )
  {
        instances++;
        mRefs = 1;
  }
};

inline void IotrRefCount::release(IotrRefCount ** obj )
{
  assert( !*obj || (*obj)->mRefs > 0 );
  if( *obj && 0 >= --(*obj)->mRefs ) delete *obj;
  *obj = 0;
}

inline void IotrRefCount::addRef( IotrRefCount * const * obj )
{
  assert( !*obj || (*obj)->mRefs > 0 );
  if( *obj ) (*obj)->mRefs++;
}

template <class T>
inline void IotrRelease( T ** obj )
{
  IotrRefCount * objref = *obj;
  IotrRefCount::release( &objref );

  *obj = (T*) objref;
}

template <class T>
inline void IotrAddRef( T * const *  obj )
{
  IotrRefCount * objref = *obj;
  IotrRefCount::addRef( &objref );
}

#endif

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