MnReferenceCounter.h

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// @(#)root/minuit2:$Id$
// Authors: M. Winkler, F. James, L. Moneta, A. Zsenei   2003-2005
 
/**********************************************************************
 *                                                                    *
 * Copyright (c) 2005 LCG ROOT Math team,  CERN/PH-SFT                *
 *                                                                    *
 **********************************************************************/
 
#ifndef ROOT_Minuit2_MnReferenceCounter
#define ROOT_Minuit2_MnReferenceCounter
 
#include <cassert>
 
#include "StackAllocator.h"
 
namespace ROOT {
 
namespace Minuit2 {
 
// extern StackAllocator gStackAllocator;
 
class MnReferenceCounter {
 
public:
   MnReferenceCounter() : fReferences(0) {}
 
   MnReferenceCounter(const MnReferenceCounter &other) : fReferences(other.fReferences) {}
 
   MnReferenceCounter &operator=(const MnReferenceCounter &other)
   {
      fReferences = other.fReferences;
      return *this;
   }
 
   ~MnReferenceCounter() { assert(fReferences == 0); }
 
   void *operator new(size_t nbytes) { return StackAllocatorHolder::Get().Allocate(nbytes); }
 
   void operator delete(void *p, size_t /*nbytes */) { StackAllocatorHolder::Get().Deallocate(p); }
 
   unsigned int References() const { return fReferences; }
 
   void AddReference() const { fReferences++; }
 
   void RemoveReference() const { fReferences--; }
 
private:
   mutable unsigned int fReferences;
};
 
} // namespace Minuit2
 
} // namespace ROOT
 
#endif // ROOT_Minuit2_MnReferenceCounter