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