MeVisLab/Standard/Sources/ML/MLVesselGraph/Properties/mlIntrusivePtrBase.h

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// **InsertLicense** code
//----------------------------------------------------------------------------------

//----------------------------------------------------------------------------------

#ifndef __mlIntrusivePtrBase_H_
#define __mlIntrusivePtrBase_H_

#include "mlVesselGraphSystem.h"
#include <mlTypeDefs.h>
#include "mlSystemWarningsDisable.h"
#include <boost/thread/mutex.hpp>
#include "mlSystemWarningsRestore.h"

#ifdef WIN32
#pragma warning( push )
#pragma warning( disable : 4396 )
#endif

ML_START_NAMESPACE

// Some forward declarations, which are required to be able to declare the required friend functions for boost::intrusive_ptr.

// Forward declaration of our templated (see below) base class.
template<typename Derived>
class IntrusivePtrBase;

// Forward declaration of the functions used by boost::intrusive_ptr
template<typename Derived>
void intrusive_ptr_add_ref(const IntrusivePtrBase<Derived>* ptr);
template<typename Derived>
void intrusive_ptr_release(const IntrusivePtrBase<Derived>* ptr);

template<typename Derived>
class IntrusivePtrBase {
protected:
  IntrusivePtrBase(): _referenceCount(0) {};

private:
  friend void intrusive_ptr_add_ref<>(const IntrusivePtrBase<Derived>* ptr);
  friend void intrusive_ptr_release<>(const IntrusivePtrBase<Derived>* ptr);

  mutable long _referenceCount;
  mutable boost::mutex _referenceCountMutex;
};

template<typename Derived>
inline void intrusive_ptr_add_ref(const IntrusivePtrBase<Derived>* ptr) { ptr->_referenceCountMutex.lock(); ptr->_referenceCount++; ptr->_referenceCountMutex.unlock(); }
template<typename Derived>
inline void intrusive_ptr_release(const IntrusivePtrBase<Derived>* ptr) { ptr->_referenceCountMutex.lock(); ptr->_referenceCount--; ptr->_referenceCountMutex.unlock(); if (ptr->_referenceCount==0) delete static_cast<const Derived*>(ptr); }

ML_END_NAMESPACE

#ifdef WIN32
#pragma warning( pop )
#endif

#endif // __mlIntrusivePtrBase_H_