mlIntrusivePtrBase.h

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/*************************************************************************************
**
** Copyright 2010, MeVis Medical Solutions AG
**
** The user may use this file in accordance with the license agreement provided with
** the Software or, alternatively, in accordance with the terms contained in a
** written agreement between the user and MeVis Medical Solutions AG.
**
** For further information use the contact form at https://www.mevislab.de/contact
**
**************************************************************************************/
 
#ifndef ML_INTRUSIVE_PTR_BASE_H
#define ML_INTRUSIVE_PTR_BASE_H
 
 
 
#include "mlVesselGraphSystem.h"
#include "VesselGraphTypes.h"
#include "VesselGraphDisableWarnings.h"
#include <boost/thread/mutex.hpp>
#include "VesselGraphRestoreWarnings.h"
 
#ifdef WIN32
#pragma warning( push )
#pragma warning( disable : 4396 )
#endif
 
VESSELGRAPH_BEGIN_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); }
 
VESSELGRAPH_END_NAMESPACE
 
#ifdef WIN32
#pragma warning( pop )
#endif
 
#endif // __mlIntrusivePtrBase_H_