mlRefCountedBase.h

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/*************************************************************************************
**
** Copyright 2011, 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_REF_COUNTED_BASE_H
#define ML_REF_COUNTED_BASE_H

 
#include "mlEventSource.h"
 
#include <ThirdPartyWarningsDisable.h>
#include <boost/intrusive_ptr.hpp>
#include <ThirdPartyWarningsRestore.h>
#include <atomic>
 
ML_START_NAMESPACE
 
//----------------------------------------------------------------------
class ML_UTILS_EXPORT RefCountedBase : public EventSource
{
public:
  RefCountedBase();

  RefCountedBase(const RefCountedBase&);

  virtual void incRefCount() const;

  virtual void decRefCount() const;

  bool isRefCountedBase() const override { return true; }

  static void updateReferenceCountingIfSupported(Base* oldValue, Base* newValue, bool& isRefCountedBase);

  ML_ABSTRACT_CLASS_HEADER(RefCountedBase)
 
protected:
  ~RefCountedBase() override;

  mutable std::atomic_int_least32_t _refCount;
};
 
inline void intrusive_ptr_add_ref(const ML_UTILS_NAMESPACE::RefCountedBase* p)
{
  p->incRefCount();
}
 
inline void intrusive_ptr_release(const ML_UTILS_NAMESPACE::RefCountedBase* p)
{
  p->decRefCount();
}
 
ML_UTILS_END_NAMESPACE

#define ML_REFCOUNTED_PTR(CLASSNAME) \
  class CLASSNAME; \
  typedef ::boost::intrusive_ptr<CLASSNAME> CLASSNAME##Ptr; \
  typedef ::boost::intrusive_ptr<const CLASSNAME> CLASSNAME##ConstPtr;
 
ML_START_NAMESPACE
  ML_REFCOUNTED_PTR(RefCountedBase)
ML_END_NAMESPACE
 
#endif // __mlRefCountedBase_H