SoRef.h

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**=======================================================================*/
/*=======================================================================
** Author      : VSG (MMM YYYY)
**=======================================================================*/
 
#ifndef SO_REF_H
#define SO_REF_H
 
#include <Inventor/misc/SoAutoRef.h>
 
template <typename T>
class SoRef : public SoAutoRef
{
public:
  SoRef()
  {};
 
  SoRef(const SoRef<T>& that)
  :SoAutoRef(that)
  {
  }
 
  SoRef(T* pIn)
  :SoAutoRef(dynamic_cast<T*>(pIn))
  {
  }
 
  template<typename Y>
  SoRef(const SoRef<Y>& that)
  {
    m_pointer = that.ptr();
    if (m_pointer)
      m_pointer->ref();
  }
 
  inline T* releaseNoDelete()
  {
    T* p = dynamic_cast<T*>(m_pointer);
    if (m_pointer)
    {
      m_pointer->unrefNoDelete();
      m_pointer = NULL;
    }
    return p;
  }
 
 
  SoRef<T>& operator=(const SoRef<T>& that)
  {
    (*this) = (T*)(that.m_pointer);
    return *this;
  }
 
  template<typename Y>
  SoRef<T>& operator=(const SoRef<Y>& that)
  {
    (*this) = dynamic_cast<T*>(that.ptr());
    return *this;
  }
 
  SoRef<T>& operator=(T* ptr)
  {
    if (m_pointer != ptr) {
      if (m_pointer)
        m_pointer->unref();
      m_pointer = ptr;
      if (m_pointer)
        m_pointer->ref();
    }
    return *this;
  }
 
  T& operator*() const
  { return *((T*)m_pointer); }
 
  T* operator->() const
  { return ((T*)(m_pointer)); }
 
  T* ptr() const 
  { return ((T*)(m_pointer)); }
 
};
 
#endif // SO_REF_H