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#ifndef __REF_H__
#define __REF_H__
//////////////////////////////////////////////////////////////////////////////
// class Referenc
// Desc: Base class enabling reference interface
// Note: Class should derive as virtual
//
class Referenc
{
public:
Referenc()
: refs_count(0) {};
inline int AddRef()
{
return ++refs_count;
}
inline int RemRef()
{
return --refs_count;
}
inline int RefCount()
{
return refs_count;
}
private:
int refs_count;
};
//////////////////////////////////////////////////////////////////////////////
// template Ref
// Desc: Holder in smart-pointers system.
// Important: Only Referenc subclasses may be used as template param.
//
template <class T>
class Ref
{
public:
// Constructors & destructor
Ref();
//Ref(Ref<T> &ref);
Ref(const Ref<T> &ref);
Ref(T *ptr);
Ref(const T *ptr);
~Ref();
Ref<T> &operator =(Ref<T> &ref);
Ref<T> &operator =(T *ptr);
inline T *Addr();
inline T *Addr() const;
inline int RefCount();
inline bool IsNull();
inline T *operator ->();
inline operator const T *() const;
inline operator T *();
//private:
void RemRef();
private:
T *m_ptr;
};
//////////////////////////////////////////////////////////////////////////////
// Constructors & destructor
template <class T> Ref<T>::Ref()
: m_ptr(NULL)
{
}
//template <class T> Ref<T>::Ref(Ref<T> &ref)
//: m_ptr(NULL)
//{
// if (ref.Addr() != NULL)
// {
// m_ptr = ref.Addr();
// ((Referenc *)m_ptr)->AddRef();
// }
//}
template <class T> Ref<T>::Ref(const Ref<T> &ref)
: m_ptr(NULL)
{
if (ref.Addr() != NULL)
{
m_ptr = ref.Addr();
((Referenc *)m_ptr)->AddRef();
}
}
template <class T> Ref<T>::Ref(T *ptr)
: m_ptr(NULL)
{
if (ptr != NULL)
{
m_ptr = ptr;
((Referenc *)m_ptr)->AddRef();
}
}
template <class T> Ref<T>::Ref(const T *ptr)
: m_ptr(NULL)
{
if (ptr != NULL)
{
m_ptr = ptr;
((Referenc *)m_ptr)->AddRef();
}
}
template <class T> Ref<T>::~Ref()
{
if (m_ptr == NULL)
return;
RemRef();
}
// Check pointer on correctness
template <class T> bool Ref<T>::IsNull()
{
return (m_ptr == NULL);
}
//////////////////////////////////////////////////////////////////////////////
// Operators
template <class T> Ref<T> &Ref<T>::operator =(T *ptr)
{
if (ptr != NULL)
{
if (m_ptr != ptr)
{
RemRef();
m_ptr = ptr;
((Referenc *)m_ptr)->AddRef();
}
}
else if (m_ptr != NULL)
RemRef();
return *this;
}
template <class T> Ref<T> &Ref<T>::operator =(Ref<T> &ref)
{
if (ref.Addr() != NULL)
{
if (m_ptr != ref.Addr())
{
RemRef();
m_ptr = ref.Addr();
((Referenc *)m_ptr)->AddRef();
}
}
else if (m_ptr != NULL)
RemRef();
return *this;
}
// Get pointer
template <class T> T *Ref<T>::Addr()
{
return m_ptr;
}
template <class T> T *Ref<T>::Addr() const
{
return m_ptr;
}
// Get refs count
template <class T> int Ref<T>::RefCount()
{
if (m_ptr == NULL)
return 0;
return ((Referenc *)m_ptr)->RefCount();
}
// Remove ref to the object and delete it if necessary
// WARNING: arrays cannot be deleted
template <class T> void Ref<T>::RemRef()
{
if (m_ptr == NULL)
return;
if (((Referenc *)m_ptr)->RemRef() == 0)
delete m_ptr;
m_ptr = NULL;
}
template <class T> T *Ref<T>::operator ->()
{
return m_ptr;
}
template <class T> Ref<T>::operator const T *() const
{
return m_ptr;
}
template <class T> Ref<T>::operator T *()
{
return m_ptr;
}
#endif // __REF_H__
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