103 lines
1.8 KiB
C++
103 lines
1.8 KiB
C++
|
|
#ifndef REFPTR_H
|
|
#define REFPTR_H REFPTR_H
|
|
|
|
#include <stdlib.h> /* NULL */
|
|
|
|
template <typename T>
|
|
class refptr
|
|
{
|
|
public:
|
|
refptr<T>();
|
|
refptr<T>(T * ptr);
|
|
refptr<T>(const refptr<T> & orig);
|
|
refptr<T> & operator=(const refptr<T> & orig);
|
|
refptr<T> & operator=(T * ptr);
|
|
~refptr<T>();
|
|
T & operator*() const;
|
|
T * operator->() const;
|
|
|
|
private:
|
|
void cloneFrom(const refptr<T> & orig);
|
|
void destroy();
|
|
|
|
T * m_ptr;
|
|
int * m_refCount;
|
|
};
|
|
|
|
template <typename T> refptr<T>::refptr()
|
|
{
|
|
m_ptr = NULL;
|
|
m_refCount = NULL;
|
|
}
|
|
|
|
template <typename T> refptr<T>::refptr(T * ptr)
|
|
{
|
|
m_ptr = ptr;
|
|
m_refCount = new int;
|
|
*m_refCount = 1;
|
|
}
|
|
|
|
template <typename T> refptr<T>::refptr(const refptr<T> & orig)
|
|
{
|
|
cloneFrom(orig);
|
|
}
|
|
|
|
template <typename T> refptr<T> & refptr<T>::operator=(const refptr<T> & orig)
|
|
{
|
|
destroy();
|
|
cloneFrom(orig);
|
|
return *this;
|
|
}
|
|
|
|
template <typename T> refptr<T> & refptr<T>::operator=(T * ptr)
|
|
{
|
|
destroy();
|
|
m_ptr = ptr;
|
|
m_refCount = new int;
|
|
*m_refCount = 1;
|
|
return *this;
|
|
}
|
|
|
|
template <typename T> void refptr<T>::cloneFrom(const refptr<T> & orig)
|
|
{
|
|
this->m_ptr = orig.m_ptr;
|
|
this->m_refCount = orig.m_refCount;
|
|
if (m_refCount != NULL)
|
|
(*m_refCount)++;
|
|
}
|
|
|
|
template <typename T> refptr<T>::~refptr()
|
|
{
|
|
destroy();
|
|
}
|
|
|
|
template <typename T> void refptr<T>::destroy()
|
|
{
|
|
if (m_refCount != NULL)
|
|
{
|
|
if (*m_refCount <= 1)
|
|
{
|
|
delete m_ptr;
|
|
delete m_refCount;
|
|
}
|
|
else
|
|
{
|
|
(*m_refCount)--;
|
|
}
|
|
}
|
|
}
|
|
|
|
template <typename T> T & refptr<T>::operator*() const
|
|
{
|
|
return *m_ptr;
|
|
}
|
|
|
|
template <typename T> T * refptr<T>::operator->() const
|
|
{
|
|
return m_ptr;
|
|
}
|
|
|
|
#endif
|
|
|