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145 lines (126 loc) · 2.25 KB
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/* -*- C++ -*- */
#ifndef _REFCOUNTER_CPP_
#define _REFCOUNTER_CPP_
#include "Refcounter.h"
/// default Ctor
template <typename T>
Refcounter<T>::Refcounter (void)
: ptr_ (0)
{
}
/// Ctor with refcounting functionality
template <typename T>
Refcounter<T>::Refcounter (T *ptr, bool increase_count)
: ptr_ (new Shim (ptr))
{
if (increase_count)
increment ();
}
/// copy Ctor
template <typename T>
Refcounter<T>::Refcounter (const Refcounter &rhs)
: ptr_ (rhs.ptr_)
{
increment ();
}
/// Dtor will delete pointer if refcount becomes 0
template <typename T>
Refcounter<T>::~Refcounter (void)
{
decrement ();
}
/// assignment operator for times when you don't want the reference
/// increased for incoming ptr.
template <typename T>
void
Refcounter<T>::operator= (T *ptr)
{
decrement ();
ptr_ = new Shim (ptr);
}
/// assignment operator
template <typename T>
void
Refcounter<T>::operator= (const Refcounter& rhs)
{
decrement ();
ptr_ = rhs.ptr_;
increment ();
}
/// get the underlying pointer
template <typename T>
T *
Refcounter<T>::get_ptr (void)
{
return ptr_->t_;
}
/// get the underlying pointer
template <typename T>
const T *
Refcounter<T>::get_ptr (void) const
{
return ptr_->t_;
}
/// dereference operator
template <typename T>
T &
Refcounter<T>::operator* (void)
{
return *ptr_->t_;
}
/// dereference operator
template <typename T>
const
T &
Refcounter<T>::operator* (void) const
{
return *ptr_->t_;
}
/// mimic pointer dereferencing
template <typename T>
T *
Refcounter<T>::operator-> (void)
{
return ptr_->t_;
}
/// mimic pointer dereferencing
template <typename T>
const T *
Refcounter<T>::operator-> (void) const
{
return ptr_->t_;
}
/// implementation of the increment operation
template <typename T>
void
Refcounter<T>::increment (void)
{
if (ptr_)
++ptr_->refcount_;
}
/// implementation of the decrement operation
template <typename T>
void
Refcounter<T>::decrement (void)
{
if (ptr_)
{
--ptr_->refcount_;
if (ptr_->refcount_ <= 0)
{
delete ptr_;
ptr_ = 0;
}
}
}
template <typename T>
Refcounter<T>::Shim::Shim (T *t)
: t_ (t), refcount_ (1)
{
}
template <typename T>
Refcounter<T>::Shim::~Shim (void)
{
delete t_;
}
#endif /* _REFCOUNTER_CPP_ */