小生我折翼了。。

小生我折翼了。。

不说了，直接贴代码。。

#ifndef PASS_REF_PTR
#define PASS_REF_PTR
#include "SharedPtr.h"

namespace moora_utils
{
template <class _Ty>
 class SharedPtr;

template <class _Ty>
 class PassRefPtr
 {
  _Ty* ptr_;
  
 public:
  //use it carefully
  _Ty* get(){return ptr_;}
  
  explicit PassRefPtr(_Ty* ptr):ptr_(ptr)
  {
  }
  
  template <class _Tu>
  PassRefPtr(const PassRefPtr<_Tu>& other):ptr_(other.get())
  {
  }
  
  template <class _Tu>
  PassRefPtr(SharedPtr<_Tu>& other);
  
  template <class _Tu>
  PassRefPtr& operator=(PassRefPtr<_Tu>& other)
  {
   this->ptr_ = other.ptr_;
   return *this;
  }
  
  _Ty* operator->()
  {
   return ptr_;
  }
  
  template <class _Tu>
  PassRefPtr& operator=(SharedPtr<_Tu>& other);
  
  
 };
 
template <class _Ty>  template <class _Tu> inline
 PassRefPtr<_Ty>::PassRefPtr(SharedPtr<_Tu>& other):ptr_(other.get()){}

template <class _Ty>  template <class _Tu> inline
 PassRefPtr<_Ty>& PassRefPtr<_Ty>::operator=(SharedPtr<_Tu>& other)
{
 ptr_ = other.get();
}
}
#endif

#ifndef SHARED_PTR
#define SHARED_PTR
#include "PassRefPtr.h"
namespace moora_utils {

template <class _Ty>
 class PassRefPtr;

template <class _Ty>
 class SharedPtr
 {
  _Ty* ptr_;
  
 public:
  //use it carefully
  _Ty* get()
  {
   return ptr_;
  }
  
  explicit SharedPtr(_Ty* ptr):ptr_(ptr)
  {
   ptr_->ref();
  }
  
  template <class _Tu>
  SharedPtr(const SharedPtr<_Tu>& other):ptr_(other.get())
  {
   ptr_->ref();
  }
  
  template <class _Tu>
  SharedPtr(PassRefPtr<_Tu>& other);
  
  template <class _Tu>
  SharedPtr& operator=(SharedPtr<_Tu>& other)
  {
   ptr_->deref();
   ptr_ = other.get();
   ptr_->ref();
   return *this;
  }
  
  template <class _Tu>
  SharedPtr& operator=(PassRefPtr<_Tu>& other);
  
  _Ty* operator->()
  {
   return ptr_;
  }
  
  ~SharedPtr()
  {
   if (!ptr_->deref())
   {
    delete ptr_;
    ptr_ = NULL;
   }
  }
  
 };
 
template <class _Ty> template <class _Tu> inline
 SharedPtr<_Ty>& SharedPtr<_Ty>::operator=(PassRefPtr<_Tu>& other)
  {
   ptr_ = other.get();
   ptr_->ref();
   return *this;
  }
 
template <class _Ty> template <class _Tu> inline
 SharedPtr<_Ty>::SharedPtr(PassRefPtr<_Tu>& other):ptr_(other.get())
  {
   ptr_->ref();
  }
}
#endif