Smart pointer (use count)

Smart pointer (use count)
STL smart pointer usage

Auto_ptr

  
   
Pi (new int (1024 ));

  

Define smart pointer class (use count)

Implementation Code:

Class RealPtr {friend class AutoPtr; int * ip; size_t use; RealPtr (int * p): ip (p), use (1 ){}~ RealPtr () {delete ip ;}}; class AutoPtr {public: AutoPtr (int * p): ptr (new RealPtr (p) {} AutoPtr (const AutoPtr & orig ): ptr (orig. ptr) {++ ptr-> use;} AutoPtr & operator = (const AutoPtr & rhs) {++ rhs. ptr-> use; if (-- ptr-> use = 0) delete ptr; ptr = rhs. ptr; return * this ;}~ AutoPtr () {if (-- ptr-> use = 0) delete ptr;} int * get_ptr () const {return ptr-> ip;} void set_ptr (int * p) const {ptr-> ip = p;} int get_ptr_val () const {return * ptr-> ip;} void set_ptr_val (int I) {* ptr-> ip = I ;} private: RealPtr * ptr ;};