#ifndef SMARTPOINTER_HPP__
#define SMARTPOINTER_HPP__

#include <iostream>

template<typename T>
class sp {
public:
   sp(T* ptr) : ptr_(ptr), ref_cnt_(1) {
      std::cout << "sp ctor: " << ptr_ << ", ref_cnt_: " << ref_cnt_ << std::endl;
   }

   T& operator*() { return *ptr_; }

   T* operator->() { return ptr_; }

   sp(const sp<T>& rhs) : ptr_(rhs.ptr_), ref_cnt_(rhs.ref_cnt_) {
      ++ref_cnt_;
      std::cout << "sp copy ctor: " << ptr_ << ", ref_cnt_: " << ref_cnt_ << std::endl;
   }

   sp& operator=(const sp& rhs) {
      if(this != &rhs) {
         *this = rhs;
         ++ref_cnt_;
         std::cout << "sp assignment: " << ptr_ << ", ref_cnt_: " << ref_cnt_ << std::endl;
      }
      return *this;
   }

   ~sp() {
     if(ptr_)
       std::cout << "~sp: " << ptr_ << ", ref count: " << ref_cnt_ << std::endl;
       --ref_cnt_;
       if(ref_cnt_ == 0)
         delete ptr_;
   }

   bool operator==(const T& that) const { return ptr_ == that.ptr_; }
   bool operator==(T* that) const { return ptr_ == that; }

   bool operator!=(const sp& that) const { return ptr_ != that.ptr_; }
   bool operator!=(sp* that) const { return ptr_ != that; }


private:
   T* ptr_;
   unsigned ref_cnt_;
};


#endif //SMARTPOINTER_HPP__

#include <iostream>
#include <string.h>

#include "smart_pointer.hpp"

class name {
public:
   name(const char* label) : label_(label) {}

   const char* get_name() const { return label_; }
   unsigned length() const { return strlen(label_); }

private:
  const char* label_;
};

int main() {

   {
      std::cout << "Test with intsn";
      sp<int> myptr1 = new int(3);
      *myptr1 = 4;
      std::cout << "number: " << *myptr1 << std::endl;

      sp<int> myp2(myptr1);

      sp<int> myp3(myptr1);

      sp<int> myp4 = myptr1;
   }


   {
     std::cout << "Test with name objectn";
     sp<name> myname = new name("Andrew");
     std::cout << myname->get_name() << " has length: " << myname->length() << std::endl;
     sp<name> myname2(myname);
   }

   return 0;
}

Test with ints
sp ctor: 004C7A80, ref_cnt_: 1
number: 4
sp copy ctor: 004C7A80, ref_cnt_: 2
sp copy ctor: 004C7A80, ref_cnt_: 2
sp copy ctor: 004C7A80, ref_cnt_: 2
~sp: 004C7A80, ref count: 2
~sp: 004C7A80, ref count: 2
~sp: 004C7A80, ref count: 2
~sp: 004C7A80, ref count: 1
Test with name object
sp ctor: 004C7A80, ref_cnt_: 1
Andrew has length: 6
sp copy ctor: 004C7A80, ref_cnt_: 2
~sp: 004C7A80, ref count: 2
~sp: 004C7A80, ref count: 1