// shared_ptr.cc 
#include <iostream>
#include <memory>
using namespace std;

class MyClass {
  public:
    MyClass() { cout << "Constructing MyClass" << endl; }
    ~MyClass() { cout << "Destructing MyClass" << endl; }
};

void misc_function(shared_ptr<MyClass> p);

int main()
{
  shared_ptr<MyClass> myp(new MyClass);
  // use_count() prints number of references the object pointed to;
  // mainly used for debugging / pedagogical purposes
  cout << "Just created shared pointer myp" << endl;
  cout << myp.use_count() << endl;
  misc_function(myp);
  cout << "Back in main" << endl;
  cout << myp.use_count() << endl;
}

void misc_function(shared_ptr<MyClass> p) {
  // Passed p by value, so now one more reference to original obj
  // while we're in this function
  cout << "In misc_function." << endl;
  cout << p.use_count() << endl;
}