#4.1

Main.cpp

// ISU laboratory session #9, exercise #4-1.

#include <iostream>  
#include <string>  
#include <boost/shared_ptr.hpp>  
   
using namespace std;  
   
int main() 
{
  {
    boost::shared_ptr<string> ss1(new string("Hello world!"));  
    boost::shared_ptr<string> ss2(new string("Hej verden!"));  
   
    cout << "ss1: " << ss1.use_count() << endl;   
    cout << "ss2: " << ss2.use_count() << endl << endl;  
   
    cout << "Assign ss2 = ss1" << endl;
    ss1 = ss2;  
   
    cout << "ss1: " << ss1.use_count() << endl;   
    cout << "ss2: " << ss2.use_count() << endl << endl;
    
    { // New scope
      cout << "New scope" << endl;
      boost::shared_ptr<string> ss3 = ss1;   
      cout << "ss3: " << ss3.use_count() << endl;
    }
    cout << "End of the new scope" << endl << endl;
    
    cout << "ss2: " << ss2.use_count() << endl << endl;
  }   
  
}