// demonstrates the use of destructor
// mikhail nesterenko
// 4/3/2013

#include <iostream>

using std::cout; using std::endl;

// just a class with two member functions
class myclass{
public:
     myclass();
     myclass(const myclass&); // copy constructor
			      // have to pass another
			      // object by reference (why?)
			      // const is used for safety
     ~myclass(); // desctructor
     void setpint(int i){*pint=i;};
     void printdata();
private:
     int *pint;
};

// void constructor - allocates location for integer
// variable
myclass::myclass(){
    pint=new int;
}

// copy constructor - copies the value held in the
// memory location rather than the pointer
myclass::myclass(const myclass &o){
    pint=new int;
    *pint=*(o.pint);
}


// destructor, deallocates the dynamic variable
myclass::~myclass(){
  delete pint;
}


// prints the value of the member variable
void myclass::printdata(){
   cout <<  "the value stored in the object is: ";
   cout <<  *pint; 
   cout <<  endl;
}


void otherfunc(myclass); // function that takes object of myclass as parameter
                         // by value

// creates an object of myclass, prints
// its value
int main(){
  myclass ob1;
  ob1.setpint(1);
  otherfunc(ob1);
  ob1.printdata();
}

void otherfunc(myclass p){
   p.printdata();
   // changing the value
   // stored in o
   // note - the value in ob1 is
   // not changed
   p.setpint(2);
   p.printdata();
} // destructor is implicitly invoked here