role of copy constructor, C++ (gcc)

role of copy constructor

#include <iostream>

using namespace std;

class Line {

public:
    static int i;
      int getLength( void );
      Line( int len );             // simple constructor
      Line( const Line &obj);  // copy constructor
      ~Line();                     // destructor

private:
      int *ptr;
    
};
 int Line::i=0;
// Member functions definitions including constructor
Line::Line(int len) {
   cout << "Normal constructor allocating ptr" << endl;
   
   // allocate memory for the pointer;
   ptr = new int;
   *ptr = len;
    Line::i++;
}

Line::Line(const Line &obj) {
   cout << "Copy constructor allocating ptr." << endl;
   ptr = new int;
   *ptr = *obj.ptr; // copy the value
    Line::i++;
}

Line::~Line(void) {
   cout << "Freeing memory!" << endl;
   delete ptr;
}

int Line::getLength( void ) {
   return *ptr;
}

void display(Line obj) {
   cout << "Length of line : " << obj.getLength() <<endl;
}

// Main function for the program
int main() {
   Line line(10);

display(line);
    cout<<"\n"<<Line::i<<"\n";

return 0;
}


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