What is deep copy constructor?

Deep Copy:
Overriding default copy constructor with a constructor which copies all the members including all dynamically allocated members is called deep copy constructor.

Example

#include<string.h>
#include<iostream.h>
class User
{
  protected:
  int user_id;
  char *user_name;
  public:
  User()
  {
    user_id = 0;
    user_name = new char[10];
  }
  ~ User()
  {
    user_id = 0;
    delete [] user_name;
  }
  int get_id()
  {
    return user_id;
  }
  void set_id(int id)
  {
    user_id = id;
  }
  char* get_name(void)
  {
    return user_name;
  }
  void set_name(char* name)
  {
    strcpy(user_name, name);
  }
  User(User &u)
  {
    user_id = u. user_id;
    user_name = new char[10];
    strcpy(user_name, u.user_name);
  }
  User & operator = (User &u)
  {
    user_id = u. user_id;
    strcpy(user_name, u.user_name);
    return *this;
  }
};
void main(int argc, char *argv[])
{
  User user1;
  user1.set_id(1);
  user1.set_name("User1");
  User user2(user1);
  cout << "User1 id " << user1 .get_id()
       << ", User1 name " << user1 .get_name() << endl;
  cout << "User2 id " << user2 .get_id() 
       << ", User2 name " <<user2 .get_name() << endl;
  cout.flush();
  user1.set_id(2);
  user2.set_name("User2");
  cout << "User1 id " << user1.get_id() 
       << ", User1 name " << user1 .get_name() << endl;
  cout << "User2 id " <<user2.get_id()
       << ", User2 name "<<user2 .get_name() << endl;
  cout.flush();
}

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