Copy All parts of an Object

copyConstructor.cpp

//Item 12  from effective c++


//helper function to make a log entry
void logCall(const std::string & name);//make a log entry

//base class
class Customer  
{
  public:
    Customer(const Customer & rhs);
    Customer& operator = (const Customer & rhs);
  private:
    std::string name;
};


//derived class
class PriorityCustomer:public Customer
{
  public:
   PriorityCustomer(const PriorityCustomer & rhs);
   priotityCustomer & operator = (const PriorityCustomer & rhs);
  
  private:
  int priority;
  
}

Rememebre:
When you are writing a copying function(copy ctor + assignment operator) ,be sure to
(1)Copy all the local data members
(2)invoke the appropriate copying functions in all the base classes too.

Note:we can create a function init() as private data members and avoid code duplication between copy ctor and assignment copy ctor