C++ :: Initializing Base Class Part From Derived Object Using Copy Constructor

class Base
{
char * ptr;
public:
Base(){}
Base(char * str)

[code].....

Obj1 is a derived class object where base class char pointer is initialized with "singh" and derived class char pointer is initilized with "sunil". I want to create Obj2 out of Obj1. Separate memory should be created for Obj2 char pointer (base part and derived part as well) and that should be initialized with the strings contained in Obj1.

Here the problem is: Derived class part can be initialized with copy constructor. How to initialize the base class char poniter of Obj2 with the base class part of Obj1. char pointers in
both the classes are private.

I tried using initializer list but could not succeed.

Is there some proper way to do this?