title: Binding within Constructors within Constructors
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/962132/calling-virtual-functions-inside-constructors">Calling virtual functions inside constructors</a>  </p>
  </blockquote>
  
  
  
  <p>in C++, An object of class B derived from class A, in C++ the c’tor of A is invoked before the c’tor of B , why ?
  And what happens if A’s C’tor invokes a virtual function? does it invoke A's virtual function of B's ?</p>