C++ : Object Copies in C++ are based on Object's Static Type Not Dynamic Type

Consider the following piece of code

class Base { ... };
class Derived: public Base { ... };

void passAndThrowDerived()
{
Derived local;
...
Base& rw = local;

throw rw;

}


In the above mentioned case . When a copy of rw is made while throwing it .
The copy constructor for the type is called . In this case the since rw is a reference to Base there fore the copy constructor of Base is called rather than the
Copy Constructor of Derived class.