CS202   4- ‹#›
nThe dynamic_cast operator relies on information stored in an object by the compiler whenever a direct or indirect base class contains a virtual function. This cast is used when downcasting to determine at run time if the downcast is valid or not.
nThe dynamic_cast operator syntax is
n        dynamic_cast<type*>(expr)
n    where expr is an expression pointing to a direct or indirect base class object and type is a derived class.
nexpr is converted to a pointer of the specified type if the dynamic type of the object pointed to is that type or is a type derived from that type. Otherwise, the result of the cast operation is zero.
dynamic_cast for downcasting