19. Things to watch out for

• Compiler-generated assignment and copy constructors include the base classes automatically.

• However, if you define your own, they are not automatically inherited.

• Thus, you have to chain to the base classes manually. For example,

• 
  Derived& Derived::operator=( Derived const& other )
  {
      if ( &other == this )
          return *this;
  
      Base::operator=( other );
  }