Item 33: Avoid Hiding Inherited Names

Names in derived class hides names in base class (virtual won’t changes this, it only tells runtime to lookup vptr table), which is usually undesirable. To make hidden names visible again, employ using declarations or employ forwarding functions. (This is especially annoying when base class defines a group of overloaded functions.)

Name lookup order:

• Local
• This class
• Base class
• Namespace(s) containing this class
• Global

Note: If base class has overloaded function, and you want to redefine or override only some of them, you must include a using declaration to make base class’ names visible again.

Template brings a whole new different story.