A name can be hidden by an explicit declaration of the same name in an enclosed block or in a class. A hidden class member is still accessible using the scope modifier with a class name: X::M. A hidden file scope (global) name can be referenced with the unary operator :: (for example, ::g). A class name X can be hidden by the name of an object, function, or enumerator declared within the scope of X, regardless of the order in which the names are declared. However, the hidden class name X can still be accessed by prefixing X with the appropriate keyword: class, struct, or union. 

The point of declaration for a name x is immediately after its complete declaration but before its initializer, if one exists.