The direct base class subobjects of C
in the order of their declaration in the base-specifier-list
followed by the non-static data members of C
in the order of their declaration in the member-specification
form a list of subobjects.
In that list, any subobject of array type is recursively expanded
to the sequence of its elements, in the order of increasing subscript.
be an lvalue denoting the ith
in the expanded list of subobjects for an object x
(of length n
formed by a sequence of
derived-to-base conversions ([over.best.ics]
class member access expressions ([expr.ref]
array subscript expressions ([expr.sub]
) applied to x.