CORBA35 — C++ boxed value member clashes

Summary: For boxed values that are structs, unions, or other constructed types with
member accessor and modifier functions, their member functions such as
value(), boxed_in(), boxed_inout(), etc. may potentially clash with the
names of those accessor and modifier functions.

Solution: make the names of such special member functions start with an
underscore, e.g., _value(), _boxed_in().