CXXD_UNORDERED_SET_HEADER — The unordered set header file name.
// In header: <boost/cxx_dual/impl/unordered_set.hpp> CXXD_UNORDERED_SET_HEADER
The object-like macro expands to the include header file designation for the unordered set header file. The macro is used with the syntax: #include CXXD_UNORDERED_SET_HEADER
