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