CXXD_UNORDERED_MAP_USE_BOOST — Override macro for Boost unordered map implementation.
// In header: <boost/cxx_dual/impl/unordered_map.hpp> CXXD_UNORDERED_MAP_USE_BOOST
The object-like macro, when defined to nothing prior to including this header file, forces the dual library choice of the Boost unordered map implementation.
