CXXD_HAS_STD_REF — Determines whether the C++ standard ref implementation or the Boost ref implementation has been chosen.
// In header: <boost/cxx_dual/impl/ref.hpp> CXXD_HAS_STD_REF
The object-like macro expands to: 1 if the C++ standard ref implementation has been chosen 0 if the Boost ref implementation has been chosen.
