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