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