CXXD_CONDITION_VARIABLE_HEADER — The condition variable header file name.
// In header: <boost/cxx_dual/impl/condition_variable.hpp> CXXD_CONDITION_VARIABLE_HEADER
The object-like macro expands to the include header file designation for the condition variable header file. The macro is used with the syntax: #include CXXD_CONDITION_VARIABLE_HEADER
