#include <boost/preprocessor/variadic/opt.hpp>
#if BOOST_PP_VARIADIC_OPT()
// Preprocessor code which uses __VA_OPT__
#else
// Preprocessor code which does not use __VA_OPT__
#endif
Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at www.boost.org/LICENSE_1_0.txt)