BOOST_STATIC_ASSERT(boost::type_of::test<void()>::value);
BOOST_STATIC_ASSERT(boost::type_of::test<double(bool)>::value);
+BOOST_STATIC_ASSERT(boost::type_of::test<void(...)>::value);
+BOOST_STATIC_ASSERT(boost::type_of::test<float(int, ...)>::value);