  #    define BOOST_PP_WHILE_P(n) BOOST_PP_BITAND(BOOST_PP_CAT(BOOST_PP_WHILE_CHECK_, BOOST_PP_WHILE_ ## n(BOOST_PP_WHILE_F, BOOST_PP_NIL, BOOST_PP_NIL)), BOOST_PP_CAT(BOOST_PP_LIST_FOLD_LEFT_CHECK_, BOOST_PP_LIST_FOLD_LEFT_ ## n(BOOST_PP_NIL, BOOST_PP_NIL, BOOST_PP_NIL)))