163 #define next_comb(I, L1, L2)						\  argument
166 	if ((I).j >= (L2)->size) {					\
174 #define label_for_each_comb(I, L1, L2, P1, P2)				\  argument
176 	((P1) = (L1)->vec[(I).i]) && ((P2) = (L2)->vec[(I).j]);		\
177 	(I) = next_comb(I, L1, L2))
179 #define fn_for_each_comb(L1, L2, P1, P2, FN)				\  argument
183 	label_for_each_comb(i, (L1), (L2), (P1), (P2)) {		\
243 #define fn_for_each2_XXX(L1, L2, P, FN, ...)				\  argument
247 	label_for_each ## __VA_ARGS__(i, (L1), (L2), (P)) {		\
253 #define fn_for_each_in_merge(L1, L2, P, FN)				\  argument
254 	fn_for_each2_XXX((L1), (L2), P, FN, _in_merge)
255 #define fn_for_each_not_in_set(L1, L2, P, FN)				\  argument
256 	fn_for_each2_XXX((L1), (L2), P, FN, _not_in_set)