54   struct apply {  struct
55     using type = FoldVector(TransformVector(S, F), Combine, CombineIdentity);
69   struct apply {  struct
70     using type = If(IsInSet(T, S), S, AddToSetUnchecked(S, T));
77   struct apply {  struct
78     struct Helper {
80       struct apply {  struct
81         using type = And(CurrentResult, IsInSet(T, S2));
85     using type = FoldVector(S1, Helper, Bool<true>);
92   struct apply {  struct
93     struct Helper {
95       struct apply {  struct
96         using type = Or(CurrentResult, IsInSet(T, S2));
100     using type = Not(FoldVector(S1, Helper, Bool<false>));
106   struct apply {  struct
112 struct IsEmptySet::apply<Vector<>> {  argument