diff options
Diffstat (limited to 'lib/predicate.ml')
| -rw-r--r-- | lib/predicate.ml | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/lib/predicate.ml b/lib/predicate.ml index a60b3dad..1aa7db6a 100644 --- a/lib/predicate.ml +++ b/lib/predicate.ml @@ -10,8 +10,6 @@ (* *) (************************************************************************) -(* Sets over ordered types *) - module type OrderedType = sig type t @@ -43,9 +41,10 @@ module Make(Ord: OrderedType) = struct module EltSet = Set.Make(Ord) - (* when bool is false, the denoted set is the complement of - the given set *) type elt = Ord.t + + (* (false, s) represents a set which is equal to the set s + (true, s) represents a set which is equal to the complement of set s *) type t = bool * EltSet.t let elements (b,s) = (b, EltSet.elements s) @@ -84,6 +83,7 @@ module Make(Ord: OrderedType) = let diff s1 s2 = inter s1 (complement s2) + (* assumes the set is infinite *) let subset s1 s2 = match (s1,s2) with ((false,p1),(false,p2)) -> EltSet.subset p1 p2 @@ -91,6 +91,7 @@ module Make(Ord: OrderedType) = | ((false,p1),(true,n2)) -> EltSet.is_empty (EltSet.inter p1 n2) | ((true,_),(false,_)) -> false + (* assumes the set is infinite *) let equal (b1,s1) (b2,s2) = b1=b2 && EltSet.equal s1 s2 |