diff options
Diffstat (limited to 'lib/stdlib')
| -rw-r--r-- | lib/stdlib/src/ordsets.erl | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/lib/stdlib/src/ordsets.erl b/lib/stdlib/src/ordsets.erl index e992b66714..4c72e351d0 100644 --- a/lib/stdlib/src/ordsets.erl +++ b/lib/stdlib/src/ordsets.erl @@ -26,12 +26,14 @@ -export([subtract/2,is_subset/2]). -export([fold/3,filter/2]). +-export_type([ordset/1]). + -type ordset(T) :: [T]. %% new() -> Set. %% Return a new empty ordered set. --spec new() -> ordset(term()). +-spec new() -> []. new() -> []. @@ -84,7 +86,7 @@ is_element(_, []) -> false. %% add_element(Element, OrdSet) -> OrdSet. %% Return OrdSet with Element inserted in it. --spec add_element(term(), ordset(_)) -> ordset(_). +-spec add_element(E, ordset(T)) -> [T | E,...]. add_element(E, [H|Es]) when E > H -> [H|add_element(E, Es)]; add_element(E, [H|_]=Set) when E < H -> [E|Set]; @@ -94,7 +96,7 @@ add_element(E, []) -> [E]. %% del_element(Element, OrdSet) -> OrdSet. %% Return OrdSet but with Element removed. --spec del_element(term(), ordset(_)) -> ordset(_). +-spec del_element(term(), ordset(T)) -> ordset(T). del_element(E, [H|Es]) when E > H -> [H|del_element(E, Es)]; del_element(E, [H|_]=Set) when E < H -> Set; @@ -104,7 +106,7 @@ del_element(_, []) -> []. %% union(OrdSet1, OrdSet2) -> OrdSet %% Return the union of OrdSet1 and OrdSet2. --spec union(ordset(_), ordset(_)) -> ordset(_). +-spec union(ordset(T1), ordset(T2)) -> ordset(T1 | T2). union([E1|Es1], [E2|_]=Set2) when E1 < E2 -> [E1|union(Es1, Set2)]; @@ -118,7 +120,7 @@ union(Es1, []) -> Es1. %% union([OrdSet]) -> OrdSet %% Return the union of the list of ordered sets. --spec union([ordset(_)]) -> ordset(_). +-spec union([ordset(T)]) -> ordset(T). union([S1,S2|Ss]) -> union1(union(S1, S2), Ss); @@ -206,7 +208,7 @@ is_subset(_, []) -> false. %% fold(Fun, Accumulator, OrdSet) -> Accumulator. %% Fold function Fun over all elements in OrdSet and return Accumulator. --spec fold(fun((_, _) -> _), _, ordset(_)) -> _. +-spec fold(fun((T, term()) -> term()), term(), ordset(T)) -> term(). fold(F, Acc, Set) -> lists:foldl(F, Acc, Set). @@ -214,7 +216,7 @@ fold(F, Acc, Set) -> %% filter(Fun, OrdSet) -> OrdSet. %% Filter OrdSet with Fun. --spec filter(fun((_) -> boolean()), ordset(_)) -> ordset(_). +-spec filter(fun((T) -> boolean()), ordset(T)) -> ordset(T). filter(F, Set) -> lists:filter(F, Set). |