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-rw-r--r--lib/stdlib/src/ordsets.erl16
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).