X-Git-Url: https://git.xandkar.net/?p=hope.git;a=blobdiff_plain;f=src%2Fhope_option.erl;fp=src%2Fhope_option.erl;h=2bd9e7b05180a436993afd3d54ff5e2d563565c2;hp=29836f768668a507931dd10572984b8c22755f63;hb=5fab324af707977a6e08246757acd09e1a3cb7c1;hpb=4744fed98ce752dde11c03aeaf8d90983efe5ea6

diff --git a/src/hope_option.erl b/src/hope_option.erl
index 29836f7..2bd9e7b 100644
--- a/src/hope_option.erl
+++ b/src/hope_option.erl
@@ -19,6 +19,7 @@
     , iter/2
     , of_result/1
     , of_undefined/1
+    , to_undefined/1
     , validate/2
     ]).
 
@@ -85,6 +86,11 @@ of_result({error, _}) -> none.
 of_undefined(undefined) -> none;
 of_undefined(X)         -> {some, X}.
 
+-spec to_undefined(t(A)) ->
+    undefined | A.
+to_undefined(none)      -> undefined;
+to_undefined({some, X}) -> X.
+
 -spec validate(t(A), fun((A) -> boolean())) ->
     t(A).
 validate(none, _) ->