X-Git-Url: https://git.xandkar.net/?a=blobdiff_plain;f=src%2Fhope_option.erl;h=d820b7bc90b2d10ba719508c8f4182c08497c678;hb=27a4f25fb636bbff0f8085d66e433125dc5fe17d;hp=92636c9f7191689526783806cbf85c0e9a7599fb;hpb=3b156801097bcd07272f1db3a62a675495fa9d77;p=hope.git

diff --git a/src/hope_option.erl b/src/hope_option.erl
index 92636c9..d820b7b 100644
--- a/src/hope_option.erl
+++ b/src/hope_option.erl
@@ -1,5 +1,6 @@
 -module(hope_option).
 
+
 -export_type(
     [ t/1
     ]).
@@ -8,6 +9,7 @@
     [ put/2
     , get/2
     , map/2
+    , iter/2
     ]).
 
 
@@ -17,16 +19,25 @@
     .
 
 
+-spec put(A, fun((A) -> boolean())) ->
+    t(A).
 put(X, F) ->
     case F(X)
     of  true  -> {some, X}
     ;   false -> none
     end.
 
-
+-spec get(t(A), Default :: A) ->
+    A.
 get({some, X}, _) -> X;
 get(none     , Y) -> Y.
 
-
+-spec map(t(A), fun((A) -> (B))) ->
+    t(B).
 map({some, X}, F) -> {some, F(X)};
 map(none     , _) -> none.
+
+-spec iter(t(A), fun((A) -> (ok))) ->
+    ok.
+iter({some, X}, F) -> ok = F(X);
+iter(none     , _) -> ok.