X-Git-Url: https://git.xandkar.net/?a=blobdiff_plain;f=src%2Fhope_result.erl;h=44f3ddd58b92e21ba0941e4d274b31d495fd68c9;hb=70cf8e86a06d8721fcc8b658bb2be1f7b401326f;hp=5d0ea7e42c40521a8a24f65b0fa0ce7f4701153c;hpb=ed9905af6fa1dba6f89759d6dbfc970426122bde;p=hope.git

diff --git a/src/hope_result.erl b/src/hope_result.erl
index 5d0ea7e..44f3ddd 100644
--- a/src/hope_result.erl
+++ b/src/hope_result.erl
@@ -7,6 +7,7 @@
 
 -export(
     [ pipe/2
+    , lift_exn/1
     ]).
 
 
@@ -23,9 +24,26 @@
        , Error :: any()
        , F     :: fun((X) -> t(Ok, Error))
        .
-pipe([]    , X) -> X;
+pipe([], X) ->
+    {ok, X};
 pipe([F|Fs], X) ->
     case F(X)
     of  {error, _}=E -> E
     ;   {ok, Y}      -> pipe(Fs, Y)
     end.
+
+-spec lift_exn(F) -> G
+    when F     :: fun((A)-> B)
+       , G     :: fun((A)-> t(B, {Class, Reason :: any()}))
+       , Class :: error
+                | exit
+                | throw
+       .
+lift_exn(F) when is_function(F, 1) ->
+    fun(X) ->
+        try
+            {ok, F(X)}
+        catch Class:Reason ->
+            {error, {Class, Reason}}
+        end
+    end.