First draft at extending option

dgrnbrg · May 30, 2017 · eb159ad · eb159ad
1 parent 62627ed
commit eb159ad
Showing 1 changed file with 11 additions and 0 deletions.
diff --git a/src/error_chain.rs b/src/error_chain.rs
@@ -323,6 +323,17 @@ macro_rules! error_chain_processed {
             }
         }
 
+        impl<T, E> $result_ext_name<T, E> for ::std::option::Option<T> where E: ::std::error::Error + Send + 'static {
+            fn chain_err<F, EK>(self, callback: F) -> ::std::result::Result<T, $error_name>
+                where F: FnOnce() -> EK,
+                      EK: Into<$error_kind_name> {
+                self.ok_or_else(move || {
+                    let state = $crate::State::default();
+                    $crate::ChainedError::new(callback().into(), state)
+                })
+            }
+        }
+
 
     };
 }