Merge branch 'option-support'

1 files changed, 4 insertions, 3 deletions

diff --git a/src/backend/mod.rs b/src/backend/mod.rs
index 1353a6d..3f72d66 100644
--- a/src/backend/mod.rs
+++ b/src/backend/mod.rs
@@ -1,8 +1,8 @@
 pub mod dialoguer;
 
-use crate::ValueBuilder;
 use crate::BuildableValue;
 use crate::CollectionBuilder;
+use crate::ValueBuilder;
 
 /// A backend can be used to get builders for specific types
 pub trait Backend {
@@ -26,9 +26,10 @@ pub trait Backend {
     fn char_builder(&self)   -> Box<dyn ValueBuilder<Output = char, Error = Self::Error>>;
     fn string_builder(&self) -> Box<dyn ValueBuilder<Output = String, Error = Self::Error>>;
 
+    fn option_builder<T: 'static + BuildableValue>(&self) -> Box<dyn CollectionBuilder<Output = Option<T>, Error = Self::Error>>;
+
     fn vec_builder<T>(&self) -> Box<dyn CollectionBuilder<Output = Vec<T>, Error = Self::Error>>
-        where T: 'static + BuildableValue
-            ;
+        where T: 'static + BuildableValue;
 }