From 71cc95248c4b5aa902be3e8e71b6b087d18e559a Mon Sep 17 00:00:00 2001
From: Erick Tryzelaar <erick.tryzelaar@gmail.com>
Date: Thu, 30 Jul 2015 07:57:46 -0700
Subject: [PATCH] Allow Option<T> to be used directly as a ser::SeqVisitor

---
 serde/src/ser/impls.rs | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/serde/src/ser/impls.rs b/serde/src/ser/impls.rs
index 311e77f9..559f67a0 100644
--- a/serde/src/ser/impls.rs
+++ b/serde/src/ser/impls.rs
@@ -97,6 +97,26 @@ impl<T> Serialize for Option<T> where T: Serialize {
     }
 }
 
+impl<T> SeqVisitor for Option<T> where T: Serialize {
+    #[inline]
+    fn visit<S>(&mut self, serializer: &mut S) -> Result<Option<()>, S::Error>
+        where S: Serializer,
+    {
+        match self.take() {
+            Some(value) => {
+                try!(serializer.visit_seq_elt(value));
+                Ok(Some(()))
+            }
+            None => Ok(None),
+        }
+    }
+
+    #[inline]
+    fn len(&self) -> Option<usize> {
+        Some(if self.is_some() { 1 } else { 0 })
+    }
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 pub struct SeqIteratorVisitor<Iter> {