Merge pull request #1045 from ZetaNumbers/value-ref-into-deserializer

Implement IntoDeserializer for &Value

Author: dtolnay

src/value/de.rs

@@ -482,6 +482,14 @@ impl<'de> IntoDeserializer<'de, Error> for Value {
     }
 }
 
+impl<'de> IntoDeserializer<'de, Error> for &'de Value {
+    type Deserializer = Self;
+
+    fn into_deserializer(self) -> Self::Deserializer {
+        self
+    }
+}
+
 struct VariantDeserializer {
     value: Option<Value>,
 }

tests/test.rs

@@ -2472,6 +2472,12 @@ fn test_value_into_deserializer() {
     let mut map = BTreeMap::new();
     map.insert("inner", json!({ "string": "Hello World" }));
 
+    let outer = Outer::deserialize(serde::de::value::MapDeserializer::new(
+        map.iter().map(|(k, v)| (*k, v)),
+    ))
+    .unwrap();
+    assert_eq!(outer.inner.string, "Hello World");
+
     let outer = Outer::deserialize(map.into_deserializer()).unwrap();
     assert_eq!(outer.inner.string, "Hello World");
 }