Add Serialize/Deserialize for std types that provide interior mutability

Fixes #179

serde/src/de/impls.rs

@@ -43,6 +43,11 @@ use alloc::arc::Arc;
 #[cfg(all(feature = "alloc", not(feature = "std")))]
 use alloc::boxed::Box;
 
+use core::cell::{Cell, RefCell};
+
+#[cfg(feature = "std")]
+use std::sync::{Mutex, RwLock};
+
 #[cfg(feature = "std")]
 use std::time::Duration;
 
@@ -1106,6 +1111,44 @@ impl<'a, T: ?Sized> Deserialize for Cow<'a, T>
     }
 }
 
+impl<T: Deserialize + Copy> Deserialize for Cell<T> {
+    fn deserialize<D>(deserializer: D) -> Result<Cell<T>, D::Error>
+        where D: Deserializer
+    {
+        let val = try!(Deserialize::deserialize(deserializer));
+        Ok(Cell::new(val))
+    }
+}
+
+impl<T: Deserialize> Deserialize for RefCell<T> {
+    fn deserialize<D>(deserializer: D) -> Result<RefCell<T>, D::Error>
+        where D: Deserializer
+    {
+        let val = try!(Deserialize::deserialize(deserializer));
+        Ok(RefCell::new(val))
+    }
+}
+
+#[cfg(feature = "std")]
+impl<T: Deserialize> Deserialize for Mutex<T> {
+    fn deserialize<D>(deserializer: D) -> Result<Mutex<T>, D::Error>
+        where D: Deserializer
+    {
+        let val = try!(Deserialize::deserialize(deserializer));
+        Ok(Mutex::new(val))
+    }
+}
+
+#[cfg(feature = "std")]
+impl<T: Deserialize> Deserialize for RwLock<T> {
+    fn deserialize<D>(deserializer: D) -> Result<RwLock<T>, D::Error>
+        where D: Deserializer
+    {
+        let val = try!(Deserialize::deserialize(deserializer));
+        Ok(RwLock::new(val))
+    }
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 // This is a cleaned-up version of the impl generated by:

serde/src/de/mod.rs

@@ -64,6 +64,10 @@
 //!    - Rc\<T\>
 //!    - Arc\<T\>
 //!    - Cow\<'a, T\>
+//!    - Cell\<T\>
+//!    - RefCell\<T\>
+//!    - Mutex\<T\>
+//!    - RwLock\<T\>
 //!  - **Collection types**:
 //!    - BTreeMap\<K, V\>
 //!    - BTreeSet\<T\>

serde/src/ser/impls.rs

@@ -36,6 +36,11 @@ use alloc::arc::Arc;
 #[cfg(all(feature = "alloc", not(feature = "std")))]
 use alloc::boxed::Box;
 
+use core::cell::{Cell, RefCell};
+
+#[cfg(feature = "std")]
+use std::sync::{Mutex, RwLock};
+
 use core::marker::PhantomData;
 
 #[cfg(feature = "unstable")]
@@ -586,6 +591,58 @@ impl<'a, T: ?Sized> Serialize for Cow<'a, T>
     }
 }
 
+impl<T> Serialize for Cell<T>
+    where T: Serialize + Copy
+{
+    #[inline]
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where S: Serializer
+    {
+        self.get().serialize(serializer)
+    }
+}
+
+impl<T> Serialize for RefCell<T>
+    where T: Serialize
+{
+    #[inline]
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where S: Serializer
+    {
+        self.borrow().serialize(serializer)
+    }
+}
+
+#[cfg(feature = "std")]
+impl<T> Serialize for Mutex<T>
+    where T: Serialize
+{
+    #[inline]
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where S: Serializer
+    {
+        match self.lock() {
+            Ok(locked) => locked.serialize(serializer),
+            Err(_) => Err(S::Error::custom("lock poison error while serializing")),
+        }
+    }
+}
+
+#[cfg(feature = "std")]
+impl<T> Serialize for RwLock<T>
+    where T: Serialize
+{
+    #[inline]
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where S: Serializer
+    {
+        match self.read() {
+            Ok(locked) => locked.serialize(serializer),
+            Err(_) => Err(S::Error::custom("lock poison error while serializing")),
+        }
+    }
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 impl<T, E> Serialize for Result<T, E>

serde/src/ser/mod.rs

@@ -61,6 +61,10 @@
 //!    - Rc\<T\>
 //!    - Arc\<T\>
 //!    - Cow\<'a, T\>
+//!    - Cell\<T\>
+//!    - RefCell\<T\>
+//!    - Mutex\<T\>
+//!    - RwLock\<T\>
 //!  - **Collection types**:
 //!    - BTreeMap\<K, V\>
 //!    - BTreeSet\<T\>