implement serialization for atomic integer types

serde/src/ser/impls.rs

@@ -839,3 +839,55 @@ where
         self.0.serialize(serializer)
     }
 }
+
+////////////////////////////////////////////////////////////////////////////////
+#[cfg(feature = "std")]
+use std::sync::atomic;
+
+#[cfg(feature = "std")]
+macro_rules! atomic_impl {
+    ($ty:path, $method:ident $($cast:tt)*) => {
+        impl Serialize for $ty {
+            #[inline]
+            fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+            where
+                S: Serializer,
+            {
+                serializer.$method(self.load(atomic::Ordering::SeqCst) $($cast)*)
+            }
+        }
+    }
+}
+
+#[cfg(feature = "std")]
+atomic_impl!(atomic::AtomicBool, serialize_bool);
+
+#[cfg(feature = "std")]
+atomic_impl!(atomic::AtomicI8, serialize_i8);
+
+#[cfg(feature = "std")]
+atomic_impl!(atomic::AtomicI16, serialize_i16);
+
+#[cfg(feature = "std")]
+atomic_impl!(atomic::AtomicI32, serialize_i32);
+
+#[cfg(feature = "std")]
+atomic_impl!(atomic::AtomicI64, serialize_i64);
+
+#[cfg(feature = "std")]
+atomic_impl!(atomic::AtomicIsize, serialize_i64 as i64);
+
+#[cfg(feature = "std")]
+atomic_impl!(atomic::AtomicU8, serialize_u8);
+
+#[cfg(feature = "std")]
+atomic_impl!(atomic::AtomicU16, serialize_u16);
+
+#[cfg(feature = "std")]
+atomic_impl!(atomic::AtomicU32, serialize_u32);
+
+#[cfg(feature = "std")]
+atomic_impl!(atomic::AtomicU64, serialize_u64);
+
+#[cfg(feature = "std")]
+atomic_impl!(atomic::AtomicUsize, serialize_u64 as u64);