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);

test_suite/tests/test_ser.rs

@@ -10,6 +10,7 @@ use std::ops::Bound;
 use std::path::{Path, PathBuf};
 use std::rc::{Rc, Weak as RcWeak};
 use std::sync::{Arc, Weak as ArcWeak};
+use std::sync::atomic;
 use std::time::{Duration, UNIX_EPOCH};
 
 #[cfg(unix)]
@@ -483,6 +484,20 @@ declare_tests! {
             Token::Str("1a"),
         ],
     }
+    test_atomic {
+        atomic::AtomicBool::new(false) => &[Token::Bool(false)],
+        atomic::AtomicBool::new(true) => &[Token::Bool(true)],
+        atomic::AtomicI8::new(63i8) => &[Token::I8(63i8)],
+        atomic::AtomicI16::new(-318i16) => &[Token::I16(-318i16)],
+        atomic::AtomicI32::new(65792i32) => &[Token::I32(65792i32)],
+        atomic::AtomicI64::new(-4295032832i64) => &[Token::I64(-4295032832i64)],
+        atomic::AtomicIsize::new(-65792isize) => &[Token::I64(-65792i64)],
+        atomic::AtomicU8::new(192u8) => &[Token::U8(192u8)],
+        atomic::AtomicU16::new(510u16) => &[Token::U16(510u16)],
+        atomic::AtomicU32::new(131072u32) => &[Token::U32(131072u32)],
+        atomic::AtomicU64::new(12884901888u64) => &[Token::U64(12884901888u64)],
+        atomic::AtomicUsize::new(655360usize) => &[Token::U64(655360u64)],
+    }
 }
 
 declare_tests! {