Add serialization to RandomState struct

Cargo.toml

@@ -24,6 +24,7 @@ doc = true
 
 [features]
 default = ["std", "runtime-rng"]
+serde = ["serde/derive"]
 
 # Enabling this will enable `AHashMap` and `AHashSet`.
 std = []
@@ -101,6 +102,7 @@ pcg-mwc = "0.2.1"
 serde_json = "1.0.59"
 hashbrown = "0.14.3"
 smallvec = "1.13.1"
+bincode = "1.3.3"
 
 [package.metadata.docs.rs]
 rustc-args = ["-C", "target-feature=+aes"]

src/random_state.rs

@@ -1,4 +1,8 @@
 use core::hash::Hash;
+
+#[cfg(feature = "serde")]
+use serde::{Deserialize, Serialize};
+
 cfg_if::cfg_if! {
     if #[cfg(any(
         all(any(target_arch = "x86", target_arch = "x86_64"), target_feature = "aes", not(miri)),
@@ -211,6 +215,7 @@ cfg_if::cfg_if! {
 /// |`with_seed`    | Fixed per process   |`u64` + static random number|
 /// |`with_seeds`   | Fixed               |`u64` x 4|
 ///
+#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
 #[derive(Clone)]
 pub struct RandomState {
     pub(crate) k0: u64,
@@ -504,6 +509,20 @@ mod test {
         assert_ne!(PI, get_fixed_seeds()[0]);
     }
 
+    #[cfg(all(feature = "serde"))]
+    #[test]
+    fn test_serialize() {
+        let rs = RandomState::new();
+
+        let serialized = bincode::serialize(&rs).expect("failed to serialize");
+        let deserialized: RandomState = bincode::deserialize(&serialized).expect("failed to deserialize");
+
+        assert_eq!(rs.k0, deserialized.k0);
+        assert_eq!(rs.k1, deserialized.k1);
+        assert_eq!(rs.k2, deserialized.k2);
+        assert_eq!(rs.k3, deserialized.k3);
+    }
+
     #[cfg(all(feature = "compile-time-rng", any(not(feature = "runtime-rng"), test)))]
     #[test]
     fn test_not_pi_const() {