Add bitcode support

Cargo.toml

@@ -23,6 +23,7 @@ rand = { version = "0.8", optional = true }
 uuid = { version = "1.1", optional = true }
 postgres-types = { version = "0.2.6", optional = true }
 bytes = { version = "1.4.0", optional = true }
+bitcode = { version = "0", features = ["derive"], default-features = false, optional = true }
 
 [target.wasm32-unknown-unknown.dependencies]
 getrandom = { version = "0.2", features = ["js"] }
@@ -31,6 +32,7 @@ web-time = "1"
 [dev-dependencies]
 bencher = "0.1"
 serde_derive = "1.0"
+bitcode = "0.5"
 
 [target.wasm32-unknown-unknown.dev-dependencies]
 wasm-bindgen-test = "0.3"

src/lib.rs

@@ -73,6 +73,7 @@ pub(crate) use bitmask;
 /// Of the 128-bits, the first 48 are a unix timestamp in milliseconds. The
 /// remaining 80 are random. The first 48 provide for lexicographic sorting and
 /// the remaining 80 ensure that the identifier is unique.
+#[cfg_attr(feature = "bitcode", derive(bitcode::Encode, bitcode::Decode))]
 #[derive(Debug, PartialOrd, Ord, PartialEq, Eq, Hash, Clone, Copy)]
 pub struct Ulid(pub u128);
 
@@ -422,3 +423,18 @@ mod tests {
         println!("{}", DecodeError::InvalidChar);
     }
 }
+
+#[cfg(all(test, feature = "std", feature = "bitcode"))]
+mod bitcode_tests {
+    use super::*;
+    use bitcode;
+
+    #[test]
+    fn bitcode_roundtrip() {
+        let ulid = Ulid::new();
+        let encoded: Vec<u8> = bitcode::encode(&ulid).expect("failed to encode");
+        let decoded: Ulid = bitcode::decode(&encoded).expect("failed to decode");
+
+        assert_eq!(ulid, decoded);
+    }
+}