Fix VersionMap no longer being Send+Sync

I overlooked that e00a8b5 was not
part of 0.1.6 and introduced a breaking change, as the `dyn
VersionFilter` field prevented `VersionMap` from being sharable between
threads. As this was previously the case, this meant a breaking change
snuck into a patch release, so 0.1.7 was yanked and instead we need
to release 0.1.8

Signed-off-by: Patrick Roy <[email protected]>

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "versionize"
-version = "0.1.7"
+version = "0.1.8"
 license = "Apache-2.0"
 authors = ["Amazon Firecracker team <[email protected]>"]
 description = "A version tolerant serialization/deserialization framework."

src/version_map.rs

@@ -83,7 +83,7 @@ impl VersionFilter for () {
 #[derive(Clone, Debug)]
 pub struct VersionMap {
     versions: Vec<HashMap<TypeId, u16>>,
-    filter: Arc<dyn VersionFilter>,
+    filter: Arc<dyn VersionFilter + Send + Sync>,
 }
 
 impl Default for VersionMap {
@@ -102,7 +102,7 @@ impl VersionMap {
     }
 
     /// Create a new version map with specified version filter.
-    pub fn with_filter(filter: Arc<dyn VersionFilter>) -> Self {
+    pub fn with_filter(filter: Arc<dyn VersionFilter + Send + Sync>) -> Self {
         VersionMap {
             versions: vec![HashMap::new(); 1],
             filter,
@@ -220,6 +220,13 @@ mod tests {
         }
     }
 
+    #[test]
+    fn test_version_map_is_send_and_sync() {
+        fn assert_send_sync<T: Send + Sync>() {}
+
+        assert_send_sync::<VersionMap>();
+    }
+
     #[test]
     fn test_app_versions_with_gap() {
         let my_type_id = TypeId::of::<MyType>();