utils: add MapTryInto

easytier/src/utils.rs

@@ -161,3 +161,16 @@ pub trait DeterministicDigest: Serialize {
 }
 
 impl<S: Serialize> DeterministicDigest for S {}
+
+pub trait MapTryInto<S> {
+    fn map_try_into<T: TryFrom<S>>(self) -> impl Iterator<Item = Result<T, T::Error>>;
+}
+
+impl<I, S> MapTryInto<S> for I
+where
+    I: IntoIterator<Item = S>,
+{
+    fn map_try_into<T: TryFrom<S>>(self) -> impl Iterator<Item = Result<T, T::Error>> {
+        self.into_iter().map(T::try_from)
+    }
+}