feat(t-rules::OrderedPair): get rid of unnecessary Clone bound on T for Serialize

crates/topola-rules/src/lib.rs

@@ -12,13 +12,12 @@ use alloc::borrow::Cow;
 use core::ops;
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
-#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
+#[cfg_attr(feature = "serde", derive(serde::Deserialize))]
-#[cfg_attr(feature = "serde", serde(from = "(T, T)", into = "(T, T)"))]
+#[cfg_attr(feature = "serde", serde(from = "(T, T)", into = "&(T, T)"))]
 #[cfg_attr(
     feature = "serde",
     serde(bound(
         deserialize = "T: serde::Deserialize<'de> + Ord",
-        serialize = "T: serde::Serialize + Clone"
     ))
 )]
 pub struct OrderedPair<T>(T, T);
@@ -49,6 +48,34 @@ impl<T> From<OrderedPair<T>> for (T, T) {
     }
 }
 
+impl<'a, T> From<&'a OrderedPair<T>> for (&'a T, &'a T) {
+    #[inline(always)]
+    fn from(OrderedPair(a, b): &'a OrderedPair<T>) -> (&'a T, &'a T) {
+        (a, b)
+    }
+}
+
+#[cfg(feature = "serde")]
+impl<T: serde::Serialize> serde::Serialize for OrderedPair<T> {
+    #[inline]
+    fn serialize<S: serde::Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
+        use serde::ser::SerializeTuple;
+        let mut tuple = match serializer.serialize_tuple(2) {
+            Ok(x) => x,
+            Err(e) => return Err(e),
+        };
+        match tuple.serialize_element(&self.0) {
+            Ok(x) => x,
+            Err(e) => return Err(e),
+        }
+        match tuple.serialize_element(&self.1) {
+            Ok(x) => x,
+            Err(e) => return Err(e),
+        }
+        tuple.end()
+    }
+}
+
 #[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 pub struct Conditions<'a, K> {