small refactoring

1 files changed, 18 insertions, 0 deletions

diff --git a/src/ord_adaptor.rs b/src/ord_adaptor.rs
new file mode 100644
index 0000000..c7c6763
--- /dev/null
+++ b/src/ord_adaptor.rs
@@ -0,0 +1,18 @@
+//! Newtypes to use floating numbers in sorting algs
+
+use std::cmp::Ordering;
+
+/// Defaults to `Ordering::Less` if the wrapped value can't be compared
+#[derive(PartialEq, PartialOrd)]
+#[repr(transparent)]
+pub struct DefaultLess<T: PartialOrd>(pub T);
+
+// Not ideal, but `Ord` requires `Eq`, so...
+impl<T: PartialOrd> Eq for DefaultLess<T> {}
+
+#[allow(clippy::derive_ord_xor_partial_ord)]
+impl<T: PartialOrd> Ord for DefaultLess<T> {
+    fn cmp(&self, other: &Self) -> Ordering {
+        self.partial_cmp(other).unwrap_or(Ordering::Less)
+    }
+}