WIP: move to static props

packages/recoil/src/tracingimmap.rs

@@ -0,0 +1,29 @@
+//! Tracing immap
+//! Traces modifications since last generation
+//! To reconstruct the history, you will need *all* the generations between the start and end points
+
+use im_rc::HashMap as ImMap;
+
+pub struct TracedHashMap<K, V> {
+    inner: ImMap<K, V>,
+    generation: u32,
+    mods_since_last_gen: Vec<K>,
+}
+
+impl<K: Clone, V: Clone> TracedHashMap<K, V> {
+    fn next_generation(&self) -> Self {
+        Self {
+            generation: self.generation + 1,
+            inner: self.inner.clone(),
+            mods_since_last_gen: vec![],
+        }
+    }
+}
+
+#[test]
+fn compare_dos() {
+    let map1 = im_rc::hashmap! {3 => 2, 2 => 3};
+    let map2 = im_rc::hashmap! {2 => 3, 3 => 2};
+
+    assert_eq!(map1, map2);
+}