???

crates/moonhare_ecs/src/entity/mod.rs

@@ -0,0 +1,36 @@
+use crate::{entity, generational_index::{GenerationalIndex, GenerationalIndexAllocator}};
+
+#[derive(Debug, PartialEq, PartialOrd, Eq, Ord, Clone, Copy, Hash)]
+pub struct Entity(GenerationalIndex);
+
+impl Entity {
+    pub fn index(&self) -> usize {
+        self.0.index()
+    }
+
+    pub fn generation(&self) -> u64 {
+        self.0.generation()
+    }
+}
+
+
+#[derive(Debug, Clone)]
+pub struct EntityAllocator(GenerationalIndexAllocator);
+
+impl EntityAllocator {
+    pub fn new() -> Self {
+        EntityAllocator(GenerationalIndexAllocator::new())
+    }
+
+    pub fn allocate(&mut self) -> Entity {
+        Entity(self.0.allocate())
+    }
+
+    pub fn deallocate(&mut self, entity: Entity) -> bool {
+        self.0.deallocate(entity.0)
+    }
+
+    pub fn is_live(&self, entity: Entity) -> bool {
+        self.0.is_live(entity.0)
+    }
+}