diff -r b043b5d5219a -r 0076bf602969 rust/hwphysics/src/data.rs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rust/hwphysics/src/data.rs	Wed Aug 07 17:28:54 2019 +0300
@@ -0,0 +1,97 @@
+use std::any::{Any, TypeId};
+
+const BLOCK_SIZE: usize = 8192;
+
+pub trait TypeTuple {
+    type Storage: Default;
+
+    fn len() -> usize;
+    fn get_types(dest: &mut Vec<TypeId>);
+}
+
+//TODO macroise this template for tuples up to sufficient size
+impl<T: 'static> TypeTuple for (T,) {
+    type Storage = (Vec<T>,);
+
+    #[inline]
+    fn len() -> usize {
+        1
+    }
+
+    #[inline]
+    fn get_types(dest: &mut Vec<TypeId>) {
+        dest.push(TypeId::of::<T>());
+    }
+}
+
+pub struct GearDataCollection<T: TypeTuple> {
+    len: usize,
+    blocks: T::Storage,
+}
+
+impl<T: TypeTuple> GearDataCollection<T> {
+    fn new() -> Self {
+        Self {
+            len: 0,
+            blocks: T::Storage::default(),
+        }
+    }
+
+    fn iter<F: Fn(T)>(&self, f: F) {}
+}
+
+pub struct GearDataGroup {
+    group_selector: u64,
+    data: Box<dyn Any + 'static>,
+}
+
+impl GearDataGroup {
+    fn iter() {}
+}
+
+pub struct GearDataManager {
+    types: Vec<TypeId>,
+    groups: Vec<GearDataGroup>,
+}
+
+impl GearDataManager {
+    pub fn new() -> Self {
+        Self {
+            types: vec![],
+            groups: vec![],
+        }
+    }
+
+    pub fn register<T: 'static>(&mut self) {
+        assert!(self.types.len() <= 64);
+        let id = TypeId::of::<T>();
+        if !self.types.contains(&id) {
+            self.types.push(id);
+        }
+    }
+
+    fn create_selector(&self, types: &[TypeId]) -> u64 {
+        let mut selector = 0u64;
+        for (i, typ) in self.types.iter().enumerate() {
+            if types.contains(&typ) {
+                selector |= 1 << (i as u64)
+            }
+        }
+        selector
+    }
+
+    pub fn iter<T: TypeTuple + 'static, F: Fn(T) + Copy>(&self, f: F) {
+        let mut types = vec![];
+        T::get_types(&mut types);
+        let selector = self.create_selector(&types);
+        for group in &self.groups {
+            if group.group_selector & selector == selector {
+                group
+                    .data
+                    .downcast_ref::<GearDataCollection<T>>()
+                    .unwrap()
+                    .iter(f);
+            }
+        }
+    }
+}