diff --git a/src/util/iter.rs b/src/util/iter.rs
index 6fc96cf..57a4b8a 100644
--- a/src/util/iter.rs
+++ b/src/util/iter.rs
@@ -72,3 +72,30 @@ pub trait CombinationsIterator<T>: Iterator<Item = T> + Sized {
 }
 
 impl<I, T> CombinationsIterator<T> for I where I: Iterator<Item = T> {}
+
+pub struct Window<const SIZE: usize, I, T>
+where
+    I: Iterator<Item = T>,
+{
+    iter: I,
+}
+
+impl<const SIZE: usize, I, T> Window<SIZE, I, T>
+where
+    I: Iterator<Item = T>,
+{
+    pub fn new(iter: I) -> Self {
+        Self { iter }
+    }
+}
+
+impl<const SIZE: usize, I, T> Iterator for Window<SIZE, I, T>
+where
+    I: Iterator<Item = T>,
+{
+    type Item = [I::Item; SIZE];
+
+    fn next(&mut self) -> Option<Self::Item> {
+        todo!()
+    }
+}