1 files changed, 18 insertions, 0 deletions
diff --git a/CLI/rust/src/game_of_life/simulation/plane.rs b/CLI/rust/src/game_of_life/simulation/plane.rs
index 21c34cf..11d7ee5 100644
--- a/CLI/rust/src/game_of_life/simulation/plane.rs
+++ b/CLI/rust/src/game_of_life/simulation/plane.rs
@@ -8,6 +8,24 @@ use std::ops::{Index, IndexMut};
 #[derive(Debug, Clone, PartialEq)]
 pub(crate) struct Plane<T>(pub Vec<T>);
 
+impl<T> Plane<T> {
+    pub fn len(&self) -> isize {
+        self.0.len() as isize
+    }
+}
+
+#[cfg(test)]
+mod len {
+    use super::*;
+
+    #[test]
+    fn get_len() {
+        assert_eq!(Plane(vec![false, false, true, false, false]).len(), 5);
+        assert_eq!(Plane(vec![false, false, true, false]).len(), 4);
+        assert_eq!(Plane(vec![false, false, true]).len(), 3);
+    }
+}
+
 impl<T> Index<isize> for Plane<T> {
     type Output = T;
     fn index(&self, idx: isize) -> &T {