From 98b367d434ce290a7943434248ea2fcb5cbe9a87 Mon Sep 17 00:00:00 2001
From: Michael Neumann <mneumann@ntecs.de>
Date: Sun, 29 Nov 2015 16:24:36 +0100
Subject: [PATCH] Use more compact representation of Mark

---
 src/mark_matrix.rs | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/mark_matrix.rs b/src/mark_matrix.rs
index eeb6e95..6e372e8 100644
--- a/src/mark_matrix.rs
+++ b/src/mark_matrix.rs
@@ -1,6 +1,7 @@
 use square_matrix::SquareMatrix;
 
 #[derive(Clone, Copy, PartialEq, Eq, Debug)]
+#[repr(u8)]
 enum Mark {
     None,
     Star,
@@ -12,9 +13,6 @@ pub struct MarkMatrix {
     marks: SquareMatrix<Mark>,
 }
 
-// XXX: Use two bitmatrices. Each row has a fixed number of u64 integers. Use
-// bit-search
-
 impl MarkMatrix {
     pub fn new(n: usize) -> MarkMatrix {
         MarkMatrix {