1 files changed, 49 insertions, 0 deletions
diff --git a/2024_rust/src/lib.rs b/2024_rust/src/lib.rs
index f8a84d6..c034fea 100644
--- a/2024_rust/src/lib.rs
+++ b/2024_rust/src/lib.rs
@@ -1,3 +1,52 @@
+pub mod matrix {
+    pub type Pos = (usize, usize);
+
+    #[derive(Clone)]
+    pub struct Matrix<T> {
+        dots: Vec<Vec<T>>,
+        pub limit: Pos,
+    }
+
+    impl<T> Matrix<T> {
+        pub fn new<F>(text: &str, parse: F) -> Self
+        where
+            F: Fn(char) -> T,
+        {
+            let dots: Vec<Vec<T>> = text
+                .lines()
+                .map(|row| row.chars().map(|c| parse(c)).collect())
+                .collect();
+            let limit = (dots.len(), dots[0].len());
+            Self { dots, limit }
+        }
+
+        pub fn get(&self, (x, y): Pos) -> &T {
+            &self.dots[x][y]
+        }
+
+        pub fn set(&mut self, (x, y): Pos, dot: T) {
+            self.dots[x][y] = dot;
+        }
+    }
+
+    use std::fmt;
+    impl<T> fmt::Display for Matrix<T>
+    where
+        T: fmt::Display,
+    {
+        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+            for row in &self.dots {
+                write!(
+                    f,
+                    "{}\n",
+                    row.iter().map(|c| c.to_string()).collect::<String>()
+                )?;
+            }
+            fmt::Result::Ok(())
+        }
+    }
+}
+
 pub fn run_day<S1, S2>(day: &str, p1: S1, p2: S2)
 where
     S1: FnOnce(&str) -> String,