Day 16

src/util/maps.rs

@@ -2,7 +2,7 @@ use std::fmt::Display;
 
 use itertools::Itertools;
 
-#[derive(Copy, Clone, PartialEq, Eq, Debug)]
+#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
 pub enum Direction {
     North,
     South,
@@ -27,6 +27,24 @@ impl Direction {
     pub fn is_parallel(self, other: Self) -> bool {
         self == other || self == other.opposite()
     }
+
+    pub fn clockwise(self) -> Self {
+        match self {
+            Self::North => Self::East,
+            Self::East => Self::South,
+            Self::South => Self::West,
+            Self::West => Self::North,
+        }
+    }
+
+    pub fn counterclockwise(self) -> Self {
+        match self {
+            Self::North => Self::West,
+            Self::West => Self::South,
+            Self::South => Self::East,
+            Self::East => Self::North,
+        }
+    }
 }
 
 #[derive(Clone)]
@@ -134,6 +152,11 @@ where
     pub fn enumerate(&self) -> impl Iterator<Item = (usize, usize, &T)> {
         self.coordinates().map(|(x, y)| (x, y, &self.map[y][x]))
     }
+
+    pub fn map<U: Copy, F: Fn(&T) -> U>(&self, f: F) -> Map<U> {
+        let v = self.map.iter().map(|row| row.iter().map(|e| f(e)).collect()).collect();
+        Map::<U>::from_2d_vec(v)
+    }
 }
 
 impl<T> Display for Map<T>