Solve day 10

src/lib.rs

@@ -1,5 +1,6 @@
 //! This library contains useful helper functions that may be useful in several problems.
 
+use std::ops::{Add, AddAssign};
 use std::{
     fmt::{Debug, Display},
     ops::{Div, Mul, Rem},
@@ -91,3 +92,55 @@ where
     let gcd = gcd(a, b);
     a / gcd * b
 }
+
+/// Given a function and a name of a file in the `input` directory,
+/// assert that the function applied to the contents of the file returns the expected result.
+/// ```
+#[macro_export]
+macro_rules! assert_example {
+    ($solve:ident, $file:expr, $expected:expr) => {
+        assert_eq!(
+            $solve(include_str!(concat!("../../input/", $file))),
+            $expected,
+            "{}, {}",
+            stringify!($solve),
+            $file,
+        )
+    };
+}
+
+#[derive(Default, Copy, Clone, Debug, Hash, Eq, PartialEq)]
+pub struct Vec2<T> {
+    pub x: T,
+    pub y: T,
+}
+
+impl<T> Vec2<T> {
+    pub fn new(x: T, y: T) -> Self {
+        Self { x, y }
+    }
+}
+
+impl<T> Add for Vec2<T>
+where
+    T: Add<Output = T>,
+{
+    type Output = Self;
+
+    fn add(self, rhs: Self) -> Self::Output {
+        Self {
+            x: self.x + rhs.x,
+            y: self.y + rhs.y,
+        }
+    }
+}
+
+impl<T> AddAssign for Vec2<T>
+where
+    T: AddAssign,
+{
+    fn add_assign(&mut self, rhs: Self) {
+        self.x += rhs.x;
+        self.y += rhs.y;
+    }
+}