From 556ab5669d1d87e68cbc14521e60a7673529d4ae Mon Sep 17 00:00:00 2001
From: "Timothy J. Warren" <tim@timshomepage.net>
Date: Fri, 16 Dec 2022 12:20:31 -0500
Subject: [PATCH] Quick macro to do newtype deref implementation

---
 aoc-shared/src/lib.rs | 20 ++++++++++++++++++++
 day8/src/main.rs      | 15 ++-------------
 2 files changed, 22 insertions(+), 13 deletions(-)

diff --git a/aoc-shared/src/lib.rs b/aoc-shared/src/lib.rs
index 204404f..67c5f33 100644
--- a/aoc-shared/src/lib.rs
+++ b/aoc-shared/src/lib.rs
@@ -1,2 +1,22 @@
 pub mod grid;
 pub use grid::*;
+
+#[macro_export]
+macro_rules! deref {
+    ($($struct: ty, $target: ty),* ) => {
+        $(
+            impl ::core::ops::Deref for $struct {
+                type Target = $target;
+
+                fn deref(&self) -> &Self::Target {
+                    &self.0
+                }
+            }
+            impl ::core::ops::DerefMut for $struct {
+                fn deref_mut(&mut self) -> &mut Self::Target {
+                    &mut self.0
+                }
+            }
+        )*
+    }
+}
diff --git a/day8/src/main.rs b/day8/src/main.rs
index d5058b7..c12b500 100644
--- a/day8/src/main.rs
+++ b/day8/src/main.rs
@@ -1,7 +1,7 @@
+use aoc_shared::deref;
 use aoc_shared::grid::Grid as BaseGrid;
 use aoc_shared::grid::Grid2d;
 use std::collections::HashSet;
-use std::ops::{Deref, DerefMut};
 
 #[derive(Debug, Copy, Clone, PartialOrd, PartialEq, Eq, Hash)]
 enum VisibleDirection {
@@ -53,18 +53,7 @@ impl Tree {
 // 2. Implement the Deref trait for the wrapped struct
 #[derive(Debug)]
 pub struct Grid<T>(BaseGrid<T>);
-impl<T> Deref for Grid<T> {
-    type Target = BaseGrid<T>;
-
-    fn deref(&self) -> &Self::Target {
-        &self.0
-    }
-}
-impl<T> DerefMut for Grid<T> {
-    fn deref_mut(&mut self) -> &mut Self::Target {
-        &mut self.0
-    }
-}
+deref!(Grid<Tree>, BaseGrid<Tree>);
 
 impl Grid<Tree> {
     pub fn new(width: usize) -> Self {