day7: remember to use some convenience functions from my grid

src/day7.rs

@@ -1,5 +1,5 @@
 use aoc_runner_derive::{aoc, aoc_generator};
-use grid::{AsCoord2d, Grid};
+use grid::{Coord2d, Grid};
 use itertools::Itertools;
 use std::str::FromStr;
 
@@ -8,13 +8,11 @@ fn parse(input: &str) -> Grid<u8> {
     Grid::from_str(input).unwrap()
 }
 
-fn emit_beams(grid: &mut Grid<u8>, pos: impl AsCoord2d) -> u64 {
+fn emit_beams(grid: &mut Grid<u8>, pos: Coord2d) -> u64 {
     match grid.set(&pos, b'|') {
         None | Some(b'|') => 0,
-        Some(b'.') | Some(b'S') => emit_beams(grid, (pos.x(), pos.y() + 1)),
-        Some(b'^') => {
-            1 + emit_beams(grid, (pos.x() - 1, pos.y())) + emit_beams(grid, (pos.x() + 1, pos.y()))
-        }
+        Some(b'.') | Some(b'S') => emit_beams(grid, pos + &(0, 1)),
+        Some(b'^') => 1 + emit_beams(grid, pos + &(-1, 0)) + emit_beams(grid, pos + &(1, 0)),
         _ => panic!(),
     }
 }
@@ -39,12 +37,12 @@ fn part2(input: &Grid<u8>) -> u64 {
                 None => panic!("How did we end up outside the grid?"),
                 // if our current position is a caret, add that count to our neighbours
                 Some(b'^') => {
-                    grid.set(&(x - 1, y), grid.get(&(x - 1, y)).unwrap() + n);
-                    grid.set(&(x + 1, y), grid.get(&(x + 1, y)).unwrap() + n);
+                    grid.increment(&(x - 1, y), n);
+                    grid.increment(&(x + 1, y), n);
                 }
                 // if our current position is a . add that count here
                 Some(b'.') => {
-                    grid.set(&(x, y), grid.get(&(x, y)).unwrap() + n);
+                    grid.increment(&(x, y), n);
                 }
                 _ => panic!(),
             }