From 4fd8e47737e82817d652d86b306400da663f7a98 Mon Sep 17 00:00:00 2001
From: Héctor Ramón Jiménez <hector0193@gmail.com>
Date: Sat, 2 May 2020 03:31:31 +0200
Subject: Use `rustc_hash` for hashing in `game_of_life`

This seems to produce a 2x speedup.
---
 examples/game_of_life/Cargo.toml  | 1 +
 examples/game_of_life/src/main.rs | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

(limited to 'examples')

diff --git a/examples/game_of_life/Cargo.toml b/examples/game_of_life/Cargo.toml
index b1054537..2b945c4c 100644
--- a/examples/game_of_life/Cargo.toml
+++ b/examples/game_of_life/Cargo.toml
@@ -8,3 +8,4 @@ publish = false
 [dependencies]
 iced = { path = "../..", features = ["canvas", "tokio", "debug"] }
 itertools = "0.9"
+rustc-hash = "1.1"
diff --git a/examples/game_of_life/src/main.rs b/examples/game_of_life/src/main.rs
index 17b4090d..fb4b5b75 100644
--- a/examples/game_of_life/src/main.rs
+++ b/examples/game_of_life/src/main.rs
@@ -159,7 +159,7 @@ mod grid {
         canvas::{self, Cache, Canvas, Cursor, Event, Frame, Geometry, Path},
         mouse, Color, Element, Length, Point, Rectangle, Size, Vector,
     };
-    use std::collections::{HashMap, HashSet};
+    use rustc_hash::{FxHashMap, FxHashSet};
 
     pub struct Grid {
         life: Life,
@@ -395,12 +395,12 @@ mod grid {
 
     #[derive(Default)]
     pub struct Life {
-        cells: HashSet<Cell>,
+        cells: FxHashSet<Cell>,
     }
 
     impl Life {
         fn tick(&mut self) {
-            let mut adjacent_life = HashMap::new();
+            let mut adjacent_life = FxHashMap::default();
 
             for cell in &self.cells {
                 let _ = adjacent_life.entry(*cell).or_insert(0);
-- 
cgit