more things

.gitignore

@@ -1 +1,2 @@
 /target
+perf.*

src/main.rs

@@ -61,6 +61,8 @@ struct Args {
     x: PlayerConfig,
     #[arg(short)]
     o: PlayerConfig,
+    #[arg(long)]
+    no_print_time: bool,
 }
 
 fn main() {
@@ -72,7 +74,7 @@ fn main() {
                 match player {
                     PlayerConfig::Human => Box::new(connect4::HumanPlayer),
                     PlayerConfig::Perfect { depth } => {
-                        Box::new(PerfectPlayer::new().with_max_depth(depth))
+                        Box::new(PerfectPlayer::new(!args.no_print_time).with_max_depth(depth))
                     }
                 }
             };
@@ -87,7 +89,7 @@ fn main() {
                 match player {
                     PlayerConfig::Human => Box::new(tic_tac_toe::HumanPlayer),
                     PlayerConfig::Perfect { depth } => {
-                        Box::new(PerfectPlayer::new().with_max_depth(depth))
+                        Box::new(PerfectPlayer::new(!args.no_print_time).with_max_depth(depth))
                     }
                 }
             };

src/minmax.rs

@@ -1,22 +1,26 @@
+use std::time::Instant;
+
 use crate::{Game, GamePlayer, Player, Score, State};
 
 #[derive(Clone)]
 pub struct PerfectPlayer<G: Game> {
     best_move: Option<G::Move>,
     max_depth: Option<usize>,
+    print_time: bool,
 }
 
 impl<G: Game> Default for PerfectPlayer<G> {
     fn default() -> Self {
-        Self::new()
+        Self::new(true)
     }
 }
 
 impl<G: Game> PerfectPlayer<G> {
-    pub fn new() -> Self {
+    pub fn new(print_time: bool) -> Self {
         Self {
             best_move: None,
             max_depth: G::REASONABLE_SEARCH_DEPTH,
+            print_time,
         }
     }
 
@@ -64,11 +68,15 @@ impl<G: Game> PerfectPlayer<G> {
 
 impl<G: Game> GamePlayer<G> for PerfectPlayer<G> {
     fn next_move(&mut self, board: &mut G, this_player: Player) {
-        println!("{board}");
+        let start = Instant::now();
-
         self.best_move = None;
         self.minmax(board, this_player, 0);
 
         board.make_move(self.best_move.expect("could not make move"), this_player);
+
+        if self.print_time {
+            let duration = start.elapsed();
+            println!("Move took {duration:?}");
+        }
     }
 }

src/tic_tac_toe/mod.rs

@@ -33,11 +33,11 @@ mod tests {
 
     #[test]
     fn perfect_always_beats_greedy() {
-        assert_win_ratio(20, 1.0, || PerfectPlayer::new(), || GreedyPlayer);
+        assert_win_ratio(20, 1.0, || PerfectPlayer::new(false), || GreedyPlayer);
     }
 
     #[test]
     fn perfect_beats_random() {
-        assert_win_ratio(10, 0.95, || PerfectPlayer::new(), || RandomPlayer);
+        assert_win_ratio(10, 0.95, || PerfectPlayer::new(false), || RandomPlayer);
     }
 }