move around

src/lib.rs

@@ -1,113 +1,16 @@
 #![feature(never_type, try_trait_v2)]
 
-mod board;
 pub mod connect4;
-mod game;
-mod perfect;
+pub mod tic_tac_toe;
+
 mod player;
 
-use std::io::Write;
-
-pub use board::Board;
-pub use perfect::PerfectPlayer;
 pub use player::{Player, State};
 
-pub trait GamePlayer: Default {
-    fn next_move(&mut self, board: &mut Board, this_player: Player);
+pub trait Game {
+    type Board;
 }
 
-#[derive(Clone, Default)]
-pub struct GreedyPlayer;
-
-impl GamePlayer for GreedyPlayer {
-    fn next_move(&mut self, board: &mut Board, this_player: Player) {
-        let first_free = board.iter().position(|p| p.is_none()).unwrap();
-        board.set(first_free, Some(this_player));
-    }
-}
-
-#[derive(Clone, Default)]
-pub struct HumanPlayer;
-
-impl GamePlayer for HumanPlayer {
-    fn next_move(&mut self, board: &mut Board, this_player: Player) {
-        loop {
-            print!("{board}where to put the next {this_player}? (0-8): ");
-
-            std::io::stdout().flush().unwrap();
-            let mut buf = String::new();
-            std::io::stdin().read_line(&mut buf).unwrap();
-
-            match buf.trim().parse() {
-                Ok(number) if number < 9 => match board.get(number) {
-                    None => {
-                        board.set(number, Some(this_player));
-                        return;
-                    }
-                    Some(_) => {
-                        println!("Field is occupied already.")
-                    }
-                },
-                Ok(_) | Err(_) => {
-                    println!("Invalid input.")
-                }
-            }
-        }
-    }
-}
-
-#[derive(Clone, Default)]
-pub struct RandomPlayer;
-
-fn fun_random() -> u64 {
-    use std::hash::{BuildHasher, Hasher};
-    std::collections::hash_map::RandomState::new()
-        .build_hasher()
-        .finish()
-}
-
-impl GamePlayer for RandomPlayer {
-    fn next_move(&mut self, board: &mut Board, this_player: Player) {
-        loop {
-            let next = (fun_random() % 9) as usize;
-            match board.get(next) {
-                Some(_) => {}
-                None => {
-                    board.set(next, Some(this_player));
-                    return;
-                }
-            }
-        }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use crate::{Board, GamePlayer, GreedyPlayer, PerfectPlayer, Player, RandomPlayer};
-
-    fn assert_win_ratio<X: GamePlayer, O: GamePlayer>(runs: u64, x_win_ratio: f64) {
-        let mut results = [0u64, 0, 0];
-
-        for _ in 0..runs {
-            let result = Board::default_play::<X, O>();
-            let idx = Player::as_u8(result);
-            results[idx as usize] += 1;
-        }
-
-        let total = results.iter().copied().sum::<u64>();
-
-        let ratio = (total as f64) / (results[0] as f64);
-        println!("{ratio} >= {x_win_ratio}");
-        assert!(ratio >= x_win_ratio);
-    }
-
-    #[test]
-    fn perfect_always_beats_greedy() {
-        assert_win_ratio::<PerfectPlayer, GreedyPlayer>(20, 1.0);
-    }
-
-    #[test]
-    fn perfect_beats_random() {
-        assert_win_ratio::<PerfectPlayer, RandomPlayer>(10, 0.95);
-    }
+pub trait GamePlayer<G: Game>: Default {
+    fn next_move(&mut self, board: &mut G::Board, this_player: Player);
 }

src/main.rs

@@ -2,7 +2,10 @@
 
 use std::time::SystemTime;
 
-use minmax::{Board, GamePlayer, GreedyPlayer, HumanPlayer, PerfectPlayer, Player, RandomPlayer};
+use minmax::{
+    tic_tac_toe::{Board, GreedyPlayer, HumanPlayer, PerfectPlayer, TicTacToe},
+    GamePlayer, Player,
+};
 
 fn main() {
     let mut results = [0, 0, 0];
@@ -25,7 +28,7 @@ fn main() {
     println!("Completed in {}ms", time.as_millis());
 }
 
-fn play_round<X: GamePlayer, O: GamePlayer>(print: bool) -> Option<Player> {
+fn play_round<X: GamePlayer<TicTacToe>, O: GamePlayer<TicTacToe>>(print: bool) -> Option<Player> {
     let mut board = Board::empty();
     let result = board.play(&mut X::default(), &mut O::default());
     if print {

src/tic_tac_toe/game.rs

@@ -1,11 +1,13 @@
-use crate::{Board, GamePlayer, Player, State};
+use crate::{GamePlayer, Player, State};
+
+use super::{board::Board, TicTacToe};
 
 impl Board {
-    pub fn default_play<X: GamePlayer, O: GamePlayer>() -> Option<Player> {
+    pub fn default_play<X: GamePlayer<TicTacToe>, O: GamePlayer<TicTacToe>>() -> Option<Player> {
         Self::empty().play(&mut X::default(), &mut O::default())
     }
 
-    pub fn play<A: GamePlayer, B: GamePlayer>(&mut self, x: &mut A, o: &mut B) -> Option<Player> {
+    pub fn play<A: GamePlayer<TicTacToe>, B: GamePlayer<TicTacToe>>(&mut self, x: &mut A, o: &mut B) -> Option<Player> {
         let mut current_player = Player::X;
 
         for _ in 0..9 {

src/tic_tac_toe/mod.rs

@@ -0,0 +1,54 @@
+use crate::Game;
+
+mod board;
+mod game;
+mod perfect;
+mod player;
+
+pub use {board::Board, perfect::PerfectPlayer, player::*};
+
+pub struct TicTacToe;
+
+impl Game for TicTacToe {
+    type Board = board::Board;
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{tic_tac_toe::board::Board, GamePlayer, Player};
+
+    use super::{
+        perfect::PerfectPlayer,
+        player::{GreedyPlayer, RandomPlayer},
+        TicTacToe,
+    };
+
+    fn assert_win_ratio<X: GamePlayer<TicTacToe>, O: GamePlayer<TicTacToe>>(
+        runs: u64,
+        x_win_ratio: f64,
+    ) {
+        let mut results = [0u64, 0, 0];
+
+        for _ in 0..runs {
+            let result = Board::default_play::<X, O>();
+            let idx = Player::as_u8(result);
+            results[idx as usize] += 1;
+        }
+
+        let total = results.iter().copied().sum::<u64>();
+
+        let ratio = (total as f64) / (results[0] as f64);
+        println!("{ratio} >= {x_win_ratio}");
+        assert!(ratio >= x_win_ratio);
+    }
+
+    #[test]
+    fn perfect_always_beats_greedy() {
+        assert_win_ratio::<PerfectPlayer, GreedyPlayer>(20, 1.0);
+    }
+
+    #[test]
+    fn perfect_beats_random() {
+        assert_win_ratio::<PerfectPlayer, RandomPlayer>(10, 0.95);
+    }
+}

src/tic_tac_toe/perfect.rs

@@ -1,6 +1,8 @@
 use std::ops::Neg;
 
-use crate::{Board, GamePlayer, Player, State};
+use crate::{GamePlayer, Player, State};
+
+use super::{board::Board, TicTacToe};
 
 #[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
 enum Score {
@@ -102,7 +104,7 @@ impl PerfectPlayer {
     }
 }
 
-impl GamePlayer for PerfectPlayer {
+impl GamePlayer<TicTacToe> for PerfectPlayer {
     fn next_move(&mut self, board: &mut Board, this_player: Player) {
         self.best_move = usize::MAX;
         self.minmax(board, this_player, 0);

src/tic_tac_toe/player.rs

@@ -0,0 +1,70 @@
+use std::io::Write;
+
+use crate::{GamePlayer, Player};
+
+use super::{board::Board, TicTacToe};
+
+#[derive(Clone, Default)]
+pub struct GreedyPlayer;
+
+impl GamePlayer<TicTacToe> for GreedyPlayer {
+    fn next_move(&mut self, board: &mut Board, this_player: Player) {
+        let first_free = board.iter().position(|p| p.is_none()).unwrap();
+        board.set(first_free, Some(this_player));
+    }
+}
+
+#[derive(Clone, Default)]
+pub struct HumanPlayer;
+
+impl GamePlayer<TicTacToe> for HumanPlayer {
+    fn next_move(&mut self, board: &mut Board, this_player: Player) {
+        loop {
+            print!("{board}where to put the next {this_player}? (0-8): ");
+
+            std::io::stdout().flush().unwrap();
+            let mut buf = String::new();
+            std::io::stdin().read_line(&mut buf).unwrap();
+
+            match buf.trim().parse() {
+                Ok(number) if number < 9 => match board.get(number) {
+                    None => {
+                        board.set(number, Some(this_player));
+                        return;
+                    }
+                    Some(_) => {
+                        println!("Field is occupied already.")
+                    }
+                },
+                Ok(_) | Err(_) => {
+                    println!("Invalid input.")
+                }
+            }
+        }
+    }
+}
+
+#[derive(Clone, Default)]
+pub struct RandomPlayer;
+
+fn fun_random() -> u64 {
+    use std::hash::{BuildHasher, Hasher};
+    std::collections::hash_map::RandomState::new()
+        .build_hasher()
+        .finish()
+}
+
+impl GamePlayer<TicTacToe> for RandomPlayer {
+    fn next_move(&mut self, board: &mut Board, this_player: Player) {
+        loop {
+            let next = (fun_random() % 9) as usize;
+            match board.get(next) {
+                Some(_) => {}
+                None => {
+                    board.set(next, Some(this_player));
+                    return;
+                }
+            }
+        }
+    }
+}