Crate open_ttt_lib[][src]

Expand description


Tic Tac Toe is a game of strategy where two players, X and O, take turns placing their mark in a 3 x 3 gird. The first player to get three marks in a row, column, or diagonal wins the game. The game can also end in a draw, known as a cat’s game.

This library contains logic to enforce the rules of Tic Tac Toe, manage the game’s state, and provides artificial intelligence algorithms for single player games.


The Game structure is the central type provided by this crate. It enforces the rules and manages the State of the game. The Opponent structure provides support for single player games.


use open_ttt_lib::{ai, board, game};

fn main() -> Result<(), Box<game::Error>> {
    // Create a game struct to manage the game.
    let mut game = game::Game::new();

    // Pick a position to place a mark. Positions are zero based.
    // An error result is returned if the position is outside the bounds
    // of the board, the position is already owned, or the game is over.
    let position = board::Position { row: 0, column: 2 };

    // do_move() updates the game state. The state indicates the player
    // who gets to place to next mark or, if the game is over, the
    // outcome of the game.
    match game.state() {
        game::State::PlayerXMove => println!("X's turn."),
        game::State::PlayerOMove => println!("O's turn."),
        game::State::PlayerXWin(_) => println!("Game Over: X wins!"),
        game::State::PlayerOWin(_) => println!("Game Over: O wins!"),
        game::State::CatsGame => println!("Game Over: cat's game."),

    // Have an AI opponent pick a move.
    let opponent = ai::Opponent::new(ai::Difficulty::Medium);
    if let Some(ai_position) = opponent.get_move(&game) {




Provides functionality for creating single player games.


Represents a game board providing multiple ways to access individual squares.


Provides game logic and state management.