create Board and Piece types

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "othello"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "othello"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

src/main.rs

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+mod repr;
+
+fn main() {
+    println!("Hello, world!");
+}

src/repr.rs

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+#[derive(Copy, Clone)]
+pub enum Piece {
+    Black,
+    White,
+}
+
+const BOARD_SIZE: usize = 8;
+
+#[derive(Copy, Clone)]
+pub struct Board {
+    board: [[Option<Piece>; BOARD_SIZE]; BOARD_SIZE],
+}
+
+impl Board {
+    pub const fn new() -> Self {
+        Self {
+            board: [[None; BOARD_SIZE]; BOARD_SIZE],
+        }
+    }
+
+    /// Returns a mutable reference to a place on the [`Board`]
+    /// at (i, j)
+    pub const fn get_mut(&mut self, i: usize, j: usize) -> &mut Option<Piece> {
+        &mut self.board[i][j]
+    }
+
+    /// Returns a reference to a place on the [`Board`]
+    /// at (i, j)
+    pub const fn get(&self, i: usize, j: usize) -> &Option<Piece> {
+        &self.board[i][j]
+    }
+
+    /// Place a piece on the [`Board`]
+    /// Returns an error if there already exists a piece there
+    pub fn place(&mut self, i: usize, j: usize, piece: Piece) -> Result<(), String> {
+        if self.get(i, j).is_some() {
+            return Err(format!("Cannot place on ({},{}), piece exists", i, j));
+        } else {
+            *self.get_mut(i, j) = Some(piece);
+        }
+
+        Ok(())
+    }
+}