Add color and piece enums

goldchess/src/color.rs

@@ -0,0 +1,21 @@
+/// Represents the color of a piece, or the side to move.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Color {
+    White,
+    Black,
+}
+
+impl Color {
+    pub const ALL: [Color; 2] = [Color::White, Color::Black];
+}
+
+impl std::ops::Not for Color {
+    type Output = Self;
+
+    fn not(self) -> Self {
+        match self {
+            Color::White => Color::Black,
+            Color::Black => Color::White,
+        }
+    }
+}

goldchess/src/piece.rs

@@ -0,0 +1,21 @@
+/// Representation of a chess piece.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Piece {
+    Pawn,
+    Knight,
+    Bishop,
+    Rook,
+    Queen,
+    King,
+}
+
+impl Piece {
+    pub const ALL: [Piece; 6] = [
+        Piece::Pawn,
+        Piece::Knight,
+        Piece::Bishop,
+        Piece::Rook,
+        Piece::Queen,
+        Piece::King,
+    ];
+}