Basic knowledge of self and regions

src/lib.rs

@@ -1,62 +1,2 @@
-#[derive(Clone, Debug, Copy)]
-pub enum CellValue {
-    One,
-    Two,
-    Three,
-    Four,
-    Five,
-    Six,
-    Seven,
-    Eight,
-    Nine,
-}
-
-pub struct Cell {
-    value: Option<CellValue>,
-    candidates: Vec<CellValue>,
-}
-
-impl Default for Cell {
-    fn default() -> Cell {
-        Cell {
-            value: None,
-            candidates: vec![
-                CellValue::One,
-                CellValue::Two,
-                CellValue::Three,
-                CellValue::Four,
-                CellValue::Five,
-                CellValue::Six,
-                CellValue::Seven,
-                CellValue::Eight,
-                CellValue::Nine,
-            ],
-        }
-    }
-}
-
-#[derive(Default)]
-pub struct Board {
-    cells: [[Cell; 9]; 9],
-}
-
-impl Board {
-    fn value(self, x: usize, y: usize) -> Option<CellValue> {
-        self.cells[x][y].value
-    }
-}
-
-pub fn add(left: u64, right: u64) -> u64 {
-    left + right
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
-    }
-}
+pub mod cell;
+pub mod board;