initial bit board storage

src/bitboard.rs

@@ -0,0 +1,44 @@
+use crate::board::BOARD_SIZE;
+
+/// 8x8
+/// TODO! look into variable length bit arrays in rust
+#[derive(Copy, Clone, PartialEq, Eq)]
+pub struct BitBoard(u64);
+
+impl BitBoard {
+    pub const fn new() -> Self {
+        BitBoard(0)
+    }
+
+    pub const fn get(&self, row: usize, col: usize) -> bool {
+        ((self.0 >> (row * BOARD_SIZE + col)) & 1) != 0
+    }
+
+    pub const fn set(&mut self, row: usize, col: usize, value: bool) {
+        let index = row * BOARD_SIZE + col;
+        if value {
+            self.0 |= 1 << index; // Set the bit at (row, col) to 1
+        } else {
+            self.0 &= !(1 << index); // Clear the bit at (row, col)
+        }
+    }
+
+    pub const fn count(&self) -> u32 {
+        self.0.count_ones()
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn set_and_get() {
+        let mut b = BitBoard::new();
+        assert!(!b.get(2, 4));
+        b.set(2, 4, true);
+        assert!(b.get(2, 4));
+        b.set(2, 4, false);
+        assert!(!b.get(2, 4));
+    }
+}