simplify PosMap + BoardValueMap logic

src/repr/chains.rs

@@ -49,6 +49,20 @@ impl<T: Default> PosMap<T> {
     }
 }
 
+type PosMapOrig<T> = [[T; Board::BOARD_SIZE as usize]; Board::BOARD_SIZE as usize];
+
+impl<T: Default + Copy> From<PosMapOrig<T>> for PosMap<T> {
+    fn from(value: PosMapOrig<T>) -> Self {
+        let mut new = Self::new();
+        for i in 0..Board::BOARD_SIZE {
+            for j in 0..Board::BOARD_SIZE {
+                new.set(i, j, value[i as usize][j as usize]);
+            }
+        }
+        new
+    }
+}
+
 /// Creates a lookup map for adjacencies and chains from each position on the board
 pub fn gen_adj_lookup() -> PosMap<ChainCollection> {
     PosMap(