simplify PosMap + BoardValueMap logic

src/logic/board_value.rs

@@ -20,7 +20,6 @@ impl BoardValueMap {
 
     /// Weights from: https://repub.eur.nl/pub/7142/ei2005-47.pdf
     pub fn new() -> Self {
-        let mut map = PosMap::new();
         assert_eq!(
             Board::BOARD_SIZE,
             8,
@@ -37,11 +36,6 @@ impl BoardValueMap {
             [-20, -50, -2, -2, -2, -2, -50, -20],
             [100, -20, 10, 5, 5, 10, -20, 100],
         ];
-
-        for (i, j) in Board::all_positions() {
-            map.set(i, j, POSITION_VALUES[i as usize][j as usize])
-        }
-
-        Self(map)
+        Self(PosMap::from(POSITION_VALUES))
     }
 }

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(