[board] Add inline and const modifiers to methods on PlacedPiece

board/src/piece.rs

@@ -1,6 +1,6 @@
 // Eryn Wells <eryn@erynwells.me>
 
-use crate::Square;
+use crate::{bitboard::BitBoard, Square};
 use std::fmt;
 use std::slice::Iter;
 
@@ -169,17 +169,24 @@ pub struct PlacedPiece {
 }
 
 impl PlacedPiece {
-    pub fn new(piece: Piece, square: Square) -> PlacedPiece {
+    pub const fn new(piece: Piece, square: Square) -> PlacedPiece {
         PlacedPiece { piece, square }
     }
 
+    #[inline]
     pub fn piece(&self) -> Piece {
         self.piece
     }
 
+    #[inline]
     pub fn square(&self) -> Square {
         self.square
     }
+
+    #[inline]
+    pub(crate) fn bitboard(&self) -> BitBoard {
+        self.square.into()
+    }
 }
 
 #[cfg(test)]