Pass Mailbox instead of Game on related functions for clarity

src/board/history.rs

@@ -3,6 +3,7 @@ use crate::movegen::r#move::{Move, MoveType};
 use super::{
     board::PieceType,
     game::Game,
+    mailbox::Mailbox,
     state::{Castle, State},
 };
 
@@ -55,8 +56,8 @@ impl MoveParameters {
         let mut move_parameters = Self::new();
         move_parameters.add_move(*mv);
         move_parameters.add_irreversible_parameters(game.board.state);
-        move_parameters.add_moved_piece(game, mv);
-        move_parameters.add_captured_piece(game, mv);
+        move_parameters.add_moved_piece(&game.mailbox, mv);
+        move_parameters.add_captured_piece(&game.mailbox, mv);
         move_parameters.add_promoted_piece(mv);
 
         move_parameters
@@ -66,13 +67,13 @@ impl MoveParameters {
         self.mv = Some(mv);
     }
 
-    fn add_moved_piece(&mut self, game: &Game, mv: &Move) {
-        self.moved_piece = game.mailbox.find_piece_at(mv.src);
+    fn add_moved_piece(&mut self, mailbox: &Mailbox, mv: &Move) {
+        self.moved_piece = mailbox.find_piece_at(mv.src);
     }
 
-    fn add_captured_piece(&mut self, game: &Game, mv: &Move) {
+    fn add_captured_piece(&mut self, mailbox: &Mailbox, mv: &Move) {
         if let MoveType::Capture | MoveType::PromotionCapture(_) = mv.move_type {
-            self.captured_piece = game.mailbox.find_piece_at(mv.dst)
+            self.captured_piece = mailbox.find_piece_at(mv.dst)
         }
     }
 
@@ -91,7 +92,7 @@ impl MoveParameters {
 
 impl Default for MoveParameters {
     fn default() -> Self {
-        MoveParameters::new()
+        Self::new()
     }
 }