Put the ghosts in a tuple to reduce duplication

lib/Canvas.cpp

@@ -26,10 +26,9 @@ void Canvas::update(const Game & game) {
   renderSuperPellets(game.superPellets);
   renderPacMan(game.pacMan);
 
-  renderGhost(game.blinky);
-  renderGhost(game.speedy);
-  renderGhost(game.inky);
-  renderGhost(game.clyde);
+  std::apply([&](const auto&... ghost) {
+      (renderGhost(ghost),...);
+  }, game.ghosts);
 
   renderScore(game.score.points);
   renderLives(game.score.lives);

lib/Game.cpp

@@ -11,13 +11,11 @@ Game::Game()
   : pacMan(board),
     pellets(board),
     superPellets(board),
-    blinky(board),
-    speedy(board),
-    inky(board),
-    clyde(board) {
+    ghosts(Blinky(board), Speedy(board), Inky(board), Clyde(board)) {
   score.lives = DEFAULT_LIVES;
 }
 
+
 auto Game::now() {
   return std::chrono::system_clock::now();
 }
@@ -52,10 +50,9 @@ void Game::run() {
 void Game::step(std::chrono::milliseconds delta, InputState inputState) {
   pacMan.update(delta, inputState, board);
 
-  blinky.update(delta, board);
-  speedy.update(delta, board);
-  inky.update(delta, board);
-  clyde.update(delta, board);
+  std::apply([&](auto &... ghost) {
+      (ghost.update(delta, board),...);
+  }, ghosts);
 
   eatPellets();
 }

lib/Game.hpp

@@ -23,10 +23,7 @@ private:
   PacMan pacMan;
   Pellets pellets;
   SuperPellets superPellets;
-  Blinky blinky;
-  Speedy speedy;
-  Inky inky;
-  Clyde clyde;
+  std::tuple<Blinky, Speedy, Inky, Clyde> ghosts;
   Score score;
 
   void step(std::chrono::milliseconds delta, InputState inputState);