Make Grid iterable

2018/15.cpp

@@ -60,11 +60,11 @@ Game::Game(Grid grid)
   , debug_out_{}
   {
     // set each unit to its initial hit points
-    grid_.each([&](auto k, auto v) {
+    for (auto [k, v] : grid_) {
       if (IsUnit(v)) {
         units_[k] = initial_hp;
       }
-    });
+    }
   }
 
 // Render the game as seen in the examples
@@ -166,9 +166,9 @@ auto Game::Simulate() -> std::optional<int> {
 
       // Detect when no targets remain for this unit and end the game
       auto game_over = true;
-      grid_.each([&](auto k, auto v) {
+      for (auto [k, v] : grid_) {
         if (IsOpposed(active_team, v)) game_over = false;
-      });
+      }
       if (game_over) {
         int total_hp = 0;
         for (auto const& [_,v] : units_) { total_hp += v; }