fix(Core/Grids): Grid improvements (#20955)

src/server/game/Grids/GridObjectLoader.h

@@ -0,0 +1,59 @@
+/*
+ * This file is part of the AzerothCore Project. See AUTHORS file for Copyright information
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Affero General Public License as published by the
+ * Free Software Foundation; either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ACORE_GRID_OBJECT_LOADER_H
+#define ACORE_GRID_OBJECT_LOADER_H
+
+#include "Cell.h"
+#include "Define.h"
+#include "GridDefines.h"
+#include "ObjectMgr.h"
+
+class GridObjectLoader
+{
+public:
+    GridObjectLoader(MapGridType& grid, Map* map)
+        : _grid(grid), _map(map) { }
+
+    void LoadAllCellsInGrid();
+
+private:
+    template<class T>
+    void AddObjectHelper(Map* map, T* obj);
+
+    void LoadCreatures(CellGuidSet const& guid_set, Map* map);
+    void LoadGameObjects(CellGuidSet const& guid_set, Map* map);
+
+    MapGridType& _grid;
+    Map* _map;
+};
+
+// Clean up and remove from world
+class GridObjectCleaner
+{
+public:
+    template<class T> void Visit(GridRefMgr<T>&);
+};
+
+// Delete objects before deleting NGrid
+class GridObjectUnloader
+{
+public:
+    void Visit(CorpseMapType&) { }    // corpses are deleted with Map
+    template<class T> void Visit(GridRefMgr<T>& m);
+};
+#endif