src/newgrf_storage.cpp

   1 /* $Id$ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
   6  * OpenTTD 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.
   7  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
   8  */
   9
  10 /** @file newgrf_storage.cpp Functionality related to the temporary and persistent storage arrays for NewGRFs. */
  11
  12 #include "stdafx.h"
  13 #include "newgrf_storage.h"
  14 #include "core/pool_func.hpp"
  15 #include <set>
  16
  17 PersistentStoragePool _persistent_storage_pool("PersistentStorage");
  18 INSTANTIATE_POOL_METHODS(PersistentStorage)
  19
  20 /** The changed storage arrays */
  21 static std::set<BaseStorageArray*> *_changed_storage_arrays = new std::set<BaseStorageArray*>;
  22
  23 /**
  24  * Remove references to use.
  25  */
  26 BaseStorageArray::~BaseStorageArray()
  27 {
  28         _changed_storage_arrays->erase(this);
  29 }
  30
  31 /**
  32  * Add the changed storage array to the list of changed arrays.
  33  * This is done so we only have to revert/save the changed
  34  * arrays, which saves quite a few clears, etc. after callbacks.
  35  * @param storage the array that has changed
  36  */
  37 void AddChangedStorage(BaseStorageArray *storage)
  38 {
  39         _changed_storage_arrays->insert(storage);
  40 }
  41
  42 /**
  43  * Clear the changes made since the last #ClearStorageChanges.
  44  * This is done for *all* storages that have been registered to with
  45  * #AddChangedStorage since the previous #ClearStorageChanges.
  46  *
  47  * This can be done in two ways:
  48  *  - saving the changes permanently
  49  *  - reverting to the previous version
  50  * @param keep_changes do we save or revert the changes since the last #ClearChanges?
  51  */
  52 void ClearStorageChanges(bool keep_changes)
  53 {
  54         /* Loop over all changes arrays */
  55         for (std::set<BaseStorageArray*>::iterator it = _changed_storage_arrays->begin(); it != _changed_storage_arrays->end(); it++) {
  56                 (*it)->ClearChanges(keep_changes);
  57         }
  58
  59         /* And then clear that array */
  60         _changed_storage_arrays->clear();
  61 }