gemrb/core/LRUCache.h

   1 /* GemRB - Infinity Engine Emulator
   2  * Copyright (C) 2007
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  17  *
  18  *
  19  */
  20
  21 #ifndef LRUCACHE_H
  22 #define LRUCACHE_H
  23
  24 #include "exports.h"
  25
  26 #include "Variables.h"
  27
  28 struct VarEntry;
  29
  30 class GEM_EXPORT LRUCache {
  31 public:
  32         LRUCache();
  33         ~LRUCache();
  34
  35         // set value, overwriting any previous entry
  36         void SetAt(const char* key, void* value);
  37         bool Lookup(const char* key, void*& value) const;
  38         bool Touch(const char* key);
  39         bool Remove(const char* key);
  40
  41         int GetCount() const;
  42
  43         // return n-th LRU entry. key remains owned by LRUCache.
  44         // (n = 0 is least recently used, n = 1 the next least recently used,
  45         //  etc...)
  46         bool getLRU(unsigned int n, const char*& key, void*& value) const;
  47
  48 private:
  49         // internal storage
  50         Variables v;
  51         VarEntry* head;
  52         VarEntry* tail;
  53
  54         void removeFromList(VarEntry* e);
  55 };
  56
  57
  58
  59 #endif