-#include "system/angband.h"
-
-bool item_tester_hook_activate(player_type *player_ptr, object_type *o_ptr);
-bool item_tester_hook_use(player_type *player_ptr, object_type *o_ptr);
-bool item_tester_hook_recharge(player_type *player_ptr, object_type *o_ptr);
-bool item_tester_learn_spell(player_type *player_ptr, object_type *o_ptr);
-bool item_tester_high_level_book(object_type *o_ptr);
+class ItemEntity;
+class PlayerType;
+bool item_tester_hook_use(PlayerType *player_ptr, const ItemEntity *o_ptr);
+bool item_tester_learn_spell(PlayerType *player_ptr, const ItemEntity *o_ptr);