--- a/src/group.h	Thu Aug 02 12:22:40 2007 +0000
+++ b/src/group.h	Thu Aug 02 12:51:57 2007 +0000
@@ -13,40 +13,31 @@
 	INVALID_GROUP = 0xFFFF,
 };
 
-struct Group {
+struct Group;
+DECLARE_OLD_POOL(Group, Group, 5, 2047)
+
+struct Group : PoolItem<Group, GroupID, &_Group_pool> {
 	StringID string_id;                     ///< Group Name
 
 	uint16 num_vehicle;                     ///< Number of vehicles wich belong to the group
 	PlayerID owner;                         ///< Group Owner
-	GroupID index;                          ///< Array index
 	VehicleTypeByte vehicle_type;           ///< Vehicle type of the group
 
 	bool replace_protection;                ///< If set to true, the global autoreplace have no effect on the group
 	uint16 num_engines[TOTAL_NUM_ENGINES];  ///< Caches the number of engines of each type the player owns (no need to save this)
+
+	Group(StringID str = STR_NULL);
+	virtual ~Group();
+
+	void QuickFree();
+
+	bool IsValid() const;
 };
 
-DECLARE_OLD_POOL(Group, Group, 5, 2047)
-
-
-static inline bool IsValidGroup(const Group *g)
-{
-	return g->string_id != STR_NULL;
-}
-
-static inline void DestroyGroup(Group *g)
-{
-	DeleteName(g->string_id);
-}
-
-static inline void DeleteGroup(Group *g)
-{
-	DestroyGroup(g);
-	g->string_id = STR_NULL;
-}
 
 static inline bool IsValidGroupID(GroupID index)
 {
-	return index < GetGroupPoolSize() && IsValidGroup(GetGroup(index));
+	return index < GetGroupPoolSize() && GetGroup(index)->IsValid();
 }
 
 static inline bool IsDefaultGroupID(GroupID index)
@@ -64,7 +55,7 @@
 	return id_g == ALL_GROUP;
 }
 
-#define FOR_ALL_GROUPS_FROM(g, start) for (g = GetGroup(start); g != NULL; g = (g->index + 1U < GetGroupPoolSize()) ? GetGroup(g->index + 1) : NULL) if (IsValidGroup(g))
+#define FOR_ALL_GROUPS_FROM(g, start) for (g = GetGroup(start); g != NULL; g = (g->index + 1U < GetGroupPoolSize()) ? GetGroup(g->index + 1) : NULL) if (g->IsValid())
 #define FOR_ALL_GROUPS(g) FOR_ALL_GROUPS_FROM(g, 0)
 
 /**

--- a/src/group_cmd.cpp	Thu Aug 02 12:22:40 2007 +0000
+++ b/src/group_cmd.cpp	Thu Aug 02 12:51:57 2007 +0000
@@ -19,6 +19,7 @@
 #include "window.h"
 #include "vehicle_gui.h"
 #include "strings.h"
+#include "misc/autoptr.hpp"
 
 /**
  * Update the num engines of a groupID. Decrease the old one and increase the new one
@@ -39,41 +40,34 @@
 }
 
 
-/**
- * Called if a new block is added to the group-pool
- */
-static void GroupPoolNewBlock(uint start_item)
+DEFINE_OLD_POOL_GENERIC(Group, Group)
+
+
+Group::Group(StringID str)
 {
-	/* We don't use FOR_ALL here, because FOR_ALL skips invalid items.
-	 * TODO - This is just a temporary stage, this will be removed. */
-	for (Group *g = GetGroup(start_item); g != NULL; g = (g->index + 1U < GetGroupPoolSize()) ? GetGroup(g->index + 1) : NULL) g->index = start_item++;
+	this->string_id = str;
 }
 
-DEFINE_OLD_POOL(Group, Group, GroupPoolNewBlock, NULL)
-
-static Group *AllocateGroup(void)
+Group::~Group()
 {
-	/* We don't use FOR_ALL here, because FOR_ALL skips invalid items.
-	 * TODO - This is just a temporary stage, this will be removed. */
-	for (Group *g = GetGroup(0); g != NULL; g = (g->index + 1U < GetGroupPoolSize()) ? GetGroup(g->index + 1) : NULL) {
-		if (!IsValidGroup(g)) {
-			const GroupID index = g->index;
+	this->QuickFree();
+	this->string_id = STR_NULL;
+}
 
-			memset(g, 0, sizeof(*g));
-			g->index = index;
+void Group::QuickFree()
+{
+	DeleteName(this->string_id);
+}
 
-			return g;
-		}
-	}
-
-	/* Check if we can add a block to the pool */
-	return (AddBlockToPool(&_Group_pool)) ? AllocateGroup() : NULL;
+bool Group::IsValid() const
+{
+	return this->string_id != STR_NULL;
 }
 
 void InitializeGroup(void)
 {
-	CleanPool(&_Group_pool);
-	AddBlockToPool(&_Group_pool);
+	_Group_pool.CleanPool();
+	_Group_pool.AddBlockToPool();
 }
 
 
@@ -100,16 +94,21 @@
 	VehicleType vt = (VehicleType)p1;
 	if (!IsPlayerBuildableVehicleType(vt)) return CMD_ERROR;
 
-	Group *g = AllocateGroup();
+	AutoPtrT<Group> g_auto_delete;
+
+	Group *g = new Group(STR_EMPTY);
 	if (g == NULL) return CMD_ERROR;
 
+	g_auto_delete = g;
+
 	if (flags & DC_EXEC) {
 		g->owner = _current_player;
-		g->string_id = STR_EMPTY;
 		g->replace_protection = false;
 		g->vehicle_type = vt;
 
 		InvalidateWindowData(GetWCForVT(vt), (vt << 11) | VLW_GROUP_LIST | _current_player);
+
+		g_auto_delete.Detach();
 	}
 
 	return CommandCost();
@@ -153,7 +152,7 @@
 
 		/* Delete the Replace Vehicle Windows */
 		DeleteWindowById(WC_REPLACE_VEHICLE, g->vehicle_type);
-		DeleteGroup(g);
+		delete g;
 
 		InvalidateWindowData(GetWCForVT(vt), (vt << 11) | VLW_GROUP_LIST | _current_player);
 	}
@@ -416,7 +415,7 @@
 	Group *g;
 
 	FOR_ALL_GROUPS(g) {
-		if (p->index == g->owner) DeleteGroup(g);
+		if (p->index == g->owner) delete g;
 	}
 }
 
@@ -447,11 +446,7 @@
 	int index;
 
 	while ((index = SlIterateArray()) != -1) {
-		if (!AddBlockIfNeeded(&_Group_pool, index)) {
-			error("Groups: failed loading savegame: too many groups");
-		}
-
-		Group *g = GetGroup(index);
+		Group *g = new (index) Group();
 		SlObject(g, _group_desc);
 	}
 }

--- a/src/strings.cpp	Thu Aug 02 12:22:40 2007 +0000
+++ b/src/strings.cpp	Thu Aug 02 12:51:57 2007 +0000
@@ -849,7 +849,7 @@
 				const Group *g = GetGroup(GetInt32(&argv));
 				int64 args[1];
 
-				assert(IsValidGroup(g));
+				assert(g->IsValid());
 
 				args[0] = g->index;
 				buff = GetStringWithArgs(buff, IsCustomName(g->string_id) ? g->string_id : (StringID)STR_GROUP_NAME_FORMAT, args, last);