Minor fixes

1. Improve const correctness in a few places (such as `Container::getMaxStackSize()` -> `Container::getMaxStackSize() const`)

2. Use C++11 varargs for `I18n::get`, `Entity::newDoubleList` and `Language::getElement`

Minecraft.World/ArmorSlot.cpp

@@ -12,7 +12,7 @@ ArmorSlot::ArmorSlot(int slotNum, shared_ptr<Container> container, int id, int x
 {
 }
 
-int ArmorSlot::getMaxStackSize()
+int ArmorSlot::getMaxStackSize() const
 {
 	return 1;
 }

Minecraft.World/ArmorSlot.h

@@ -16,7 +16,7 @@ public:
 	ArmorSlot(int slotNum, shared_ptr<Container> container, int id, int x, int y);
 	virtual ~ArmorSlot() {}
 
-	virtual int getMaxStackSize();
+	virtual int getMaxStackSize() const;
 	virtual bool mayPlace(shared_ptr<ItemInstance> item);
 	Icon *getNoItemIcon();
 	//virtual bool mayCombine(shared_ptr<ItemInstance> item); // 4J Added

Minecraft.World/BeaconMenu.cpp

@@ -134,7 +134,7 @@ bool BeaconMenu::PaymentSlot::mayPlace(shared_ptr<ItemInstance> item)
 	return false;
 }
 
-int BeaconMenu::PaymentSlot::getMaxStackSize()
+int BeaconMenu::PaymentSlot::getMaxStackSize() const
 {
 	return 1;
 }

Minecraft.World/BeaconMenu.h

@@ -14,7 +14,7 @@ private:
 		PaymentSlot(shared_ptr<Container> container, int slot, int x, int y);
 
 		bool mayPlace(shared_ptr<ItemInstance> item);
-		int getMaxStackSize();
+		int getMaxStackSize() const;
 	};
 
 public:

Minecraft.World/BeaconTileEntity.cpp

@@ -346,7 +346,7 @@ void BeaconTileEntity::setCustomName(const wstring &name)
 	this->name = name;
 }
 
-int BeaconTileEntity::getMaxStackSize()
+int BeaconTileEntity::getMaxStackSize() const
 {
 	return 1;
 }

Minecraft.World/BeaconTileEntity.h

@@ -64,7 +64,7 @@ public:
 	wstring getCustomName();
 	bool hasCustomName();
 	void setCustomName(const wstring &name);
-	int getMaxStackSize();
+	int getMaxStackSize() const;
 	bool stillValid(shared_ptr<Player> player);
 	void startOpen();
 	void stopOpen();

Minecraft.World/BrewingStandMenu.cpp

@@ -183,7 +183,7 @@ bool BrewingStandMenu::PotionSlot::mayPlace(shared_ptr<ItemInstance> item)
 	return mayPlaceItem(item);
 }
 
-int BrewingStandMenu::PotionSlot::getMaxStackSize()
+int BrewingStandMenu::PotionSlot::getMaxStackSize() const
 {
 	return 1;
 }
@@ -231,7 +231,7 @@ bool BrewingStandMenu::IngredientsSlot::mayCombine(shared_ptr<ItemInstance> seco
 	return false;
 }
 
-int BrewingStandMenu::IngredientsSlot::getMaxStackSize()
+int BrewingStandMenu::IngredientsSlot::getMaxStackSize() const
 {
 	return 64;
 }

Minecraft.World/BrewingStandMenu.h

@@ -47,7 +47,7 @@ private:
 		PotionSlot(shared_ptr<Player> player, shared_ptr<Container> container, int slot, int x, int y);
 
 		virtual bool mayPlace(shared_ptr<ItemInstance> item);
-		virtual int getMaxStackSize();
+		virtual int getMaxStackSize() const;
 		virtual void onTake(shared_ptr<Player> player, shared_ptr<ItemInstance> carried);
 		static bool mayPlaceItem(shared_ptr<ItemInstance> item);
 		virtual bool mayCombine(shared_ptr<ItemInstance> item); // 4J Added
@@ -59,7 +59,7 @@ private:
 		IngredientsSlot(shared_ptr<Container> container, int slot, int x, int y);
 
 		virtual bool mayPlace(shared_ptr<ItemInstance> item);
-		virtual int getMaxStackSize();
+		virtual int getMaxStackSize() const;
 		virtual bool mayCombine(shared_ptr<ItemInstance> item); // 4J Added
 	};
 };

Minecraft.World/BrewingStandTileEntity.cpp

@@ -397,7 +397,7 @@ void BrewingStandTileEntity::setItem(unsigned int slot, shared_ptr<ItemInstance>
 	}
 }
 
-int BrewingStandTileEntity::getMaxStackSize()
+int BrewingStandTileEntity::getMaxStackSize() const
 {
 	// this value is not used for the potion slots
 	return 64;

Minecraft.World/BrewingStandTileEntity.h

@@ -45,7 +45,7 @@ public:
 	virtual shared_ptr<ItemInstance> removeItem(unsigned int slot, int i);
 	virtual shared_ptr<ItemInstance> removeItemNoUpdate(int slot);
 	virtual void setItem(unsigned int slot, shared_ptr<ItemInstance> item);
-	virtual int getMaxStackSize();
+	virtual int getMaxStackSize() const;
 	virtual bool stillValid(shared_ptr<Player> player);
 	virtual void startOpen();
 	virtual void stopOpen();

Minecraft.World/ChestTileEntity.cpp

@@ -167,7 +167,7 @@ void ChestTileEntity::save(CompoundTag *base)
 	base->putBoolean(L"bonus", isBonusChest);
 }
 
-int ChestTileEntity::getMaxStackSize()
+int ChestTileEntity::getMaxStackSize() const
 {
 	return Container::LARGE_MAX_STACK_SIZE;
 }

Minecraft.World/ChestTileEntity.h

@@ -59,7 +59,7 @@ public:
 	virtual void setCustomName(const wstring &name);
 	virtual void load(CompoundTag *base);
 	virtual void save(CompoundTag *base);
-	virtual int getMaxStackSize();
+	virtual int getMaxStackSize() const;
 	virtual bool stillValid(shared_ptr<Player> player);
 	virtual void setChanged();
 	virtual void clearCache();

Minecraft.World/CompoundContainer.cpp

@@ -70,7 +70,7 @@ void CompoundContainer::setItem(unsigned int slot, shared_ptr<ItemInstance> item
 	else c1->setItem(slot, item);
 }
 
-int CompoundContainer::getMaxStackSize()
+int CompoundContainer::getMaxStackSize() const
 {
 	return c1->getMaxStackSize();
 }

Minecraft.World/CompoundContainer.h

@@ -24,7 +24,7 @@ public:
 	virtual shared_ptr<ItemInstance> removeItem(unsigned int slot, int i);
 	virtual shared_ptr<ItemInstance> removeItemNoUpdate(int slot);
 	virtual void setItem(unsigned int slot, shared_ptr<ItemInstance> item);
-	virtual int getMaxStackSize();
+	virtual int getMaxStackSize() const;
 	virtual void setChanged();
 	virtual bool stillValid(shared_ptr<Player> player);
 

Minecraft.World/Container.h

@@ -20,7 +20,7 @@ public:
 	virtual wstring getName() = 0;
 	virtual wstring getCustomName() = 0; // 4J Stu added for sending over the network
 	virtual bool hasCustomName() = 0;
-	virtual int getMaxStackSize() = 0;
+	virtual int getMaxStackSize() const = 0;
 	virtual void setChanged() = 0;
 	virtual bool stillValid(shared_ptr<Player> player) = 0;
 	virtual void startOpen() = 0;

Minecraft.World/CraftingContainer.cpp

@@ -95,7 +95,7 @@ void CraftingContainer::setItem(unsigned int slot, shared_ptr<ItemInstance> item
 	if(menu) menu->slotsChanged();
 }
 
-int CraftingContainer::getMaxStackSize()
+int CraftingContainer::getMaxStackSize() const
 {
 	return Container::LARGE_MAX_STACK_SIZE;
 }

Minecraft.World/CraftingContainer.h

@@ -24,7 +24,7 @@ public:
 	virtual shared_ptr<ItemInstance> removeItemNoUpdate(int slot);
 	virtual shared_ptr<ItemInstance> removeItem(unsigned int slot, int count);
 	virtual void setItem(unsigned int slot, shared_ptr<ItemInstance> item);
-	virtual int getMaxStackSize();
+	virtual int getMaxStackSize() const;
 	virtual void setChanged();
 	bool stillValid(shared_ptr<Player> player);
 

Minecraft.World/DispenserTileEntity.cpp

@@ -198,7 +198,7 @@ void DispenserTileEntity::save(CompoundTag *base)
 	if (hasCustomName()) base->putString(L"CustomName", name);
 }
 
-int DispenserTileEntity::getMaxStackSize() 
+int DispenserTileEntity::getMaxStackSize() const
 {
 	return Container::LARGE_MAX_STACK_SIZE;
 }

Minecraft.World/DispenserTileEntity.h

@@ -45,7 +45,7 @@ public:
 	virtual bool hasCustomName();
 	virtual void load(CompoundTag *base);
 	virtual void save(CompoundTag *base);
-	virtual int getMaxStackSize();
+	virtual int getMaxStackSize() const;
 	virtual bool stillValid(shared_ptr<Player> player);
 	virtual void setChanged();
 

Minecraft.World/EnchantmentContainer.cpp

@@ -6,7 +6,7 @@ EnchantmentContainer::EnchantmentContainer(EnchantmentMenu *menu) : SimpleContai
 {
 }
 
-int EnchantmentContainer::getMaxStackSize()
+int EnchantmentContainer::getMaxStackSize() const
 {
 	return 1;
 }

Minecraft.World/EnchantmentContainer.h

@@ -13,7 +13,7 @@ private:
 	EnchantmentMenu *m_menu;
 public:
 	EnchantmentContainer(EnchantmentMenu *menu);
-	virtual int getMaxStackSize();
+	virtual int getMaxStackSize() const;
 	virtual void setChanged();
 	virtual bool canPlaceItem(int slot, shared_ptr<ItemInstance> item);
 };

Minecraft.World/Entity.cpp

@@ -1468,25 +1468,17 @@ void Entity::onLoadedFromSave()
 
 }
 
-ListTag<DoubleTag> *Entity::newDoubleList(unsigned int number, double firstValue, ...)
+template<typename ...Args>
+ListTag<DoubleTag> *Entity::newDoubleList(unsigned int, double firstValue, Args... args)
 {
 	ListTag<DoubleTag> *res = new ListTag<DoubleTag>();
 
 	// Add the first parameter to the ListTag
 	res->add( new DoubleTag(L"", firstValue ) );
 
-	va_list vl;
-	va_start(vl,firstValue);
-
-	double val;
-
-	for (unsigned int i=1;i<number;i++)
-	{
-		val=va_arg(vl,double);
-		res->add(new DoubleTag(L"", val));
-	}
-
-	va_end(vl);
+	// use pre-C++17 fold trick (TODO: once we drop C++14 support, use C++14 fold expression)
+	using expander = int[];
+    (void)expander{0, (res->add(new DoubleTag(L"", static_cast<double>(args))), 0)...};
 
 	return res;
 }

Minecraft.World/Entity.h

@@ -304,7 +304,8 @@ public:
 	virtual void onLoadedFromSave();
 
 protected:
-	ListTag<DoubleTag> *newDoubleList(unsigned int number, double firstValue, ...);
+	template<typename ...Args>
+	ListTag<DoubleTag> *newDoubleList(unsigned int, double firstValue, Args... args);
 	ListTag<FloatTag> *newFloatList(unsigned int number, float firstValue, float secondValue);
 
 public:

Minecraft.World/FurnaceTileEntity.cpp

@@ -160,7 +160,7 @@ void FurnaceTileEntity::save(CompoundTag *base)
 }
 
 
-int FurnaceTileEntity::getMaxStackSize()
+int FurnaceTileEntity::getMaxStackSize() const
 {
 	return Container::LARGE_MAX_STACK_SIZE;
 }
@@ -250,7 +250,7 @@ void FurnaceTileEntity::tick()
 bool FurnaceTileEntity::canBurn()
 {
 	if (items[SLOT_INPUT] == NULL) return false;
-	ItemInstance *burnResult = FurnaceRecipes::getInstance()->getResult(items[SLOT_INPUT]->getItem()->id);
+	const ItemInstance *burnResult = FurnaceRecipes::getInstance()->getResult(items[SLOT_INPUT]->getItem()->id);
 	if (burnResult == NULL) return false;
 	if (items[SLOT_RESULT] == NULL) return true;
 	if (!items[SLOT_RESULT]->sameItem_not_shared(burnResult)) return false;
@@ -264,7 +264,7 @@ void FurnaceTileEntity::burn()
 {
 	if (!canBurn()) return;
 
-	ItemInstance *result = FurnaceRecipes::getInstance()->getResult(items[SLOT_INPUT]->getItem()->id);
+	const ItemInstance *result = FurnaceRecipes::getInstance()->getResult(items[SLOT_INPUT]->getItem()->id);
 	if (items[SLOT_RESULT] == NULL) items[SLOT_RESULT] = result->copy();
 	else if (items[SLOT_RESULT]->id == result->id) items[SLOT_RESULT]->count++;
 

Minecraft.World/FurnaceTileEntity.h

@@ -57,7 +57,7 @@ public:
 	virtual void setCustomName(const wstring &name);
 	virtual void load(CompoundTag *base);
 	virtual void save(CompoundTag *base);
-	virtual int getMaxStackSize();
+	virtual int getMaxStackSize() const;
 	int getBurnProgress(int max);
 	int getLitProgress(int max);
 	bool isLit();

Minecraft.World/HopperTileEntity.cpp

@@ -131,7 +131,7 @@ void HopperTileEntity::setCustomName(const wstring &name)
 	this->name = name;
 }
 
-int HopperTileEntity::getMaxStackSize()
+int HopperTileEntity::getMaxStackSize() const
 {
 	return Container::LARGE_MAX_STACK_SIZE;
 }

Minecraft.World/HopperTileEntity.h

@@ -35,7 +35,7 @@ public:
 	virtual wstring getCustomName();
 	virtual bool hasCustomName();
 	virtual void setCustomName(const wstring &name);
-	virtual int getMaxStackSize();
+	virtual int getMaxStackSize() const;
 	virtual bool stillValid(shared_ptr<Player> player);
 	virtual void startOpen();
 	virtual void stopOpen();

Minecraft.World/I18n.cpp

@@ -3,20 +3,3 @@
 #include "I18n.h"
 
 Language *I18n::lang = Language::getInstance();
-wstring I18n::get(const wstring& id, ...)
-{
-#ifdef __PSVITA__		// 4J - vita doesn't like having a reference type as the last parameter passed to va_start - we shouldn't need this method anyway
-	return L"";
-#elif _MSC_VER >= 1930	// VS2022+ also disallows va_start with reference types
-	return id;
-#else
-	va_list va;
-	va_start(va, id);
-    return I18n::get(id, va);
-#endif
-}
-
-wstring I18n::get(const wstring& id, va_list args)
-{
-	return lang->getElement(id, args);
-}

Minecraft.World/I18n.h

@@ -10,6 +10,9 @@ private:
 	static Language *lang;
 
 public:
-    static wstring get(const wstring& id, ...);
-	static wstring get(const wstring& id, va_list args);
+	template<typename ...Args>
+    static wstring get(Args... args)
+	{
+		return lang->getElement(std::forward<Args>(args)...);
+	}
 };

Minecraft.World/Inventory.cpp

@@ -592,7 +592,7 @@ bool Inventory::hasCustomName()
 	return false;
 }
 
-int Inventory::getMaxStackSize()
+int Inventory::getMaxStackSize() const
 {
 	return MAX_INVENTORY_STACK_SIZE;
 }

Minecraft.World/Inventory.h

@@ -81,7 +81,7 @@ public:
 	wstring getName();
 	wstring getCustomName();
 	bool hasCustomName();
-	int getMaxStackSize();
+	int getMaxStackSize() const;
 	bool canDestroy(Tile *tile);
 	shared_ptr<ItemInstance> getArmor(int layer);
 	int getArmorValue();

Minecraft.World/Item.cpp

@@ -668,7 +668,7 @@ shared_ptr<ItemInstance> Item::useTimeDepleted(shared_ptr<ItemInstance> itemInst
 	return itemInstance;
 }
 
-int Item::getMaxStackSize()
+int Item::getMaxStackSize() const
 {
 	return maxStackSize;
 }

Minecraft.World/Item.h

@@ -668,7 +668,7 @@ public:
 	virtual bool TestUse(shared_ptr<ItemInstance> itemInstance, Level *level, shared_ptr<Player> player);
 	virtual shared_ptr<ItemInstance> use(shared_ptr<ItemInstance> itemInstance, Level *level, shared_ptr<Player> player);
 	virtual shared_ptr<ItemInstance> useTimeDepleted(shared_ptr<ItemInstance> itemInstance, Level *level, shared_ptr<Player> player);
-	virtual int getMaxStackSize();
+	virtual int getMaxStackSize() const;
 	virtual int getLevelDataForAuxValue(int auxValue);
 	bool isStackedByData();
 

Minecraft.World/ItemInstance.cpp

@@ -169,7 +169,7 @@ void ItemInstance::load(CompoundTag *compoundTag)
 	}
 }
 
-int ItemInstance::getMaxStackSize()
+int ItemInstance::getMaxStackSize() const
 {
 	return getItem()->getMaxStackSize();
 }
@@ -393,7 +393,7 @@ bool ItemInstance::sameItemWithTags(shared_ptr<ItemInstance> b)
 }
 
 // 4J Stu - Added this for the one time when we compare with a non-shared pointer
-bool ItemInstance::sameItem_not_shared(ItemInstance *b)
+bool ItemInstance::sameItem_not_shared(const ItemInstance *b)
 {
 	return id == b->id && auxValue == b->auxValue;
 }

Minecraft.World/ItemInstance.h

@@ -82,7 +82,7 @@ public:
 	shared_ptr<ItemInstance> useTimeDepleted(Level *level, shared_ptr<Player> player);
 	CompoundTag *save(CompoundTag *compoundTag);
 	void load(CompoundTag *compoundTag);
-	int getMaxStackSize();
+	int getMaxStackSize() const;
 	bool isStackable();
 	bool isDamageableItem();
 	bool isStackedByData();
@@ -113,7 +113,7 @@ private:
 public:
 	bool sameItem(shared_ptr<ItemInstance> b);
 	bool sameItemWithTags(shared_ptr<ItemInstance> b); //4J Added
-	bool sameItem_not_shared(ItemInstance *b); // 4J Stu - Added this for the one time I need it
+	bool sameItem_not_shared(const ItemInstance *b); // 4J Stu - Added this for the one time I need it
 	virtual unsigned int getUseDescriptionId(); // 4J Added
 	virtual unsigned int getDescriptionId(int iData = -1);
 	virtual ItemInstance *setDescriptionId(unsigned int id);

Minecraft.World/Language.cpp

@@ -14,37 +14,12 @@ Language *Language::getInstance()
 	return singleton;
 }
 
-/* 4J Jev, creates 2 identical functions.
-wstring Language::getElement(const wstring& elementId)
-{
-	return elementId;
-} */
-
-wstring Language::getElement(const wstring& elementId, ...)
-{
-#ifdef __PSVITA__		// 4J - vita doesn't like having a reference type as the last parameter passed to va_start - we shouldn't need this method anyway
-	return L"";
-#elif _MSC_VER >= 1930	// VS2022+ also disallows va_start with reference types
-	return elementId;
-#else
-	va_list args;
-	va_start(args, elementId);
-	return getElement(elementId, args);
-#endif
-}
-
-wstring Language::getElement(const wstring& elementId, va_list args)
-{
-	// 4J TODO
-	return elementId;
-}
-
-wstring Language::getElementName(const wstring& elementId)
+std::wstring Language::getElementName(const std::wstring& elementId)
 {
 	return elementId;
 }
 
-wstring Language::getElementDescription(const wstring& elementId)
+std::wstring Language::getElementDescription(const std::wstring& elementId)
 {
 	return elementId;
 }

Minecraft.World/Language.h

@@ -1,5 +1,7 @@
 #pragma once
 
+#include <string>
+
 class Language
 {
 private:
@@ -7,8 +9,11 @@ private:
 public:
 	Language();
     static Language *getInstance();
-    wstring getElement(const wstring& elementId, ...);
-	wstring getElement(const wstring& elementId, va_list args);
-    wstring getElementName(const wstring& elementId);
-    wstring getElementDescription(const wstring& elementId);
+    template<typename...Args>
+    inline std::wstring getElement(const std::wstring& elementId, Args...)
+    {
+        return elementId;
+    }
+    std::wstring getElementName(const std::wstring& elementId);
+    std::wstring getElementDescription(const std::wstring& elementId);
 };

Minecraft.World/MerchantContainer.cpp

@@ -105,7 +105,7 @@ bool MerchantContainer::hasCustomName()
 	return false;
 }
 
-int MerchantContainer::getMaxStackSize()
+int MerchantContainer::getMaxStackSize() const
 {
 	return Container::LARGE_MAX_STACK_SIZE;
 }

Minecraft.World/MerchantContainer.h

@@ -33,7 +33,7 @@ public:
 	wstring getName();
 	wstring getCustomName();
 	bool hasCustomName();
-	int getMaxStackSize();
+	int getMaxStackSize() const;
 	bool stillValid(shared_ptr<Player> player);
 	void startOpen();
 	void stopOpen();

Minecraft.World/MinecartContainer.cpp

@@ -127,7 +127,7 @@ wstring MinecartContainer::getName()
 	return hasCustomName() ? getCustomName() : app.GetString(IDS_CONTAINER_MINECART);
 }
 
-int MinecartContainer::getMaxStackSize()
+int MinecartContainer::getMaxStackSize() const
 {
 	return Container::LARGE_MAX_STACK_SIZE;
 }

Minecraft.World/MinecartContainer.h

@@ -26,7 +26,7 @@ public:
 	virtual void stopOpen();
 	virtual bool canPlaceItem(int slot, shared_ptr<ItemInstance> item);
 	virtual wstring getName();
-	virtual int getMaxStackSize();
+	virtual int getMaxStackSize() const;
 	virtual void changeDimension(int i);
 	virtual void remove();
 

Minecraft.World/MinecartHopper.h

@@ -54,7 +54,7 @@ public:
 	virtual wstring getName() { return MinecartContainer::getName(); }
 	virtual wstring getCustomName() { return MinecartContainer::getCustomName(); }
 	virtual bool hasCustomName() { return MinecartContainer::hasCustomName(); }
-	virtual int getMaxStackSize() { return MinecartContainer::getMaxStackSize(); }
+	virtual int getMaxStackSize() const { return MinecartContainer::getMaxStackSize(); }
 
 	virtual void setChanged() { MinecartContainer::setChanged(); }
 	virtual bool stillValid(shared_ptr<Player> player) { return MinecartContainer::stillValid(player); }

Minecraft.World/ResultContainer.cpp

@@ -58,7 +58,7 @@ void ResultContainer::setItem(unsigned int slot, shared_ptr<ItemInstance> item)
 	items[0] = item;
 }
 
-int ResultContainer::getMaxStackSize()
+int ResultContainer::getMaxStackSize() const
 {
 	return Container::LARGE_MAX_STACK_SIZE;
 }

Minecraft.World/ResultContainer.h

@@ -19,7 +19,7 @@ public:
 	virtual shared_ptr<ItemInstance> removeItem(unsigned int slot, int count);
 	virtual shared_ptr<ItemInstance> removeItemNoUpdate(int slot);
 	virtual void setItem(unsigned int slot, shared_ptr<ItemInstance> item);
-	virtual int getMaxStackSize();
+	virtual int getMaxStackSize() const;
 	virtual void setChanged();
 	virtual bool stillValid(shared_ptr<Player> player);
 	virtual void startOpen() { } // TODO Auto-generated method stub

Minecraft.World/SimpleContainer.cpp

@@ -106,7 +106,7 @@ void SimpleContainer::setCustomName(const wstring &name)
 	this->stringName = name;
 }
 
-int SimpleContainer::getMaxStackSize()
+int SimpleContainer::getMaxStackSize() const
 {
 	return Container::LARGE_MAX_STACK_SIZE;
 }

Minecraft.World/SimpleContainer.h

@@ -28,7 +28,7 @@ public:
 	virtual wstring getCustomName();
 	virtual bool hasCustomName();
 	virtual void setCustomName(const wstring &name);
-	virtual int getMaxStackSize();
+	virtual int getMaxStackSize() const;
 	virtual void setChanged();
 	virtual bool stillValid(shared_ptr<Player> player);
 	virtual void startOpen() { } // TODO Auto-generated method stub

Minecraft.World/Slot.cpp

@@ -91,7 +91,7 @@ void Slot::setChanged()
 	container->setChanged();
 }
 
-int Slot::getMaxStackSize()
+int Slot::getMaxStackSize() const
 {
 	return container->getMaxStackSize();
 }

Minecraft.World/Slot.h

@@ -31,7 +31,7 @@ public:
 	virtual bool hasItem();
 	virtual void set(shared_ptr<ItemInstance> item);
 	virtual void setChanged();
-	virtual int getMaxStackSize();
+	virtual int getMaxStackSize() const;
 	virtual Icon *getNoItemIcon();
 	virtual shared_ptr<ItemInstance> remove(int c);
 	virtual bool isAt(shared_ptr<Container> c, int s);