Return multiple items from a recipe in an addon (like buckets from a cake)

Multiple_Results.cpp

#include "Recipes.h"

...

/* Any existing recipes function. Try hooking ToolRecipes::addRecipes(Recipes*), etc. */
void addSomeRecipes(Recipes* recipes) {
  
  ...
  
  std::vector<Recipes::Type> ingredients;
	std::vector<std::string> shape;
	std::vector<ItemInstance> results;
	
	ingredients.push_back(Recipes::Type('U', Item::bucket, 10)); // 'U' = bucket of lava
	ingredients.push_back(Recipes::Type('/', Item::stick)); // '/' = stick
	
	results.push_back(ItemInstance(Tile::torch, 64)); // create 64 torches...
	results.push_back(ItemInstance(Item::bucket)); // ... and an empty bucket!
	
	shape.push_back("U"); // define shape
	shape.push_back("/");
  
  recipes->addShapedRecipe(results, shape, ingredients);
  
  ...
  
}

Recipes.h

#pragma once

#include <vector>
#include <string>

#include "../ItemInstance.h"

class Recipe;
class Tile;

class Recipes {
public:
	std::vector<Recipe*> recipes;
	class Type {
	public:
		Item* item;
		Tile* tile;
		ItemInstance itemInstance;
		char c;

		Type(char c, Item* item) : c(c), item(item) {}
		Type(char c, Tile* tile) : c(c), tile(tile) {}
		Type(char c, Item* item, int damage) : c(c), item(NULL), tile(NULL), itemInstance(item, 1, damage) {}
		Type(char c, Tile* tile, int damage) : c(c), item(NULL), tile(NULL), itemInstance(tile, 1, damage) {}
	};

	static Recipes* getInstance();
	void addShapedRecipe(ItemInstance const&, std::string const&, std::vector<Recipes::Type> const&);
	void addShapedRecipe(ItemInstance const&, std::string const&, std::string const&, std::vector<Recipes::Type> const&);
	void addShapedRecipe(ItemInstance const&, std::string const&, std::string const&, std::string const&, std::vector<Recipes::Type> const&);
	void addShapedRecipe(ItemInstance const&, std::vector<std::string> const&, std::vector<Recipes::Type> const&);
	
  /* ================================================================================== */
	/* This is the important function: the first argument is a vector of crafting results */
	void addShapedRecipe(std::vector<ItemInstance> const&, std::vector<std::string> const&, std::vector<Recipes::Type> const&);
  /* ================================================================================== */
  
	void addSingleIngredientRecipeItem(ItemInstance const&, ItemInstance const&);
};