project-swan/libswan/include/swan/traits/InventoryTrait.h

#pragma once

#include <vector>
#include <stdlib.h>

#include "../common.h"
#include "../ItemStack.h"

namespace Swan {

struct InventoryTrait {
	struct Tag {};

	struct Inventory {
		virtual ~Inventory() = default;

		virtual int size() = 0;
		virtual ItemStack get(int slot) = 0;
		virtual ItemStack set(int slot, ItemStack stack) = 0;
		virtual ItemStack insert(int slot, ItemStack stack) = 0;

		ItemStack insert(ItemStack stack) { return insert(0, stack); }
	};

	virtual ~InventoryTrait() = default;

	virtual Inventory &get(Tag) = 0;
};

struct BasicInventory final: InventoryTrait::Inventory {
	BasicInventory(int size): content(size) {}

	std::vector<ItemStack> content;

	int size() override { return content.size(); }
	ItemStack get(int slot) override;
	ItemStack set(int slot, ItemStack stack) override;
	ItemStack insert(int slot, ItemStack stack) override;
};

}