#include <map>
#include <iostream>

class Items
{
private:
    static int idCounter()
    {
        static int count = 0;
        return count++;
    }
    static std::map<int, Items *> & idItems()
    {
        static std::map<int, Items *> idItems;
        return idItems;
    }

    int id;
    std::string Name;
    int val;

    Items() {}
    Items(int id, int value, std::string name)
    {
        this->id = id;
        this->val = value;
        this->Name = name;
        idItems()[id] = this;
    }
public:
    static Items & sword()
    {
        static Items item(idCounter(), 450, "sword");
        return item;
    }
    static Items & meat()
    {
        static Items item(idCounter(), 50, "meat");
        return item;
    }
    static Items & gold()
    {
        static Items item(idCounter(), 1, "gold");
        return item;
    }

    Items(int ID)
    {
        *this = *idItems()[ID];
    }

    bool operator!=(Items & comp) const
    {
        if (id != comp.id)
            return true;
        return false;
    }

    int getID()
    {
        return id;
    }

    int value()
    {
        return val;
    }

    std::string name()
    {
        return Name;
    }
};

int main() {
    Items item = Items::gold();

    std::cout << item.name() << " (" << item.getID() << ") value: " << item.value() << "\n";
    std::cout << Items::meat().name() << " (" << Items::meat().getID() << ") value: " << Items::meat().value() << "\n";
    std::cout << Items::meat().name() << " (" << Items::meat().getID() << ") value: " << Items::meat().value() << "\n";

    item = Items(1); // OK
    std::cout << item.name() << " (" << item.getID() << ") value: " << item.value() << "\n";

    item = Items(2); // ERROR
    return 0;
}