in welcher Datenstruktur würdet ihr ein Menu ablegen?

#ifndef H_MY_MENU_20100406012317
#define H_MY_MENU_20100406012317

#include <cassert>
#include <iomanip>
#include <iostream>
#include <sstream>
#include <utility>
#include <vector>

#include <boost/function.hpp>
#include <boost/shared_ptr.hpp>

namespace my
{
	namespace detail
	{
		unsigned count_digits(unsigned int value)
		{
			if(value > 1000000000)  return 10;
			if(value > 100000000)   return 9;
			if(value > 10000000)    return 8;
			if(value > 1000000)     return 7;
			if(value > 100000)      return 6;
			if(value > 10000)       return 5;
			if(value > 1000)        return 4;
			if(value > 100)         return 3;
			if(value > 10)          return 2;
			return 1;
		}
	}

	struct menu
	{
		struct function_t
		{
			function_t()
			{}
			function_t(boost::function0<void> to_call)
			: to_call(new boost::function0<void>(to_call))
			{}

			void operator() () const
			{
				assert(to_call && "cannot dereference a nullptr");
				boost::function0<void>& x = *to_call;
				x();
			}
			friend bool operator== (function_t lhs, function_t rhs)
			{
				return lhs.to_call == rhs.to_call;
			}
		private:
			boost::shared_ptr< boost::function0<void> > to_call;
		};

		typedef std::string text_t;
		typedef std::pair<text_t, function_t> pair_t;
		typedef std::vector<pair_t> container_t;
		typedef container_t::size_type size_t;

		void add(const text_t& title, function_t function)
		{
			items.push_back( pair_t(title, function) );
		}
		void skip_nr()
		{
			items.push_back( pair_t() );
		}
		void skip_till(size_t next_number)
		{
			while(items.size() < next_number-1)
			{
				skip_nr();
			};
		}

		void print(std::ostream& stream) const
		{
			const size_t size = items.size();
			const unsigned length = detail::count_digits(size);

			size_t nr = 1;
			bool skipped_last = false;
			for(container_t::const_iterator i(items.begin()), e(items.end()); i != e; ++i, ++nr)
			{
				if(!i->first.empty())
				{
					stream << '[' << std::setw( static_cast<std::streamsize>(length) ) << nr << ']'
						<< '\t' << i->first;
					skipped_last = false;
				}
				if(!skipped_last)
				{
					stream << std::endl;
					skipped_last = true;
				}
			}

			stream << std::endl;
		}

		function_t operator() (std::istream& in, std::ostream& out)
		{
			for(;;)
			{
				size_t nr;
				in >> nr;
				--nr;

				if(nr < items.size())
				{
					pair_t& choice = items[nr];
					if(!choice.first.empty())
						return choice.second;
				}
				out << "wrong number - again" << std::endl;

				std::string rubbish;
				std::getline(in, rubbish);
				in.clear();
			}
		}

	private:
		container_t items;
	};

}

#endif //#ifndef H_MY_MENU_20100406012317

benutzung:

my::menu::function_t put_in_store        = boost::bind(hwp::source::features::put_in_store, the_user, &store_house, boost::ref(logger));
		my::menu::function_t remove_from_store   = boost::bind(hwp::source::features::remove_from_store, the_user, &store_house, boost::ref(logger));
		my::menu::function_t save_to_db          = boost::bind(hwp::source::features::save_to_db, the_user, &store_house, boost::ref(logger));
		my::menu::function_t show_store_house    = boost::bind(hwp::source::features::show_store_house, the_user, &store_house, boost::ref(logger));
		my::menu::function_t show_single_storing = boost::bind(hwp::source::features::show_single_storing, the_user, &store_house, boost::ref(logger));
		my::menu::function_t add_user            = boost::bind(hwp::source::features::add_user, the_user, boost::ref(std::cin), boost::ref(std::cout), boost::ref(logger));
		my::menu::function_t abort               = boost::bind(hwp::source::features::abort, the_user, boost::ref(logger));

		my::menu menu;
		menu.add("Waren einlagern", put_in_store);
		menu.add("Waren auslagern", remove_from_store);
		menu.add("Speichern des Lagerzustands", save_to_db);
		menu.skip_till(5);
		menu.add("Etwas ueber einen bestimmten Lagerplatz erfahren", show_store_house);
		menu.add("Einlager-Priorität eines Produktes herausfinden", show_single_storing);
		menu.skip_till(7);
		if(the_user->is_admin())
			menu.add("Nutzer hinzufügen", add_user);
		menu.skip_till(9);
		menu.add("Beenden", abort);

		menu.print(std::cout);
		my::menu::function_t to_do = menu(std::cin, std::cout);
		to_do();

		if(to_do == abort) /*beenden, vll noch mal speichern etc.*/
 /*...*/

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