#include <boost/preprocessor/repetition/repeat.hpp>

#define DECL(z, n, data) \
namespace detail\
{\
	template<typename T, typename ...U>\
	struct back_t##data##_##n\
	{\
		typedef typename back_t##data##_##n<U...>::type type;\
	};\
\
	template<typename T>\
	struct back_t##data##_##n<T>\
	{\
		typedef T type;\
	};\
}\
\
template<typename T>\
T back##data##_##n(T && t)\
{\
	return t;\
}\
\
template<typename T, typename ...U>\
typename detail::back_t##data##_##n<U...>::type back##data##_##n(T && t, U &&... u)\
{\
	return ::back##data##_##n(static_cast<U &&>(u)...);\
}\

#define INNER(z, n, data) BOOST_PP_REPEAT(z, DECL, n)
BOOST_PP_REPEAT(256, INNER, "dontcare")

int main()
{
#define USE(z, n, data) int i##data##_##n = ::back##data##_##n(1,2,3);
#define INNER_USE(z, n, data) BOOST_PP_REPEAT(z, USE, n)
BOOST_PP_REPEAT(256, INNER_USE, "dontcare")
}