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#include <functional>
#include <type_traits>
 
constexpr int ParametersCountLimit = 100;
 
template <typename Head, typename ... Tail>
struct helper
{
	using guard = typename std::enable_if<sizeof...(Tail) < ParametersCountLimit>::type;
	using next = helper<Head, Tail..., Head>;
	using fn = Head(Head, Tail...);
};
 
template <typename T, int N>
struct generator
{
	using helper_type = typename generator<T, N-1>::helper_type::next;
	using type = typename helper_type::fn;
};
 
template <typename T>
struct generator<T,2>
{
	using helper_type = helper<T, T>;
	using type = typename helper_type::fn;
};
 
template <class T>
class TD;
 
int main()
{
	TD< generator<int,99>::type > d;
	return 0;
}
 

prog.cpp: In function 'int main()':
prog.cpp:33:32: error: aggregate 'TD<int(int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int)> d' has incomplete type and cannot be defined
  TD< generator<int,99>::type > d;
                                ^

Standard output is empty