#include <iostream>

void foo(int i)
{
  std::cout << i << std::endl;
};

template<typename T, typename... Types>
void fold_f(T arg, Types... args)
{
  foo(arg);
  if constexpr (sizeof...(args) > 0)
    fold_f(args...);
}

int main()
{
  fold_f(1, 2, 7);
}