#include <cstdlib>
#include <utility>
#include <iostream>

template <size_t I>
size_t foo() { return I; }

template <class T, size_t... I>
T switch_(size_t i, std::index_sequence<I...>)
{
  T ret;
  const bool ar[] = {
    ((i == I) ? (ret = foo<I>()):false, false)... };
  return ret;
}

template <class T, size_t Max>
T do_switch(size_t i)
{
  return switch_<T>(i, std::make_index_sequence<Max>());
}

int main(int argc, char** argv)
{
  size_t ret = do_switch<size_t, 10>(argc);
  std::cout << ret << std::endl;
  return 0;
}