helpers.h

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#ifndef HELPERS_H
#define HELPERS_H

#include <iostream>
#include <string>
#include <tuple>


template <typename T>
std::string to_string(T t) {
  return std::to_string(t);
}

std::string to_string(char ch) {
  return to_string(static_cast<unsigned char>(ch));
}

std::string to_string(const char *ch) {
  return std::string(ch);
}

std::string to_string(std::string const &s) {
  return s;
}

template <typename T1, typename T2>
void print_ip_tuple_impl(std::tuple<T1, T2> const &t, std::ostream &stream = std::cout) {
  static_assert(std::is_same<T1, T2>());
  stream
    << to_string(std::get<0>(t)) << '.'
    << to_string(std::get<1>(t)) << std::endl;
}

template <typename Head, typename ... Tail>
void print_ip_tuple_impl(std::tuple<Head, Tail ...> const &t, std::ostream &stream = std::cout) {
  using Second = typename std::tuple_element<0, std::tuple<Tail ...> >::type;
  static_assert(std::is_same<Head, Second>());
  stream << to_string(std::get<0>(t)) << '.';
  std::apply(
    [&stream](auto head, auto ... tail) {
      print_ip_tuple_impl(std::make_tuple(tail...), stream);
    }, t);
}


#endif