Function ZigZagEncode

libs/base/bits.hpp:32–36

template <typename T>
std::make_unsigned_t<T> ZigZagEncode(T x)
{
  static_assert(std::is_signed<T>::value, "Type should be signed");
  return (x << 1) ^ (x >> (sizeof(x) * 8 - 1));
}

template <typename T>
std::make_signed_t<T> ZigZagDecode(T x)