#include <endian.h>
#include <vector>
#include <unordered_map>

namespace utils {

using IdType = std::size_t;

template<typename T>
class Storage {
public:
  IdType GetId(const T& value) {
    IdType id = 0;
    auto value_position = value_to_id_.find(value);

    if (value_position == value_to_id_.end()) {
      id = id_to_value_.size();
      value_to_id_[value] = id;
      id_to_value_.push_back(value);
    } else {
      id = value_position->second;
    }

    return id;
  }

  const T& GetValue(IdType id) {
    return id_to_value_[id];
  }

private:
  std::vector<T> id_to_value_;
  std::unordered_map<T, IdType> value_to_id_;
};

} // namespace utils