void SetFree() { effects_.set(kFree); }
  void SetRead() { effects_.set(kRead); }
  void SetWrite() { effects_.set(kWrite); }
  void SetUnknownEffect() { effects_.set(); }
  void SetResourceId(ResourceId resource_id) { resource_id_ = resource_id; }
  void AddEffects(const SideEffects& other_effects) {
    effects_ |= other_effects.effects_;
  }

 private:
  std::bitset<4> effects_ = 0;