Method capacity

include/tsl/ordered_map.h:796–798

            typename std::enable_if<
                tsl::detail_ordered_hash::is_vector<U>::value>::type* = nullptr>
  size_type capacity() const noexcept {
    return m_ht.capacity();
  }

  void shrink_to_fit() { m_ht.shrink_to_fit(); }