Method begin

ext/include/tsl/array-hash/array_hash.h:1013–1022

* Iterators */

   * Iterators
   */
  iterator begin() noexcept {
    auto begin = m_buckets_data.begin();
    while (begin != m_buckets_data.end() && begin->empty()) {
      ++begin;
    }

    return (begin != m_buckets_data.end())
               ? iterator(begin, begin->cbegin(), this)
               : end();
  }

  const_iterator begin() const noexcept { return cbegin(); }