Function back

system/lib/libcxx/include/__vector/vector_bool.h:300–303

    return __make_ref(0);
  }
  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 reference back() {
    _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "vector<bool>::back() called on an empty vector");
    return __make_ref(__size_ - 1);
  }
  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 const_reference back() const {
    _LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(!empty(), "vector<bool>::back() called on an empty vector");
    return __make_ref(__size_ - 1);