> On Dec 29, 2020, at 10:33 PM, Hao Sun
> wrote:
>
>> _Mailing list message from [Kim Barrett](mailto:kim.barr...@oracle.com) on
>> [build-dev](mailto:build-dev@openjdk.java.net):_
>>
>>
>> C++17 "guaranteed copy elision" is implemented in gcc7.
>> http://www.open-std.org/jtc1/sc22/wg21/docs/
> On Dec 24, 2020, at 3:44 PM, Xin Liu wrote:
>
> On Thu, 24 Dec 2020 17:27:39 GMT, Kim Barrett wrote:
>> […]
>> Since DUIterator_Last is just delegating both the copy constructor and
>> assignment operator to the base class, their copy constructor and
>> assignment operator would be better as t