26 Jul
2017
26 Jul
'17
11:41 a.m.
On 25. Jul 2017, at 15:46, Sergey Mitsyn via Boost <boost@lists.boost.org> wrote:
FYI there was a proposal recently for optional with the same purpose; unfortunately, it went nowhere:
There was also boost::markable with a similar intend: https://lists.boost.org/Archives/boost/2016/09/230811.php