D17606: [WIP] Use <optional> if available.

[Tobias C. Berner]

tcberner added a comment.


  In D17606#377854 <https://phabricator.kde.org/D17606#377854>, @dvratil wrote:
  
  > I've recently run into the same problem on Akonadi on Windows, ended up allowing C++17 on Windows only and shipping a C++14-compatible implementation of C++17 optional in 3rdparty for everyone else.
  >
  >   Maybe we could just get rid of the `optional` in this agent until we can switch to C++17 proper. I hate not having it, but it's just one or two occurrences here and probably not worth the magic to satisfy all compilers.
  
  
  How about also using that 3rdparty optional here?

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  https://phabricator.kde.org/D17606

To: tcberner, #freebsd, mlaurent, dvratil
Cc: kde-pim, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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