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

[Tobias C. Berner]

tcberner abandoned this revision.
tcberner added a comment.


  Thanks :)

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REVISION DETAIL
  https://phabricator.kde.org/D17606

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