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

Sun Dec 30 16:36:28 GMT 2018

rakuco added a comment.

  In D17606#377854 <https://phabricator.kde.org/D17606#377854>, @dvratil wrote:

  > 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.

  Right, so would you be OK with reverting commits 39cbfe725870a94c74a9d344f81212f04aa56d30 <https://phabricator.kde.org/R206:39cbfe725870a94c74a9d344f81212f04aa56d30> and b44642b4ec9773abc299dcc0ca8d02797fa6b9a8 <https://phabricator.kde.org/R206:b44642b4ec9773abc299dcc0ca8d02797fa6b9a8>?

REPOSITORY
  R206 KMail

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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