D19903: Fix build with msvc

[Hannah von Reth]

vonreth created this revision.
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REVISION SUMMARY
  For the decltype change see https://stackoverflow.com/a/51347067

REPOSITORY
  R159 KActivities Statistics

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D19903

AFFECTED FILES
  src/resultset.h
  src/resultset_iterator.cpp
  src/utils/lazy_val.h

To: vonreth
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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