D19903: Fix build with msvc

[Hannah von Reth]

vonreth added inline comments.

INLINE COMMENTS

> lazy_val.h:41
>  public:
> -    operator decltype(_f()) () const
> +    operator auto() const -> decltype(_f())
>      {

Hm recently found out that this code doesn't compile with gcc.....

REPOSITORY
  R159 KActivities Statistics

BRANCH
  master

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

To: vonreth, mlaurent, davidedmundson, aacid
Cc: kde-frameworks-devel, LeGast00n, michaelh, ngraham, bruns
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