poboiko added a comment.
I thought about it myself. I googled it a bit (i.e. here <https://stackoverflow.com/questions/14677997/stdfunction-vs-template>) and saw that there might be some quite unwanted runtime overhead because of using `std::function`. It might be negligible (since we're doing some costly DB operations inside anyways), but I'd prefer if we did some profiling to make sure it's OK. REPOSITORY R293 Baloo REVISION DETAIL https://phabricator.kde.org/D21703 To: bruns, #baloo, ngraham, astippich, poboiko Cc: kde-frameworks-devel, LeGast00n, domson, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
