http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24702
--- Comment #9 from Mark Phillips <pierhyth at gmail dot com> --- Thanks Jonathan for the information on the updated standard and the rationale behind restricting Koenig to actual functions and function templates. In one way it is a bit of a pity - it does make functors second-class citizens compared to functions - but the linked document explains some additional considerations, namely the risk of over-visibility of names. Perhaps it is a reasonable choice for now. Hopefully a better solution will be introduced down the track (maybe extending it to functors, while at the same time narrowing/allowing-control-over namespaces to be looked up).
