Cf email discussion on rcpp-devel in thread titled "NVCC compatibility" started by@cdeterman.

One issue, apparently found first by@jtilly and notedhere in his RcppThrust README is thatthis line need to dropconst. Can we just add a non-const version too?

(Typo fixed. Added New Year's Resolution to only copy addresses and never ever type free hand, cffortunes::fortune("dirk can type"))