If you're returning a local variable, don't use move(). This will allow the compiler to use NRVO, and failing that, the compiler will still be allowed to perform a move (local variables become R-values within a return statement). Using move() in that context would simply inhibit NRVO and force the compiler to use a move (or a copy if move is unavailable). If you're returning something other than a local variable, NRVO isn't an option anyway and you should use move() if (and only if) you intend to pilfer the object.
