Inserts the (begin, end) range at the destination pointed to by dest.
The begin and end iters must point into the same sequence. It is
allowed for dest to point to a different sequence than the one pointed
into by begin and end.
If dest is NULL, the range indicated by begin and end is
removed from the sequence. If dest points to a place within
the (begin, end) range, the range does not move.
Inserts the (begin, end) range at the destination pointed to by dest. The begin and end iters must point into the same sequence. It is allowed for dest to point to a different sequence than the one pointed into by begin and end.
If dest is NULL, the range indicated by begin and end is removed from the sequence. If dest points to a place within the (begin, end) range, the range does not move.