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boost::move_backward
// In header: <boost/move/algo/move.hpp> template<typename I, typename O> O move_backward(I f, I l, O result);
Effects: Moves elements in the range [first,last) into the range [result - (last-first),result) starting from last - 1 and proceeding to first. For each positive integer n <= (last - first), performs *(result - n) = boost::move(*(last - n)).
Requires: result shall not be in the range [first,last).
Returns: result - (last - first).
Complexity: Exactly last - first assignments.