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template<class BidirectionalRange, class BidirectionalOutputIterator> BidirectionalOutputIterator copy_backward(const BidirectionalRange& source_rng, BidirectionalOutputIterator out_it);
            copy_backward copies
            all elements from source_rng
            to the range [out_it
            - distance(source_rng), out_it).
          
            The values are copied in reverse order. The return value is out_it -
            distance(source_rng).
          
            Note well that unlike all other standard algorithms out_it
            denotes the end of the output sequence.
          
            Defined in the header file boost/range/algorithm/copy_backward.hpp
          
BidirectionalRange
                is a model of Bidirectional
                Range Concept.
              OutputIterator is
                a model of the OutputIteratorConcept.
              value_type of
                Bidirectional
                Range Concept is convertible to a type in OutputIterator's
                set of value types.
              out_it is not an
                iterator within the source_rng.
              [out_it, out_it
                + distance(source_rng)) is a valid range.
              
            Linear. Exactly distance(source_rng) assignments are performed.