rotate_copy

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##### rotate_copy

###### Prototype

    template<class ForwardRange, class OutputIterator>
    OutputIterator rotate_copy(
        const ForwardRange& rng,
        typename range_iterator<ForwardRange>::type middle,
        OutputIterator out);

###### Description

`rotate_copy` rotates the elements in a range. It copies the two ranges `[begin(rng), middle)` and `[middle, end(rng))` to `out`.

###### Definition

Defined in the header file `boost/range/algorithm/rotate_copy.hpp`

###### Requirements

- `ForwardRange` is a model of the Forward Range Concept.
- `ForwardRange` is mutable.
- `OutputIterator` is a model of the `OutputIteratorConcept`.

###### Precondition:

- `[begin(rng), middle)` is a valid range.
- `[middle, end(rng))` is a valid range.

###### Complexity

Linear. Exactly `distance(rng)` elements are copied.