23 Algorithms library [algorithms]

23.6 Mutating sequence operations [alg.modifying.operations]

23.6.11 Rotate [alg.rotate]

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template<class ForwardIterator> constexpr ForwardIterator rotate(ForwardIterator first, ForwardIterator middle, ForwardIterator last); template<class ExecutionPolicy, class ForwardIterator> ForwardIterator rotate(ExecutionPolicy&& exec, ForwardIterator first, ForwardIterator middle, ForwardIterator last);
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Requires: [first, middle) and [middle, last) shall be valid ranges.
ForwardIterator shall satisfy the Cpp17ValueSwappable requirements ([swappable.requirements]).
The type of *first shall satisfy the Cpp17MoveConstructible (Table 25) and Cpp17MoveAssignable (Table 27) requirements.
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Effects: For each non-negative integer i < (last - first), places the element from the position first + i into position first + (i + (last - middle)) % (last - first).
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Returns: first + (last - middle).
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Remarks: This is a left rotate.
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Complexity: At most last - first swaps.
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template<class ForwardIterator, class OutputIterator> constexpr OutputIterator rotate_copy(ForwardIterator first, ForwardIterator middle, ForwardIterator last, OutputIterator result); template<class ExecutionPolicy, class ForwardIterator1, class ForwardIterator2> ForwardIterator2 rotate_copy(ExecutionPolicy&& exec, ForwardIterator1 first, ForwardIterator1 middle, ForwardIterator1 last, ForwardIterator2 result);
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Requires: The ranges [first, last) and [result, result + (last - first)) shall not overlap.
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Effects: Copies the range [first, last) to the range [result, result + (last - first)) such that for each non-negative integer i < (last - first) the following assignment takes place: *(result + i) = *(first + (i + (middle - first)) % (last - first)).
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Returns: result + (last - first).
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Complexity: Exactly last - first assignments.