23 Algorithms library [algorithms]

23.6 Mutating sequence operations [alg.modifying.operations]

23.6.10 Reverse [alg.reverse]

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template<class BidirectionalIterator> constexpr void reverse(BidirectionalIterator first, BidirectionalIterator last); template<class ExecutionPolicy, class BidirectionalIterator> void reverse(ExecutionPolicy&& exec, BidirectionalIterator first, BidirectionalIterator last);
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Requires: BidirectionalIterator shall satisfy the Cpp17ValueSwappable requirements ([swappable.requirements]).
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Effects: For each non-negative integer i < (last - first) / 2, applies iter_­swap to all pairs of iterators first + i, (last - i) - 1.
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Complexity: Exactly (last - first)/2 swaps.
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template<class BidirectionalIterator, class OutputIterator> constexpr OutputIterator reverse_copy(BidirectionalIterator first, BidirectionalIterator last, OutputIterator result); template<class ExecutionPolicy, class BidirectionalIterator, class ForwardIterator> ForwardIterator reverse_copy(ExecutionPolicy&& exec, BidirectionalIterator first, BidirectionalIterator last, ForwardIterator 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 every non-negative integer i < (last - first) the following assignment takes place: *(result + (last - first) - 1 - i) = *(first + i).
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Returns: result + (last - first).
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Complexity: Exactly last - first assignments.