23 Algorithms library [algorithms]

23.6 Mutating sequence operations [alg.modifying.operations]

23.6.3 Swap [alg.swap]

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template<class ForwardIterator1, class ForwardIterator2> constexpr ForwardIterator2 swap_ranges(ForwardIterator1 first1, ForwardIterator1 last1, ForwardIterator2 first2); template<class ExecutionPolicy, class ForwardIterator1, class ForwardIterator2> ForwardIterator2 swap_ranges(ExecutionPolicy&& exec, ForwardIterator1 first1, ForwardIterator1 last1, ForwardIterator2 first2);
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Requires: The two ranges [first1, last1) and [first2, first2 + (last1 - first1)) shall not overlap.
*(first1 + n) shall be swappable with ([swappable.requirements]) *(first2 + n).
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Effects: For each non-negative integer n < (last1 - first1) performs: swap(*(first1 + n), ​*(first2 + n)).
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Returns: first2 + (last1 - first1).
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Complexity: Exactly last1 - first1 swaps.
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template<class ForwardIterator1, class ForwardIterator2> constexpr void iter_swap(ForwardIterator1 a, ForwardIterator2 b);
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Requires: a and b shall be dereferenceable.
*a shall be swappable with ([swappable.requirements]) *b.
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Effects: As if by swap(*a, *b).