19 General utilities library [utilities]

19.5 Tuples [tuple]

19.5.3 Class template tuple [tuple.tuple]

19.5.3.10 Tuple specialized algorithms [tuple.special]

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template<class... Types> void swap(tuple<Types...>& x, tuple<Types...>& y) noexcept(see below);
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Remarks: This function shall not participate in overload resolution unless is_­swappable_­v<T> is true for all i, where .
The expression inside noexcept is equivalent to:
noexcept(x.swap(y))
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Effects: As if by x.swap(y).