20 General utilities library [utilities]

20.5 Tuples [tuple]

20.5.10 Tuple specialized algorithms [tuple.special]

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template<class... Types> constexpr void swap(tuple<Types...>& x, tuple<Types...>& y) noexcept(see below);
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Constraints: is_­swappable_­v<T> is true for every type T in Types.
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Remarks: The expression inside noexcept is equivalent to: 
noexcept(x.swap(y))
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Effects: As if by x.swap(y).