[tuple.special]

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template<class. Types>
  constexpr void swap(tuple<Types..>& x, tuple<Types..>& y) noexcept(see below);
template<class. Types>
  constexpr void swap(const tuple<Types..>& x, const tuple<Types..>& y) noexcept(see below);

Constraints:

(1.1)
For the first overload, (is_swappable_v<Types> && ..) is true.
(1.2)
For the second overload, (is_swappable_v<const Types> && ..) is true.

Remarks: The exception specification is equivalent to: noexcept(x.swap(y))

22 General utilities library [utilities]

22.4 Tuples [tuple]

22.4.12 Tuple specialized algorithms [tuple.special]