22 General utilities library [utilities]

22.4 Tuples [tuple]

22.4.4 Class template tuple [tuple.tuple]

22.4.4.3 swap [tuple.swap]

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constexpr void swap(tuple& rhs) noexcept(see below); constexpr void swap(const tuple& rhs) const noexcept(see below);
1
#
Let i be in the range [0, sizeof...(Types)) in order.
2
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Mandates:
  • (2.1)
    For the first overload, (is_swappable_v<Types> && ...) is true.
  • (2.2)
    For the second overload, (is_swappable_v<const Types> && ...) is true.
3
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Preconditions: For all i, get<i>(*this) is swappable with ([swappable.requirements]) get<i>(rhs).
4
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Effects: For each i, calls swap for get<i>(*this) with get<i>(rhs).
5
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Throws: Nothing unless one of the element-wise swap calls throws an exception.
6
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Remarks: The exception specification is equivalent to
  • (6.1)
    (is_nothrow_swappable_v<Types> && ...) for the first overload and
  • (6.2)
    (is_nothrow_swappable_v<const Types> && ...) for the second overload.