22 General utilities library [utilities]

22.8 Expected objects [expected]

22.8.3 Class template unexpected [expected.unexpected]

22.8.3.4 Swap [expected.un.swap]

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constexpr void swap(unexpected& other) noexcept(is_nothrow_swappable_v<E>);
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Mandates: is_swappable_v<E> is true.
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Effects: Equivalent to: using std​::​swap; swap(unex, other.unex);
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friend constexpr void swap(unexpected& x, unexpected& y) noexcept(noexcept(x.swap(y)));
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Constraints: is_swappable_v<E> is true.
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Effects: Equivalent to x.swap(y).