tmp/tmp4ne6xs1y/{from.md → to.md}
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#### Swap <a id="expected.un.swap">[[expected.un.swap]]</a>
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``` cpp
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constexpr void swap(unexpected& other) noexcept(is_nothrow_swappable_v<E>);
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```
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*Mandates:* `is_swappable_v<E>` is `true`.
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*Effects:* Equivalent to:
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`using std::swap; swap(`*`unex`*`, other.`*`unex`*`);`
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``` cpp
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friend constexpr void swap(unexpected& x, unexpected& y) noexcept(noexcept(x.swap(y)));
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```
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*Constraints:* `is_swappable_v<E>` is `true`.
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*Effects:* Equivalent to `x.swap(y)`.
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