tmp/tmpx_fbrms8/{from.md → to.md}
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### Specialized algorithms <a id="optional.specalg">[[optional.specalg]]</a>
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``` cpp
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template<class T>
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```
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*Constraints:* `is_move_constructible_v<T>` is `true` and
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`is_swappable_v<T>` is `true`.
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### Specialized algorithms <a id="optional.specalg">[[optional.specalg]]</a>
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``` cpp
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template<class T>
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constexpr void swap(optional<T>& x, optional<T>& y) noexcept(noexcept(x.swap(y)));
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```
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*Constraints:* `is_move_constructible_v<T>` is `true` and
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`is_swappable_v<T>` is `true`.
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