# std::experimental::swap(std::experimental::optional)

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< cpp‎ | experimental‎ | optional

Defined in header `<experimental/optional>` |  |
template< class T > void swap( optional<T>& lhs, optional<T>& rhs ); |  | (library fundamentals TS)

Overloads the std::swap algorithm for std::experimental::optional. Exchanges the state of `lhs` with that of `rhs`. Effectively calls lhs.swap(rhs).

### Parameters

lhs, rhs | - | `optional` objects whose states to swap

### Return value

(none)

### Exceptions

`noexcept` specification:
noexcept(lhs.swap(rhs))

### Example

| This section is incomplete Reason: no example

### See also

swap | exchanges the contents (public member function)

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