std::swap(std::optional)
From cppreference.com
| Defined in header <optional>
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| template< class T > void swap( optional<T>& lhs, optional<T>& rhs ) noexcept(/* see below */); |
(since C++17) | |
Overloads the std::swap algorithm for std::optional. Exchanges the state of lhs with that of rhs. Effectively calls lhs.swap(rhs).
This function template does not participate in overload resolution unless std::is_move_constructible_v<T> and std::is_swappable_v<T> are both true.
Parameters
| lhs, rhs | - | optional objects whose states to swap
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Return value
(none)
Exceptions
noexcept specification:
noexcept(noexcept(lhs.swap(rhs)))
Example
| This section is incomplete Reason: no example |
See also
| exchanges the contents (public member function) |