std::experimental::swap(std::experimental::optional)
From cppreference.com
                    
                                        
                    < 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).
Contents | 
[edit] Parameters
| lhs, rhs | - |   optional objects whose states to swap
 | 
[edit] Return value
(none)
[edit] Exceptions
noexcept specification:  
noexcept(lhs.swap(rhs))
[edit] Example
| This section is incomplete Reason: no example  | 
[edit] See also
|    exchanges the contents  (public member function)  |