std::basic_string_view<CharT,Traits>::swap
From cppreference.com
                    
                                        
                    < cpp | string | basic string view
                    
                                                            
                    | constexpr void swap(basic_string_view& v) noexcept; | (since C++17) | |
Exchanges the view with that of v.
Parameters
| v | - | view to swap with | 
Return value
(none)
Complexity
Constant.