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