std::basic_string::operator basic_string_view
From cppreference.com
                    
                                        
                    < cpp | string | basic string
                    
                                                            
                    | operator std::basic_string_view<CharT, Traits>() const; | ||
Returns a std::basic_string_view, constructed as if by std::basic_string_view<CharT, Traits>(data(), size())
Parameters
(none)
Return value
A string view representing the entire contents of the string.
Exceptions
noexcept specification:  
noexcept
  Example
| This section is incomplete Reason: no example | 
See also
| constructs a  basic_string_view(public member function of std::basic_string_view) |