operator<< (std::experimental::basic_string_view)

From cppreference.com
template < class CharT, class Traits >

std:: basic_ostream < CharT, Traits > &
operator << ( std:: basic_ostream < CharT, Traits > & os,

std:: basic_string_view < CharT, Traits > v ) ;
(library fundamentals TS)

Equivalent to os << v. to_string ( ) .

Parameters

os - a character output stream
v - the view to be inserted

Return value

os