std::chrono:: operator<< (std::chrono::weekday_indexed)

Defined in header <chrono>
template < class CharT, class Traits > std:: basic_ostream < CharT, Traits > & operator << ( std:: basic_ostream < CharT, Traits > & os, const std:: chrono :: weekday_indexed & wdi ) ;		(since C++20)

Outputs a textual representation of wdi into the stream os , as if by:

if ( wdi. index ( ) >= 1 && wdi. index ( ) <= 5 )
os << std:: format ( os. getloc ( ) , STATICALLY_WIDEN < CharT > ( "{:L}[{}]" ) ,
wdi. weekday ( ) , wdi. index ( ) ) ;
else
os << std:: format ( os. getloc ( ) , STATICALLY_WIDEN < CharT > ( "{:L}[{} is not a valid index]" ) ,
wdi. weekday ( ) , wdi. index ( ) ) ;

where STATICALLY_WIDEN < CharT > ( "..." ) is "..." if CharT is char , and L "..." if CharT is wchar_t .

Return value

os

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR	Applied to	Behavior as published	Correct behavior
P2372R3	C++20	the given locale was used by default	L is needed to use the given locale

See also

format (C++20)	stores formatted representation of the arguments in a new string (function template)
std::formatter <std::chrono::weekday> (C++20)	formatting support for weekday (class template specialization)