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

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C++
Utilities library
General utilities
Relational operators (deprecated in C++20)
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chrono I/O
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C-style date and time
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

(C++20)
stores formatted representation of the arguments in a new string
(function template)
(C++20)
formatting support for weekday
(class template specialization)
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