std::chrono:: operator<< (std::chrono::year_month_day)

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C++
Utilities library
General utilities
Relational operators (deprecated in C++20)
Date and time utilities
Time point
(C++11)
(C++20)
Duration
(C++11)
Clocks
(C++20)
(C++20)
(C++20)
Time of day
(C++20) (C++20)
(C++20) (C++20)
(C++20)

Calendar
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
Time zone
(C++20)
(C++20)
(C++20) (C++20) (C++20) (C++20)
(C++20)
chrono I/O
(C++20)
C-style date and time
std::chrono::year_month_day
Defined in header <chrono>
template < class CharT, class Traits >

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

const std:: chrono :: year_month_day & ymd ) ;
(since C++20)

Outputs a textual representation of ymd into the stream os . This first forms a std:: basic_string < CharT > s consisting of a textual representation of the date in the format yyyy-mm-dd (same as the one output by formatter with the %F specifier). Then, if ! ymd. ok ( ) , appends " is not a valid date" to s . Inserts s into os .

Equivalent to

return os << ( ymd. ok ( ) ?
std:: format ( STATICALLY_WIDEN < CharT > ( "{:%F}" ) , ymd ) :
std:: format ( STATICALLY_WIDEN < CharT > ( "{:%F} is not a valid date" ) , ymd ) ) ;

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

Return value

os

Example

This section is incomplete
Reason: no example

See also

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