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std::chrono::operator<<(std::chrono::year_month_weekday)

From cppreference.com
 
 
Utilities library
General utilities
Date and time
Function objects
Formatting library (C++20)
(C++11)
Relational operators (deprecated in C++20)
Integer comparison functions
(C++20)(C++20)(C++20)   
(C++20)
Swap and type operations
(C++14)
(C++11)

(C++11)
(C++11)
(C++17)
Common vocabulary types
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(C++17)
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(C++17)
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Elementary string conversions
(C++17)
(C++17)
 
 
 
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_weekday& ymwd );
(since C++20)

Outputs a textual representation of ymwd into os, as if by

os << std::format(os.getloc(), STATICALLY_WIDEN<CharT>("{}/{:L}/{:L}"),
                  ymwd.year(), ymwd.month(), ymwd.weekday_indexed());

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

[edit] Return value

os.

[edit] 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

[edit] See also

(C++20)
stores formatted representation of the arguments in a new string
(function template) [edit]
specialization of std::formatter that formats a year_month_day according to the provided format
(class template specialization) [edit]