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std::chrono::operator<<(std::chrono::sys_time)

From cppreference.com
< cpp‎ | chrono‎ | system clock
 
 
Date and time library
(C++11)
(C++20)
(C++11)
(C++11)
(C++11)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)(C++20)
(C++20)(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)(C++20)
(C++20)

 
 
Defined in header <chrono>
template< class CharT, class Traits, class Duration >

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

                const std::chrono::sys_time <Duration>& tp );
(1) (since C++20)
template< class CharT, class Traits, class Duration >

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

                const std::chrono::sys_days & tp );
(2) (since C++20)

Outputs tp into the stream os.

1) Equivalent to:
return os << std::format (os.getloc(), STATICALLY-WIDEN<CharT>("{:L%F %T}"), tp);

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

This overload participates in overload resolution only if std::chrono::treat_as_floating_point_v <typename Duration::rep> is false and Duration(1) < std::chrono::days (1).
2) Equivalent to os << std::chrono::year_month_day (tp);.

[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

formatting support for sys_time
(class template specialization) [edit]
(C++20)
stores formatted representation of the arguments in a new string
(function template) [edit]
(C++20)
outputs a year_month_day into a stream
(function template) [edit]

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