NAME¶

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

Synopsis¶

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

std::basic_ostream<CharT, Traits>& (since C++20)
operator<<( std::basic_ostream<CharT, Traits>& os,

const std::chrono::weekday_indexed& wdi );

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 stores formatted representation of the
(C++20) arguments in a new string
(function template)
std::formatter<std::chrono::weekday> specialization of std::formatter that formats a
(C++20) weekday according to the provided format
(class template specialization)