std::chrono::operator<<(std::chrono::weekday) - cppreference.com
From cppreference.com
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(since C++20) | |
If !wd.ok(), inserts wd.c_encoding() followed by " is not a valid weekday" into os. Otherwise, forms a std::basic_string<CharT> s consisting of the abbreviated weekday name for the weekday represented by wd, determined using the locale associated with os, and inserts s into os.
Equivalent to
return os << (wd.ok() ? std::format(os.getloc(), STATICALLY_WIDEN<CharT>("{:L%a}"), wd) : std::format(os.getloc(), STATICALLY_WIDEN<CharT>("{} is not a valid weekday"), wd.c_encoding()));
where STATICALLY_WIDEN<CharT>("...") is "..." if CharT is char, and L"..." if CharT is wchar_t.
Return value
os
Example
Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
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| P2372R3 | C++20 | the given locale was used by default | L is needed to use the given locale
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