std::chrono...eekday_last)(3)

💖 NAME 💖

Okay bestie, the name is std::chrono::operator<<(std::chrono::year_month_weekday_last) — and then the dash — and then, because the manual literally said it twice, the exact same std::chrono::operator<<(std::chrono::year_month_weekday_last) again. No cap, that's the NAME line: name, dash, name. 🫶

✨ Synopsis ✨

This page is from the C++ Standard Libary manual (yes, that spelling is the manual's, I'm just the messenger 🙈), and the page label is std::chrono...eekday_last)(3).

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_last& ymwdl );

Since C++20 ((since C++20) on the page 💅).

It outputs a textual representation of ymwdl into os, as if by:

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

Where STATICALLY_WIDEN<CharT>("{}/{:L}/{:L}") is "{}/{:L}/{:L}" if CharT is char, and L"..." if CharT is wchar_t. That's the whole translation unit of a vibe check, literally. 🦋

🎀 Return value 🎀

It returns os. That's it — os is the whole return value, and honestly? iconic. 💖

💅 Defect reports 💅

The following behavior-changing defect reports were applied retroactively to previously published C++ standards (committee time travel, but make it paperwork ✨). The columns are DR, Applied to, Behavior as published, and Correct behavior.

• P2372R3 — applied to C++20.
  • Behavior as published: the given locale was used by default
  • Correct behavior: L is needed to use the given locale

🌈 See also 🌈

• format (C++20) — stores formatted representation of the arguments in a new string (function template).
• std::formatter<std::chrono::year_month_day> (C++20) — formatting support for year_month_day (class template specialization).

Okay bestie, that's the whole page 💜. Source/URL: http://cppreference.com; version/date: 2024.06.10; page footer label: std::chrono...eekday_last)(3). Mwah 💋