std::chrono...eekday_last(3)

✨ std::chrono::year_month_weekday_last ✨

Okay so bestie, let me introduce you to std::chrono::year_month_weekday_last — the C++ Standard Library's way of saying "the last weekday of a specific year and month" and honestly? It's iconic. 💅

This whole thing lives in the <chrono> header, and it's been serving main character energy since C++20. 🌟

class year_month_weekday_last;  (since C++20)

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🦋 SYNOPSIS 🦋

So picture this: the class year_month_weekday_last represents the last weekday of a specific year and month. That's it. That's the vibe. 🎀

It's a field-based time point with a resolution of std::chrono::days, except — and this is the key part — it's literally locked to the last weekday of a year and month. Like, it can't be anything else. Boundaries, bestie. 💀

The good news? std::chrono::years- and std::chrono::months-oriented arithmetic are supported directly. No extra steps, no cap. 🔥

Also there's an implicit conversion to std::chrono::sys_days that lets you do std::chrono::days-oriented arithmetic efficiently. It's giving seamless integration, fr fr. ✨

And one more thing — year_month_weekday_last is a TriviallyCopyable StandardLayoutType. Which basically means it's the low-maintenance friend who just works. No drama. 🫶

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💜 MEMBER FUNCTIONS 💜

Okay so these are the methods it brings to the group chat:

• constructor — constructs a year_month_weekday_last (public member function)
• operator+= — modifies the time point by some number of months or years
• operator-= — (public member function) same energy, but subtracting
• year — accesses the fields of this object
• month — literally accessing the month field, (public member function)
• weekday — the weekday field, (public member function)
• weekday_last — the weekday_last field, (public member function)
• operator sys_days — converts to a std::chrono::time_point
• operator local_days — (public member function) converts to local days
• ok — checks whether this object represents a valid date (public member function). Like a vibe check for your date. 💅

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🌈 NONMEMBER FUNCTIONS 🌈

These are the outside friends who still show up for you:

• operator== — compares two year_month_weekday_last values (C++20) (function)
• operator+ — adds or subtracts a year_month_weekday_last and some number of years or months
• operator- — (C++20) (function) same thing but the other direction
• operator<< — outputs a year_month_weekday_last into a stream (C++20) (function template). Great for when you need to print it and show everyone. 🖨️✨

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🌸 HELPER CLASSES 🌸

The support squad that makes everything work behind the scenes:

• std::formatter<std::chrono::year_month_weekday_last> — formatting support for year_month_weekday_last (C++20) (class template specialization). You love to see it. 🎀
• std::hash<std::chrono::year_month_weekday_last> — hash support for std::chrono::year_month_weekday_last (C++26) (class template specialization). Future vibes only. 🦋

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💖 Pro tip from your bestie: this class is field-based, meaning it stores year, month, and weekday_last as separate fields — not as a single count since some epoch. That's the whole point and it's lowkey genius.

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Okay that's the whole page, bestie. You're now officially caught up on std::chrono::year_month_weekday_last. Go forth and compute the last weekday of any month with confidence. 👑

Kisses and chrono arithmetic, Your C++ bestie 💋

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Source: cppreference.com — dated 2024.06.10 — and this page was literally called std::chrono...eekday_last(3) because even manpage titles get abbreviated. Iconic. 🌟