std::chrono...ay_last::ok(3)

💅 std::chrono::year_month_weekday_last::ok

okay so bestie, welcome to the std::chrono...ay_last::ok(3) page — that's the C++ Standard Library manual, and today's main character is a little member function that just wants to know if your date is valid 🎀

✨ NAME ✨

std::chrono::year_month_weekday_last::ok — std::chrono::year_month_weekday_last::ok (yes the name is the same twice, it's giving "I said what I said" 😌)

🌸 SYNOPSIS 🌸

constexpr bool ok() const noexcept;

(since C++20) ✨

🦋 DESCRIPTION 🦋

Bestie, this one's literally a vibe check for your date 💅 It checks if this object represents a valid date.

And here's the tea 🍓: since a year_month_weekday_last represents the last weekday of a particular month, it's valid as long as the year, month and weekday are all valid. That's it, that's the whole check — all three have to pass their own vibe check or the whole thing flops 😭

🔥 RETURN VALUE 🔥

year().ok() && month().ok() && weekday().ok()

It literally just ANDs all three together — year().ok(), month().ok(), and weekday().ok() — and returns that 💖 No cap, it's that simple.

💜 EXAMPLE 💜

Run this code 👑

#include <cassert>
#include <chrono>
using namespace std::chrono;

int main()
{
    auto ymwdl{Tuesday[last]/11/2020};
    assert(ymwdl.ok());
    ymwdl = Tuesday[last]/-2/2021;
    assert(!ymwdl.ok());
    ymwdl += months(0); // Normalize month
    assert(ymwdl.ok());
}

So the way this works 👀 — Tuesday[last]/11/2020 is a whole mood and passes the vibe check ✅. Then Tuesday[last]/-2/2021 with that cursed negative month? Not ok, the assert fires, iconic behaviour honestly 💀. Then ymwdl += months(0); normalizes the month and suddenly we're back to valid again. Character development 🧚✨

source: http://cppreference.com · version/date: 2024.06.10

ok that's the whole page bestie, mwah 💋 — stay valid, stay normalized, and remember: assert(ymwdl.ok()) is self care 🫶💖🎀🌈⭐