std::latch::latch(3)

💅 NAME 💅

Okay so bestie, welcome to the std::latch::latch(3) page from the C++ Standard Libary manual. The NAME line is std::latch::latch - std::latch::latch, and that’s the whole name vibe. 🎀

🧵 Synopsis 🧵

Both of these are since C++20, periodt:

constexpr explicit latch( std::ptrdiff_t expected ); (1) (since C++20)
latch( const latch& ) = delete;                      (2) (since C++20)

1. Builds a latch and initializes its internal counter. The behavior is undefined if expected is negative or greater than max() — not “undefined” like cute mysterious, undefined like do-not-do-it, fr fr. 😭
2. The copy constructor is deleted. latch is neither copyable nor movable. So no duplicating, no yeeting it around by copy/move. 💀

🌸 Parameters 🌸

• expected — the initial value of the internal counter. That’s the starting number, bestie. ✨

🫶 Exceptions 🫶

Throws nothing. Literally nothing. Clean, quiet, lowkey iconic. 💖

🎀 Friendly reminder: expected being negative or greater than max() is undefined behavior, so please don’t test the universe like that. 🙈

Cute sign-off: source is http://cppreference.com 💻, version/date is 2024.06.10 📅. Mwah, slay, bye bestie. 💅🌈