std::error_code::operator=(3)

💖 NAME 💖

Bestie, welcome to the std::error_code::operator=(3) page from the C++ Standard Libary manual 😌✨. The NAME line is literally std::error_code::operator= - std::error_code::operator=, and honestly? Iconic repetitive queen behavior 💅.

✨ Synopsis ✨

template< class ErrorCodeEnum >                            (1) (since C++11)
error_code& operator=( ErrorCodeEnum e ) noexcept;

error_code& operator=( const error_code& other ) = default; (2) (since C++11)
                                                            (implicitly declared)

error_code& operator=( error_code&& other ) = default;      (3) (since C++11)
                                                            (implicitly declared)

Okay so here's the tea, overload by overload 🫖:

1. This one replaces the error code and corresponding category with those representing error code enum e 💖.

It's equivalent to *this = make_error_code(e), where make_error_code is only found by argument-dependent lookup — yes, ADL is the main character here 👑.

Lowkey important: this overload participates in overload resolution only if std::is_error_code_enum<ErrorCodeEnum>::value is true 🚨.

2. This is the implicitly defined copy-assignment operator, and it assigns the contents of other to *this 🎀.
3. This is the implicitly defined move-assignment operator, and it also assigns the contents of other to *this 🦋.

🎀 Parameters 🎀

• e — error code enum to construct 🌸
• other — another error code to assign with 💜

💫 Return value 💫

*this — that's the return value, periodt 💅✨

🩹 Defect reports 🩹

The following behavior-changing defect reports were applied retroactively to previously published C++ standards 📚:

• LWG 3629, applied to C++11 — behavior as published: only std::make_error_code overloads were used. Correct behavior: ADL-found overloads are used 🔥

👀 See also 👀

• assign — assigns another error code (public member function) 💖

With love, zero cap, and full main-character energy: source/version http://cppreference.com, date 2024.06.10, page std::error_code::operator=(3) 🎀💅🫶