std::error_category(3)

💖 NAME 💖

std::error_category - std::error_category

Okay bestie, this is page std::error_category(3) from the C++ Standard Libary manual, and we are gonna make it make sense together 🫶

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🌸 Synopsis 🌸

Defined in header <system_error>
class error_category;             (since C++11)

So std::error_category is the base class for specific error category types — think std::system_category, std::iostream_category, etc. Each specific category class defines the error_code - error_condition mapping and holds the explanatory strings for all error_conditions. The objects of error category classes are treated as singletons, passed by reference. Periodt 💅

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🎀 Member functions 🎀

• constructor — constructs an error_category (public member function) ✨
• destructor — destructs an error_category; tagged [virtual] (virtual public member function)
• operator= — not copy assignable; tagged [deleted] (public member function)
• name — obtains the name of the category; tagged [virtual] (virtual public member function) 🏷️
• default_error_condition — maps error_code to error_condition; tagged [virtual] (virtual public member function) 🔁
• equivalent — compares error_code and error_condition for equivalence; tagged [virtual] (virtual public member function) ⚖️
• message — obtains the explanatory string; tagged [virtual] (virtual public member function) 💬

Then there's the operator crew, exactly as the page lists it:

• operator==
• operator!=
• operator< — compares two error categories
• operator<=> — (function)
• (removed in C++20)
• (removed in C++20)
• (C++20)

🌈 Specific error categories 🌈

• generic_category — identifies the generic error category; (C++11) (function) 🌱
• system_category — identifies the operating system error category; (C++11) (function) 🖥️
• iostream_category — identifies the iostream error category; (C++11) (function) 🌊
• future_category — identifies the future error category; (C++11) (function) 🔮

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⭐ See also ⭐

• error_condition — holds a portable error code; (C++11) (class) 🧳
• error_code — holds a platform-dependent error code; (C++11) (class) 🧩

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made with 💖 from http://cppreference.com, version/date 2024.06.10, page std::error_category(3). bye bestie, go slay those error categories 🦋👑