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std::iostream_category(3) C++ Standard Libary std::iostream_category(3) NAME std::iostream_category - std::iostream_category Synopsis Defined in header <ios> const std::error_category& iostream_category() noexcept; (since C++11) Obtains a reference to the static error category object for iostream errors. The object is required to override the virtual function error_cate- gory::name() to return a pointer to the string "iostream". It is used to identify error codes provided in the exceptions of type std::ios_base::failure. Parameters (none) Return value A reference to the static object of unspecified runtime type, de- rived from std::error_category. Example // Run this code #include <fstream> #include <iostream> int main() { std::ifstream f("doesn't exist"); try { f.exceptions(f.failbit); } catch (const std::ios_base::failure& e) { std::cout << "Caught an ios_base::failure.\n" << "Error code: " << e.code().value() << " (" << e.code().message() << ")\n" << "Error category: " << e.code().category().name() << '\n'; } } Possible output: Caught an ios_base::failure. Error code: 1 (unspecified iostream_category error) Error category: iostream Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Cor- rect behavior LWG 2087 C++11 iostream_category was not declared noexcept de- clared noexcept See also failure stream exception (public member class of std::ios_base) io_errc the IO stream error codes (C++11) (enum) http://cppreference.com 2024.06.10 std::iostream_category(3)
NAME | Synopsis | Parameters | Return value | Example | Possible output: | See also
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