std::generic_category (3) Linux Manual Page

std::generic_category – std::generic_category

Synopsis

Defined in header <system_error>
const std::error_category& generic_category() noexcept; (since C++11)

Obtains a reference to the static error category object for generic errors. The object is required to override the virtual function error_category::name() to return a pointer to the string "generic". It is used to identify error conditions that correspond to the POSIX errno codes.

Parameters

(none)

Return value

A reference to the static object of unspecified runtime type, derived from std::error_category.

Example

// Run this code

#include <iostream>

#include <system_error>

#include <cerrno>

#include <string>

int main()

{
    std::error_condition econd = std::generic_category().default_error_condition(EDOM);
    std::cout << "Category: " << econd.category().name() << '\n'
              << "Value: " << econd.value() << '\n'
              << "Message: " << econd.message() << '\n';
}

Output:

  Category: generic
  Value: 33
  Message: Numerical argument out of domain

See also

system_category identifies the operating system error category
                (function)
(C++11)
errc the std::error_condition enumeration listing all standard <cerrno> macro constants
                (class)
(C++11)