std::generic_category

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

#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

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

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
http://en.cppreference.com/w/cpp/error/generic_category