NAME

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
(C++11) (function)
errc the std::error_condition enumeration listing all standard <cerrno>
(C++11) macro constants
(class)