std::errc

enum class errc;

The scoped enumeration std::errc defines the values of portable error conditions that correspond to the POSIX error codes.

Member constants

Non-member functions

Helper classes

Example

#include <iostream>
#include <system_error>
#include <thread>
 
int main()
{
    try
    {
        std::thread().detach(); // detaching a not-a-thread
    }
    catch (const std::system_error& e)
    {
        std::cout << "Caught a system_error\n";
        if (e.code() == std::errc::invalid_argument)
            std::cout << "The error condition is 'std::errc::invalid_argument'\n";
        std::cout << "The error description is '" << e.what() << "'\n";
    }
}

Caught a system_error
The error condition is 'std::errc::invalid_argument'
The error description is 'Invalid argument'

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

1. Although the corresponding POSIX error numbers ENODATA, ENOSR, ENOSTR and ETIME were marked "obsolescent" in POSIX 2017, the STREAMS API was optional and not required for conformance to the previous POSIX standard (because popular unix-like systems refused to implement it).

See also