std::system_error (3) Linux Manual Page

std::system_error – std::system_error

Synopsis

Defined in header <system_error>
class system_error; (since C++11)
std::system_error is the type of the exception thrown by various library functions (typically the functions that interface with the OS facilities, e.g. the constructor of std::thread) when the exception has an associated std::error_code, which may be reported.
 std-system error-inheritance.svg
Inheritance diagram

Member functions

              constructs the system_error object
constructor (public member function)
              returns error code
code (public member function)

what returns explanatory string
              (virtual public member function)
[virtual]

Inherited from std::exception

Member functions

destructor destroys the exception object
             (virtual public member function of std::exception)
[virtual]

what returns an explanatory string
             (virtual public member function of std::exception)
[virtual]

Example

// Run this code

#include <thread>

#include <iostream>

#include <system_error>
int main()

{
    try {
        std::thread().detach(); // attempt to detach a non-thread
    } catch (const std::system_error &e) {
        std::cout << "Caught system_error with code " << e.code()
                  << " meaning " << e.what() << '\n';
    }
}

Output:

  Caught system_error with code generic:22 meaning Invalid argument