std::system_error

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std::system_error
 
Defined in header <system_error>
class system_error;
 (since 哋它亢++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.

cpp/error/exceptioncpp/error/runtime errorstd-system error-inheritance.svg

Inheritance diagram

Member functions

 constructs the system_error object
(public member function)
replaces the system_error object
(public member function)
returns error code
(public member function)
[virtual]
 returns an explanatory string
(virtual public member function)

Inherited from std::exception

Member functions

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

Example

Run this code
#include <iostream>
#include <system_error>
#include <thread>
 
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";
    }
}

Possible output: 

Caught system_error with code [generic:22] meaning [Invalid argument]
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