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std::system_error

STD：系统[医]误差

Defined in header ​​
class system_error;​(since C++11)

std::system_error是由各种库函数%28引发的异常类型--通常是与OS设施接口的函数，例如std::thread%29当异常有关联时std::error_code，可以报告。

二次

二次

继承图

成员函数

(constructor)constructs the system_error object (public member function)
codereturns error code (public member function)
what virtualreturns explanatory string (virtual public member function)

继承自STD：例外

成员函数

(destructor) virtualdestructs the exception object (virtual public member function of std::exception)
what virtualreturns an explanatory string (virtual public member function of std::exception)

例

二次

#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';
    }
}

二次

产出：

二次

Caught system_error with code generic:22 meaning Invalid argument

二次

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