std::system_error
Defined in header <system_error> | | |
|---|---|---|
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。
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继承图
成员函数
(constructor) | constructs the system_error object (public member function) |
|---|---|
code | returns error code (public member function) |
what virtual | returns explanatory string (virtual public member function) |
继承自STD：例外
成员函数
(destructor) virtual | destructs the exception object (virtual public member function of std::exception) |
|---|---|
what virtual | returns an explanatory string (virtual public member function of std::exception) |
例
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#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';
}
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产出：
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Caught system_error with code generic:22 meaning Invalid argument二次
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