std::future_error
Defined in header <future> | ? | ? |
|---|---|---|
class future_error; | ? | (since C++11) |
全班std::future_error定义一个异常对象，该异常对象在线程库中处理异步执行和共享状态%28的函数失败时抛出。std::future，，，std::promise，等...%29。类似于std::system_error，此异常带有与std::error_code...
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继承图
成员函数
(constructor) | creates a std::future_error object (public member function) |
|---|---|
code | returns the error code (public member function) |
what | returns the explanatory string specific to the error code (public member function) |
继承自STD：逻辑[医]误差
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 <future>
#include <iostream>
int main()
{
std::future<int> empty;
try {
int n = empty.get(); // The behavior is undefined, but
// some implementations throw std::future_error
} catch (const std::future_error& e) {
std::cout << "Caught a future_error with code \"" << e.code()
<< "\"\nMessage: \"" << e.what() << "\"\n";
}
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可能的产出：
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Caught a future_error with code "future:3"
Message: "No associated state"二次
另见
future_errc (C++11) | identifies the future error codes (enum) |
|---|
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