std::future_error(3) C++ Standard Libary std::future_error(3) NAME std::future_error - std::future_error Synopsis Defined in header <future> class future_error; (since C++11) The class std::future_error defines an exception object that is thrown on failure by the functions in the thread library that deal with asynchronous execu- tion and shared states (std::future, std::promise, etc). Similar to std::system_error, this exception carries an error code compatible with std::error_code. std-future error-inheritance.svg Inheritance diagram Member functions constructor creates a std::future_error object (public member function) operator= replaces the 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) Inherited from std::logic_error Inherited from std::exception Member functions destructor destroys the exception object [virtual] (virtual public member function of std::exception) what returns an explanatory string [virtual] (virtual public member function of std::exception) Example // Run this code #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_er- ror } catch (const std::future_error& e) { std::cout << "Caught a future_error with code \"" << e.code() << "\"\nMessage: \"" << e.what() << "\"\n"; } } Possible output: Caught a future_error with code "future:3" Message: "No associated state" See also future_errc identifies the future error codes (C++11) (enum) http://cppreference.com 2024.06.10 std::future_error(3)
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