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std::future_error

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C++
 
Thema Support-Bibliothek
Threads
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Threads
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thread(C++11)
this_thread Namespace
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this_thread namespace
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get_id(C++11)
yield(C++11)
sleep_for(C++11)
sleep_until(C++11)
Gegenseitigen Ausschluss
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Mutual exclusion
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mutex(C++11)
timed_mutex(C++11)
Generische Sperrverwaltung
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Generic lock management
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lock_guard(C++11)
unique_lock(C++11)
defer_lock_t
try_to_lock_t
adopt_lock_t		(C++11)
(C++11)
(C++11)
lock(C++11)
try_lock(C++11)
defer_lock
try_to_lock
adopt_lock		(C++11)
(C++11)
(C++11)
Zustand Variablen
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Condition variables
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condition_variable(C++11)
condition_variable_any(C++11)
notify_all_at_thread_exit(C++11)
cv_status(C++11)
Futures
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Futures
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promise(C++11)
future(C++11)
shared_future(C++11)
packaged_task(C++11)
async(C++11)
launch(C++11)
future_status(C++11)
future_error(C++11)
future_category(C++11)
future_errc(C++11)
 
std::future_error
Member-Funktionen
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Member functions
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future_error::future_error
future_error::code
future_error::what
 
definiert in Header <future>
class future_error;
 (seit C++11)
Die Klasse std::future_error definiert eine Ausnahme-Objekt, das im Fehlerfall durch die Funktionen in der Thread-Bibliothek geworfen wird, die sich mit asynchronen Ausführung und gemeinsame Zustände (std::future, std::promise, etc). Ähnlich std::system_error trägt diese Ausnahme ein Fehlercode mit std::error_code .
Original:
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 execution and shared states (std::future, std::promise, etc). Similar to std::system_error, this exception carries an error code compatible with std::error_code.
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cpp/error/exceptioncpp/error/logic errorstd-future error-inheritance.svg
Über dieses Bild

Inheritance diagram

Inhaltsverzeichnis

[Bearbeiten] Member-Funktionen
schafft eine std::future_error Objekt
Original:
creates a std::future_error object
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(öffentliche Elementfunktion) [edit]
gibt den Fehlercode
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returns the error code
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(öffentliche Elementfunktion) [edit]
gibt die erklärende Zeichenfolge für den Fehlercode
Original:
returns the explanatory string specific to the error code
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(öffentliche Elementfunktion) [edit]

Inherited from std::logic_error

Inherited from std::exception

Member functions

[virtuell]
Zerstört das Ausnahme-Objekt
Original:
destructs the exception object
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(virtuellen öffentlichen Member-Funktion of std::exception) [edit]
[virtuell]
gibt einen erläuternden String
Original:
returns an explanatory string
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(virtuellen öffentlichen Member-Funktion of std::exception) [edit]

[Bearbeiten] Beispiel

#include <future>
#include <iostream>
 
int main()
{
    std::future<int> empty;
    try {
        int n = empty.get();
    } catch (const std::future_error& e) {
        std::cout << "Caught a future_error with code \"" << e.code()
                  << "\"\nMessage: \"" << e.what() << "\"\n";
    }
}

Output: 

Caught a future_error with code "future:3"
Message: "No associated state"

[Bearbeiten] Siehe auch

(C++11)
auf die künftigen Fehlercodes
Original:
identifies the future error codes
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(enum) [edit]
Von „https://de.cppreference.com/mwiki/index.php?title=cpp/thread/future_error&oldid=30051“