std::future_errc – cppreference.com

std::future_errc

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C++
 
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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_errc
Helper-Klassen
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Helper classes
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is_error_code_enum
Non-Member-Funktionen
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Non-member functions
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make_error_code
make_error_condition
 
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definiert in Header <ios>
enum class future_errc { broken_promise, future_already_retrieved, promise_already_satisfied, no_state };
 (seit C++11)

The scoped enumeration std::future_errc defines the error codes reported by std::future and related classes in std::future_error exception objects. Only four error codes are required, although the implementation may define additional error codes. Because the appropriate specialization of std::is_error_code_enum is provided, values of type std::future_errc are implicitly convertible to std::error_code.

Mitglied Konstanten

Constant
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Constant
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 Explanation
broken_promise the asynchronous task abandoned its shared state
future_already_retrieved the contents of shared state were already accessed through std::future
promise_already_satisfied attempt to store a value in the shared state twice
no_state attempt to access std::promise or std::future without an associated shared state

Helper-Klassen

(C++11)
 extends the type trait std::is_error_code_enum to identify future error codes
(Klassen-Template)

Non-Member-Funktionen

(C++11)
 constructs a future error code
(Funktion)
(C++11)
 constructs a future error_condition
(Funktion)

Beispiel

This section is incomplete
Reason: no example

Siehe auch