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std::packaged_task::packaged_task

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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::packaged_task
Member-Funktionen
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Member functions
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packaged_task::packaged_task
packaged_task::~packaged_task
packaged_task::operator=
packaged_task::valid
packaged_task::swap
Erste das Ergebnis
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Getting the result
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packaged_task::get_future
Execution
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Execution
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packaged_task::operator()
packaged_task::make_ready_at_thread_exit
packaged_task::reset
 
packaged_task()
(1)
template <class F>
explicit packaged_task(F&& f)
(2)
template <class F, class Allocator>
explicit packaged_task(std::allocator_arg_t, const Allocator& a, F&& f)
(3)
packaged_task(const packaged_task&) = delete
(4)
packaged_task(packaged_task&& rhs)
(5)
1) Constructs a std::packaged_task object with no task and no shared state.
2) Constructs a std::packaged_task object with a shared state and a copy of the task, initialized with std::forward<F>(f).
3) Constructs a std::packaged_task object with a shared state and a copy of the task, initialized with std::forward<F>(f). Uses the provided allocator to allocate memory necessary to store the task.
4) The copy constructor is deleted, std::packaged_task is move-only.
Anmerkung: C + 11 ist nicht festgelegt, hier const ist dies der defect 2067 .
Original:
Note: C++11 does not specify const here, this is the defect 2067.
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5) Constructs a std::packaged_task with the shared state and task formerly owned by rhs, leaving rhs with no shared state and a moved-from task.

[Bearbeiten] Parameter

f - the callable target (function, member function, lambda-expression, functor) to execute
a - the allocator to use when storing the task
rhs -
Die std::packaged_task aus bewegen
Original:
the std::packaged_task to move from
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[Bearbeiten] Ausnahmen

1)
noexcept specification:  
noexcept
  (seit C++11)

2-3) Any exceptions thrown by copy/move constructor of f and possiblly std::bad_alloc if the allocation fails.

5)
noexcept specification:  
noexcept
  (seit C++11)

[Bearbeiten] Beispiel