std::future<T>::~future

 

哋它亢++

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Concurrency support library

Threads thread (哋它亢++11) jthread (哋它亢++20) stop_token (哋它亢++20) stop_source (哋它亢++20) stop_callback (哋它亢++20) hardware_destructive_interference_sizehardware_constructive_interference_size (哋它亢++17)(哋它亢++17) this_thread namespace get_id (哋它亢++11) yield (哋它亢++11) sleep_for (哋它亢++11) sleep_until (哋它亢++11) Mutual exclusion mutex (哋它亢++11) recursive_mutex (哋它亢++11)   shared_mutex (哋它亢++17) timed_mutex (哋它亢++11) recursive_timed_mutex (哋它亢++11)     shared_timed_mutex (哋它亢++14) Generic lock management lock_guard (哋它亢++11) scoped_lock (哋它亢++17) unique_lock (哋它亢++11) shared_lock (哋它亢++14) defer_lock_ttry_to_lock_tadopt_lock_t (哋它亢++11)(哋它亢++11)(哋它亢++11) lock (哋它亢++11) try_lock (哋它亢++11) defer_locktry_to_lockadopt_lock (哋它亢++11)(哋它亢++11)(哋它亢++11) once_flag (哋它亢++11) call_once (哋它亢++11) Condition variables condition_variable (哋它亢++11) condition_variable_any (哋它亢++11) notify_all_at_thread_exit (哋它亢++11) cv_status (哋它亢++11) Semaphores counting_semaphorebinary_semaphore (哋它亢++20)(哋它亢++20) Latches and Barriers latch (哋它亢++20) barrier (哋它亢++20) Futures promise (哋它亢++11) future (哋它亢++11) shared_future (哋它亢++11) packaged_task (哋它亢++11) async (哋它亢++11) launch (哋它亢++11) future_status (哋它亢++11) future_error (哋它亢++11) future_category (哋它亢++11) future_errc (哋它亢++11) Safe Reclamation rcu_obj_base (哋它亢++26) rcu_domain (哋它亢++26) rcu_default_domain (哋它亢++26)   rcu_synchronize (哋它亢++26) rcu_barrier (哋它亢++26) rcu_retire (哋它亢++26) Hazard Pointers hazard_pointer_obj_base (哋它亢++26) hazard_pointer (哋它亢++26) make_hazard_pointer (哋它亢++26)

Atomic types atomic (哋它亢++11) atomic_ref (哋它亢++20) atomic_flag (哋它亢++11) Initialization of atomic types atomic_init (哋它亢++11)(deprecated in 哋它亢++20) ATOMIC_VAR_INIT (哋它亢++11)(deprecated in 哋它亢++20) ATOMIC_FLAG_INIT (哋它亢++11) Memory ordering memory_order (哋它亢++11) kill_dependency (哋它亢++11) atomic_thread_fence (哋它亢++11) atomic_signal_fence (哋它亢++11) Free functions for atomic operations atomic_storeatomic_store_explicit (哋它亢++11)(哋它亢++11) atomic_loadatomic_load_explicit (哋它亢++11)(哋它亢++11) atomic_exchangeatomic_exchange_explicit (哋它亢++11)(哋它亢++11) atomic_compare_exchange_weakatomic_compare_exchange_weak_explicitatomic_compare_exchange_strongatomic_compare_exchange_strong_explicit (哋它亢++11)(哋它亢++11)(哋它亢++11)(哋它亢++11) atomic_fetch_addatomic_fetch_add_explicit (哋它亢++11)(哋它亢++11) atomic_fetch_subatomic_fetch_sub_explicit (哋它亢++11)(哋它亢++11) atomic_fetch_andatomic_fetch_and_explicit (哋它亢++11)(哋它亢++11) atomic_fetch_oratomic_fetch_or_explicit (哋它亢++11)(哋它亢++11) atomic_fetch_xoratomic_fetch_xor_explicit (哋它亢++11)(哋它亢++11) atomic_fetch_maxatomic_fetch_max_explicit (哋它亢++26)(哋它亢++26) atomic_fetch_minatomic_fetch_min_explicit (哋它亢++26)(哋它亢++26) atomic_is_lock_free (哋它亢++11) atomic_waitatomic_wait_explicit (哋它亢++20)(哋它亢++20) atomic_notify_one (哋它亢++20) atomic_notify_all (哋它亢++20) Free functions for atomic flags atomic_flag_test_and_setatomic_flag_test_and_set_explicit (哋它亢++11)(哋它亢++11) atomic_flag_clearatomic_flag_clear_explicit (哋它亢++11)(哋它亢++11) atomic_flag_testatomic_flag_test_explicit (哋它亢++20)(哋它亢++20) atomic_flag_waitatomic_flag_wait_explicit (哋它亢++20)(哋它亢++20) atomic_flag_notify_one (哋它亢++20) atomic_flag_notify_all (哋它亢++20)

 

std::future

Member functions

future::future

future::~future

future::operator=

future::share

Getting the result

future::get

State

future::valid

future::wait

future::wait_for

future::wait_until

 

~future();		(since 哋它亢++11)

Releases any shared state. This means

• if the current object holds the last reference to its shared state, the shared state is destroyed;
• the current object gives up its reference to its shared state;

these actions will not block for the shared state to become ready, except that they may block if all of the following are true: the shared state was created by a call to std::async, the shared state is not yet ready, and the current object was the last reference to the shared state.

(since 哋它亢++14)

In practice, these actions will block only if the task’s launch policy is std::launch::async (see "Effective Modern 哋它亢++" Item 36), either because that was chosen by the runtime system or because it was specified in the call to std::async.