std::promise<R>:: ~promise

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Concurrency support library

Threads

thread

(C++11)

jthread

(C++20)

hardware_destructive_interference_size hardware_constructive_interference_size

(C++17) (C++17)


                    this_thread

namespace

get_id (C++11)
yield (C++11)

sleep_for (C++11)
sleep_until (C++11)

Cooperative cancellation

stop_token (C++20)
inplace_stop_token (C++26)
never_stop_token (C++26)
stop_source (C++20)
inplace_stop_source (C++26)
stop_callback (C++20)

inplace_stop_callback (C++26)
stop_callback_for_t (C++26)
stoppable_token (C++26)
unstoppable_token (C++26)
stoppable-source (C++26)
stoppable-callback-for (C++26)

Mutual exclusion

mutex (C++11)
recursive_mutex (C++11)
shared_mutex (C++17)

timed_mutex (C++11)
recursive_timed_mutex (C++11)
shared_timed_mutex (C++14)

Generic lock management

lock (C++11)
lock_guard (C++11)
scoped_lock (C++17)
unique_lock (C++11)
shared_lock (C++14)
once_flag (C++11)
call_once (C++11)

try_lock (C++11)
defer_lock try_to_lock adopt_lock defer_lock_t try_to_lock_t adopt_lock_t (C++11) (C++11) (C++11) (C++11) (C++11) (C++11)

Condition variables

condition_variable

(C++11)

condition_variable_any

(C++11)

notify_all_at_thread_exit

(C++11)

cv_status

(C++11)

Semaphores

counting_semaphore binary_semaphore

(C++20) (C++20)

Latches and Barriers

latch

(C++20)

barrier

(C++20)

Futures

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)

Safe reclamation

rcu_obj_base (C++26)
rcu_domain (C++26)
rcu_default_domain (C++26)

rcu_synchronize (C++26)
rcu_barrier (C++26)
rcu_retire (C++26)

Hazard pointers

hazard_pointer_obj_base

(C++26)

hazard_pointer

(C++26)

make_hazard_pointer

(C++26)

Atomic types
atomic (C++11)
atomic_ref (C++20)
atomic_flag (C++11)
Initialization of atomic types
atomic_init (C++11) (deprecated in C++20)
ATOMIC_VAR_INIT (C++11) (deprecated in C++20)
ATOMIC_FLAG_INIT (C++11)
Memory ordering
memory_order (C++11)
kill_dependency (C++11) (deprecated in C++26)
atomic_thread_fence (C++11)
atomic_signal_fence (C++11)
Free functions for atomic operations
atomic_store atomic_store_explicit (C++11) (C++11)
atomic_load atomic_load_explicit (C++11) (C++11)
atomic_exchange atomic_exchange_explicit (C++11) (C++11)
atomic_compare_exchange_weak atomic_compare_exchange_weak_explicit atomic_compare_exchange_strong atomic_compare_exchange_strong_explicit (C++11) (C++11) (C++11) (C++11)
atomic_fetch_add atomic_fetch_add_explicit (C++11) (C++11)
atomic_fetch_sub atomic_fetch_sub_explicit (C++11) (C++11)
atomic_fetch_and atomic_fetch_and_explicit (C++11) (C++11)
atomic_fetch_or atomic_fetch_or_explicit (C++11) (C++11)
atomic_fetch_xor atomic_fetch_xor_explicit (C++11) (C++11)
atomic_fetch_max atomic_fetch_max_explicit (C++26) (C++26)
atomic_fetch_min atomic_fetch_min_explicit (C++26) (C++26)
atomic_is_lock_free (C++11)
atomic_wait atomic_wait_explicit (C++20) (C++20)
atomic_notify_one (C++20)
atomic_notify_all (C++20)
Free functions for atomic flags
atomic_flag_test_and_set atomic_flag_test_and_set_explicit (C++11) (C++11)
atomic_flag_clear atomic_flag_clear_explicit (C++11) (C++11)
atomic_flag_test atomic_flag_test_explicit (C++20) (C++20)
atomic_flag_wait atomic_flag_wait_explicit (C++20) (C++20)
atomic_flag_notify_one (C++20)
atomic_flag_notify_all (C++20)

~promise ( ) ;		(since C++11)

Abandons the shared state:

if the shared state is ready, releases it.
if the shared state is not ready, stores an exception object of type std::future_error with an error condition std::future_errc::broken_promise , makes the shared state ready and releases it.

Compiler support
Freestanding and hosted
Language
Standard library
Standard library headers
Named requirements
Feature test macros (C++20)
Language support library
Concepts library (C++20)
Diagnostics library
Memory management library
Metaprogramming library (C++11)
General utilities library
Containers library
Iterators library
Ranges library (C++20)
Algorithms library
Strings library
Text processing library
Numerics library
Date and time library
Input/output library
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Technical specifications
Symbols index
External libraries

Member functions
promise::promise
promise::~promise
promise::operator=
promise::swap
Getting the result
promise::get_future
Setting the result
promise::set_value
promise::set_value_at_thread_exit
promise::set_exception
promise::set_exception_at_thread_exit
Non-member Functions
swap (std::promise)
Helper Classes
uses_allocator <std::promise>

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Namespaces

Variants

std::promise<R>:: ~promise