std::atomic<T>::operator=

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Concurrency support library

Threads

thread

(C++11)

jthread

(C++20)

hardware_destructive_interference_sizehardware_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)
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never_stop_token (C++26)
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stop_callback (C++20)

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

Mutual exclusion

mutex (C++11)
recursive_mutex (C++11)
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timed_mutex (C++11)
recursive_timed_mutex (C++11)
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Generic lock management

lock (C++11)
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once_flag (C++11)
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try_lock (C++11)
defer_locktry_to_lockadopt_lockdefer_lock_ttry_to_lock_tadopt_lock_t (C++11)(C++11)(C++11)(C++11)(C++11)(C++11)

Condition variables

condition_variable

(C++11)

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(C++11)

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cv_status

(C++11)

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

(C++20)

(C++20)

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Safe reclamation

rcu_obj_base (C++26)
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Hazard pointers

hazard_pointer_obj_base

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(C++26)

make_hazard_pointer

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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_storeatomic_store_explicit (C++11)(C++11)
atomic_loadatomic_load_explicit (C++11)(C++11)
atomic_exchangeatomic_exchange_explicit (C++11)(C++11)
atomic_compare_exchange_weakatomic_compare_exchange_weak_explicitatomic_compare_exchange_strongatomic_compare_exchange_strong_explicit (C++11)(C++11)(C++11)(C++11)
atomic_fetch_addatomic_fetch_add_explicit (C++11)(C++11)
atomic_fetch_subatomic_fetch_sub_explicit (C++11)(C++11)
atomic_fetch_andatomic_fetch_and_explicit (C++11)(C++11)
atomic_fetch_oratomic_fetch_or_explicit (C++11)(C++11)
atomic_fetch_xoratomic_fetch_xor_explicit (C++11)(C++11)
atomic_fetch_maxatomic_fetch_max_explicit (C++26)(C++26)
atomic_fetch_minatomic_fetch_min_explicit (C++26)(C++26)
atomic_is_lock_free (C++11)
atomic_waitatomic_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_setatomic_flag_test_and_set_explicit (C++11)(C++11)
atomic_flag_clearatomic_flag_clear_explicit (C++11)(C++11)
atomic_flag_testatomic_flag_test_explicit (C++20)(C++20)
atomic_flag_waitatomic_flag_wait_explicit (C++20)(C++20)
atomic_flag_notify_one (C++20)
atomic_flag_notify_all (C++20)

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std::atomic

Member functions
atomic::atomic
atomic::operator=
atomic::is_lock_free
atomic::store
atomic::load
atomic::operator T
atomic::exchange
atomic::compare_exchange_strongatomic::compare_exchange_weak
atomic::wait (C++20)
atomic::notify_one (C++20)
atomic::notify_all (C++20)
Constants
atomic::is_always_lock_free (C++17)
Specialized member functions
Specialized for integral, floating-point(C++20) and pointer types
atomic::fetch_add
atomic::fetch_sub
atomic::operator+=atomic::operator-=
Specialized for integral and pointer types only
atomic::fetch_max (C++26)
atomic::fetch_min (C++26)
atomic::operator++atomic::operator++(int)atomic::operator--atomic::operator--(int)
Specialized for integral types only
atomic::fetch_and
atomic::fetch_or
atomic::fetch_xor
atomic::operator&=atomic::operator\|=atomic::operator^=

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T operator=( T desired)noexcept;	(1)	(since C++11)
T operator=( T desired)volatilenoexcept;	(2)	(since C++11)
atomic& operator=(const atomic&)= delete;	(3)	(since C++11)
atomic& operator=(const atomic&)volatile= delete;	(4)	(since C++11)

1,2) Atomically assignsdesired to the atomic variable. Equivalent tostore(desired).

It is deprecated ifstd::atomic<T>::is_always_lock_free isfalse and overload(2) participates in overload resolution.

(since C++20)

3,4) Atomic variables are notCopyAssignable.

[edit]Parameters

desired

value to assign

[edit]Return value

1,2)desired

[edit]Notes

Unlike most assignment operators, the assignment operators for atomic types do not return a reference to their left-hand arguments. They return a copy of the stored value instead.