Namespaces
Variants

std::atomic_ref<T>:: fetch_xor

From cppreference.net
C++
Concurrency support library
Threads
(C++11)
(C++20)
(C++17) (C++17)
this_thread namespace
(C++11)
(C++11)
Cooperative cancellation
Mutual exclusion
Generic lock management
Condition variables
(C++11)
(C++11)
(C++11)
(C++11)
Semaphores
(C++20) (C++20)
Latches and Barriers
(C++20)
(C++20)
Futures
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
Safe reclamation
Hazard pointers
(C++26)
(C++26)
(C++26)
Atomic types
(C++11)
(C++20)
(C++11)
Initialization of atomic types
(C++11) (deprecated in C++20)
(C++11) (deprecated in C++20)
(C++11)
Memory ordering
(C++11)
(C++11) (deprecated in C++26)
(C++11)
(C++11)
Free functions for atomic operations
(C++11) (C++11)
(C++11) (C++11)
(C++11) (C++11)
(C++11) (C++11) (C++11) (C++11)
(C++11) (C++11)
(C++11) (C++11)
(C++11) (C++11)
(C++11) (C++11)
(C++11) (C++11)
(C++26) (C++26)
(C++26) (C++26)
(C++11)
(C++20) (C++20)
(C++20)
(C++20)
Free functions for atomic flags
(C++11) (C++11)
(C++11) (C++11)
(C++20) (C++20)
(C++20) (C++20)
(C++20)
(C++20)
std::atomic_ref
Member functions
(C++26)
Operations for arithmetic types
(except bool and pointer-to-object)
Operations for integral types
(except bool and pointer-to-object)
(C++26)
(C++26)
Operations for integral types
(except bool )
atomic_ref::fetch_xor
Constants
Provided only when T is an integral type other than cv bool
value_type fetch_xor ( value_type arg,

std:: memory_order order =

std:: memory_order_seq_cst ) const noexcept ;
(since C++20)

Atomically replaces the current value of the referenced object with the result of bitwise XOR of the value and arg . This operation is a read-modify-write operation. Memory is affected according to the value of order .

This overload participates in overload resolution only if std:: is_const_v < T > is false .

Parameters

arg - the other argument of bitwise XOR
order - memory order constraints to enforce

Return value

The value of the referenced object, immediately preceding the effects of this function.

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 3508
( P3323R1 ) 		C++20 fetch_xor was meaningless for const T constrained to accept only non-const T