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std::atomic_ref<T>::fetch_xor

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atomic_ref::operator&=atomic_ref::operator|=atomic_ref::operator^=

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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.

[edit] Parameters

arg - the other argument of bitwise XOR

order - memory order constraints to enforce

[edit] Return value

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

[edit] 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`

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