std::atomic_ref<T>:: exchange

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atomic_ref::exchange
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T exchange ( T desired, std:: memory_order order = std:: memory_order_seq_cst ) const noexcept ;
(since C++20)

Atomically replaces the value of the referenced object with desired . The operation is a read-modify-write operation. Memory is affected according to the value of order .

Parameters

desired - value to assign
order - memory order constraints to enforce

Return value

The value of the referenced object before the call.

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