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std::atomic_ref<T>::exchange

From cppreference.com
< cpp‎ | atomic‎ | atomic ref
 
 
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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.

[edit] Parameters

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

[edit] Return value

The value of the referenced object before the call.