std::atomic<T>::exchange (3) - Linux Manuals

std::atomic<T>::exchange: std::atomic<T>::exchange

NAME

std::atomic<T>::exchange - std::atomic<T>::exchange

Synopsis

T exchange( T desired, std::memory_order order = std::memory_order_seq_cst ) noexcept; (since C++11)
T exchange( T desired, std::memory_order order = std::memory_order_seq_cst ) volatile noexcept;

Atomically replaces the underlying value with desired. The operation is 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 atomic variable before the call.