NAME¶

std::experimental::atomic_weak_ptr::exchange - std::experimental::atomic_weak_ptr::exchange

Synopsis¶

weak_ptr<T> exchange( weak_ptr<T> desired, std::memory_order order =
std::memory_order_seq_cst ) noexcept;

Atomically replaces the underlying weak_ptr 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 atomic variable before the call.

Remarks

All changes to the atomic_weak_ptr object itself, and all associated use_count
increments, are guaranteed to be performed atomically. Associated use_count
decrements take place after the atomic operation, but are not required to be part of
it. Any associated destruction or deallocation operations take place after the
atomic operation and are not part of it.

See also¶

std::atomic_is_lock_free(std::shared_ptr)
std::atomic_load(std::shared_ptr)
std::atomic_load_explicit(std::shared_ptr)
std::atomic_store(std::shared_ptr)
std::atomic_store_explicit(std::shared_ptr) specializes atomic
std::atomic_exchange(std::shared_ptr) operations for
std::atomic_exchange_explicit(std::shared_ptr) std::shared_ptr
std::atomic_compare_exchange_weak(std::shared_ptr) (function template)
std::atomic_compare_exchange_strong(std::shared_ptr)
std::atomic_compare_exchange_weak_explicit(std::shared_ptr)
std::atomic_compare_exchange_strong_explicit(std::shared_ptr)
(deprecated in C++20)
(removed in C++26)