Function atomic_xchg

pub unsafe fn atomic_xchg<T: Copy, const ORD: AtomicOrdering>(
    dst: *mut T,
    src: T,
) -> T

🔬This is a nightly-only experimental API. (core_intrinsics)

Stores the value at the specified memory location, returning the old value. T must be an integer or pointer type.

The stabilized version of this intrinsic is available on the atomic types via the swap method. For example, AtomicBool::swap.