An arbitrary type atomic storage with swap operations.
This is guaranteed lock-free where atomics will be guaranteed lock-free, however it is not guaranteed wait free. Some operations may spin for a short time. All values will be properly dropped.
```rust use atomic_swapping::option::AtomicSwapOption;
fn main() { let swap = AtomicSwapOption::new(Some(100usize)); asserteq!(swap.cloneinner(), Some(100usize)); asserteq!(swap.take(), Some(100usize)); asserteq!(swap.take(), None); swap.set(Some(200usize)); asserteq!(swap.swap(Some(300usize)), Some(200usize)); assert!(swap.containsvalue()); asserteq!(swap.cloneinner(), Some(300usize)); } ```
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