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compare_and_swap

concur.atomic.compare_and_swap

(expected T, new_value T)
 => 
T
Perform a bit-wise comparison of the value contained in this atomic and
`expected`. In case both values are equal, replace this value with `new_value`.

returns the old value, independent of whether the old value is bit-wise
equal to `expected` or not.
0.095dev (2025-08-15 12:02:22 GIT hash 301b5b75e77076d091b38f555473f9f0e31e5b5c built by fridi@fzen)