>> I can see a situation where you might register the same function
>> multiple times with different argument lists, yet unregister takes
>> only the function as the discriminator.
Greg> One way to fix this would be to remove the ability to register
Greg> arguments along with the function. It's not necessary, as you can
Greg> always use a closure to get the same effect. Then you have a
Greg> unique handle for each registered callback.
Then you need to hang onto the closure. That might be some distance away
from the point at which the function was registered. Returning a unique id
corresponding to the specific call to atexit.register is much simpler the
than forcing the caller to build a closure.
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