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From: Peter Dimov (pdimov_at_[hidden])
Date: 2007-03-24 13:29:12

Braddock Gaskill wrote:

> Except for that pesky "cancelation handler" callback, a cancel() call
> is the same as set_exception(future_cancel()) on the promise. Thus
> it kind of breaks the promise/future split.

In my proposed model, cancel() doesn't place an exception into the future.
It's a consumer-side operation, used to indicate that the consumer is no
longer interested in the outcome. set_exception( fork_canceled() ) is called
by the producer if the cancel() call succeeds in canceling the task before
it has finished.

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