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Sometimes it's not possible to co_await a Task, but it would still be useful to handle the result of the asynchronous operation. This change introduces a Task::then() member function, which takes a callback as an argument. The callback will be invoked when the Task is finished.
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When it is not possible to
co_awaita coroutine, we may still want to handle the resultof the coroutine asynchronously. This change introduces
Task<T>::then()continuation,which can be passed a callback that is invoked when the coroutine represented by the Task
finishes.