westonpace commented on a change in pull request #9095:
URL: https://github.com/apache/arrow/pull/9095#discussion_r565970329
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File path: cpp/src/arrow/util/thread_pool.h
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@@ -87,6 +87,21 @@ class ARROW_EXPORT Executor {
return SpawnReal(hints, std::forward<Function>(func));
}
+ template <typename T>
+ Future<T> Transfer(Future<T> future) {
+ auto transferred = Future<T>::Make();
+ future.AddCallback([this, transferred](const Result<T>& result) mutable {
+ Result<T> result_copy(result);
+ auto spawn_status = Spawn([transferred, result_copy]() mutable {
Review comment:
Just to elaborate. A future can have multiple callbacks so it provides
a reference to the result. No callback is allowed to steal the result. I
think I previously discussed we could introduce the concept of a "final
callback" which gets the moved result and not a reference.
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