Github user haosdent commented on the issue:
https://github.com/apache/mesos/pull/157
>Even though the Promise is local to the stack, when we return Future
shouldn't it be a copy of what's needed underneath?
Sorry, I misunderstanding something before. Future store its data in
`std::shared_ptr<Data> data` and your function return a copy instead of const
reference, so it should work.
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