Add waitFor to djinni::Future #175
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My project needs the ability to wait on a future with a timeout, mostly to make sure unit tests don't hang forever if unexpected things happen. I thought this might be useful for others as well.
In
waitImpl, I used the same scheme as std::condition_variable::wait_until for dealing with clocks. This way it should be easy to adddjinni::Future::waitUntilif needed.