Create timed make_ready_future

[hkaiser]

Create a facility returning a future wrapping a given value which will get ready at a given point in time. This facility should be overloaded for boost::posix_time::ptime, boost::posix_time::time_duration, and the corresponding chrono time_point and time_duration types.

Suggested names would be

hpx::make_ready_future_at(boost::posix_time::ptime const const& at, ...);

template <typename Clock, typename Duration>
hpx::make_ready_future_at(boost::chrono::time_point<Clock, Duration> const& at, ...);

and

hpx::make_ready_future_after(boost::posix_time::time_duration const& d, ...);

template <typename Rep, typename Period>
hpx::make_ready_future_after(boost::chrono::duration<Rep, Period> const& d, ...);