[boost] [thread] Is future.then( scheduler , task ) abandoned?

On this page: http://www.boost.org/doc/libs/1_54_0/doc/html/thread/future.html And in the task list: https://svn.boost.org/trac/boost/query?status=!closed&component=thread We can see that there are plans to add async( scheduler, task ). However there are no tasks for future.then( scheduler, task ). The documentation suggests that it will be implemented in a future release. So I just wanted a confirmation: is it still planned or is it abandoned? Or is it just a missing task? Joel Lamotte