Our GSoC student, Denis Blank, has done a very nice write up of his work over the summer here. In the blog, he outlines his work re-implementing hpx::util::unwrapped as well as his contributions to unify the hpx::wait and hpx::when API. He illustrates the implementations with code snippets and links to the pull requests he created. It is a pleasant read and a very useful resource to coders new to HPX.
Enjoy!