What library functionality would you most like to see in D?

[dsimcha]

== Quote from Jonathan M Davis (jmdavisProg at gmx.com)'s article
> I think that it would be useful to query the community for what piece of
> library functionality they don't currently have in D and would most like to
> see. For instance, there is no official logging framework in D or any 3rd party
> libraries which do it AFAIK. So, that could be one type of functionality that
> you may like to see. Now, there is a prospective implementation for std.log
> which shouldn't be all that far away from being reviewed, so listing that here
> wouldn't be all that useful, since it's on its way. But what other major
> functionality do you miss in D that other languages' that you use have
> available in their libraries?
> My hope here would be that we could get some good ideas going here such that
> we have can have a better idea what type of functionality it would be
> particularly useful to be working on for Phobos or 3rd party D libraries for
> the community, and maybe it'll even get some people to actually go and work on
> these ideas so that we can improve the libraries that we have to work with in
> D. We can always use more help, and we definitely need a richer library
> ecosystem for D. But even just discussing ideas could be of benefit.
> So, what major functionality which we don't currently have would you like to
> see in either Phobos or in a 3rd party library so that you could use it in
> your D programs?
> - Jonathan M Davis

I could really use a linear algebra library, but the GSoC project I'm mentoring is
oriented towards creating one and it's now close to usable.  (I'd like to thank
Cristi Cobzarenco for doing a great job on his GSoC project so far.)

Next in line would be high-level MPI wrappers, like boost::mpi, or something
functionally similar, like a std.concurrency that works across multiple address
spaces.  std.parallelism works great for SMP parallelism (which is what it was
designed to do), but sometimes I want an easy way to parallelize stuff across
address spaces, too.