[reactive] Essential Reactive functions?

[Peter Verswyvelen]

I'm building a little Reactive library in C# for fun - in the same spirit as
Conal's one - with the intension to convert that to F#, which I'm learning
now.
Right now I implemented  Future, Event and Reactive, and functionality to
merge/mappend two events.

Although I'm not yet sure it fully works, using some tricks from Reactive,
it was actually really easy to implement. I don't need unamb stuff since I
just spawn one new thread for each merged event, and I use the
WaitForMultipleObjects primitive to check which of the two event occurrences
was first. The code is of course a zillion times more ugly than in Haskell,
and since I'm not using lightweight threads, it might really be slow. I
tried to make it as immutable as possible, so it's not really imperative :)

But what is the minimal set of functions one must implement to build a
Reactive library, in the sense that all others can be implemented using
these?

Merry Xmas!
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