D has a concept of iterators, which are similar to python's
iterators, but more general (python iterators are roughly
equivalent to input ranges). There are no generator functions in
D, but you can use fibers to get similar functionality, as Nick
Sabalausky showed in this thread:
http://forum.dlang.org/thread/[email protected]
I've put a simple example that uses a similar approach here:
http://dpaste.dzfl.pl/051751d1
But if you use this, performance will suffer. The last time I
tried it, fiber based ranges were limited to something like 20
million iterations (which is similar to python's generators) on
my machine . Simple ranges, on the other hand, can do billions of
iterations per second in some cases.
