Hi,I tried to learn about input ranges and got some anonymous advice http://forum.dlang.org/thread/dezlxxygufocmafvl...@forum.dlang.org , still the topic seems to warrant broader attention.
The question is how pure input ranges (as in non-forward) should be build. Algorithms like take and groupBy require reference semantics. I did not find that communicated. Now I am looking for the official ruling. As in: What the D rule book says.
