On Wed, Dec 19, 2018 at 10:38:06AM -0500, Steven Schveighoffer via Digitalmars-d-learn wrote: [...] > Looking at the code for chunkBy, it seems to me that the > implementation is quite complex for what in my head should be a simple > wrapper... [...]
It was originally a simple wrapper when I first submitted it, but Andrei requested to use RefCounted in order to work around the subrange traversal problem. I.e., in the original implementation, the underlying range traversed twice, once when each subrange is consumed, and once when you call popFront on the outer range. Having RefCounted allows us to retain a reference to the original range so that subranges will also advance the underlying range as seen by the outer range, thereby eliminating calling popFront on the underlying range twice per element. T -- People who are more than casually interested in computers should have at least some idea of what the underlying hardware is like. Otherwise the programs they write will be pretty weird. -- D. Knuth
