On 10/9/10 18:20 CDT, dsimcha wrote:
Vote++. When I added bidirectional support for map(), I felt like any solution for doing bidirectional caching was going to suck. I considered just eliminating it, but left it because at the time I was more interested in just getting bidirectional/random access working than worrying about the cache issue. IMHO the only range that should be cached is a Cached higher order range.
Cached will be quite a story in and of itself. I can tell you for sure we need two related abstractions in std.range:
1. Lookback!Range provides a history that allows the range to look back up to n items:
auto r = lookback(file.byLine(), 20); ... r.lookback(3); // three lines before the current 2. Lookahead!Range similarly allows looking ahead: auto r = lookahead(file.byLine(), 20); ... r.lookahead(3); // three lines after the current Andrei
