[Issue 6621] New: Superimposition amount for std.range.chunks

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6621

           Summary: Superimposition amount for std.range.chunks
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2011-09-08 00:29:12 PDT ---
std.range.chunks is quite useful. For it a rather useful third optional
argument (that defaults to 0) is how many items are repeated from the precedent
chunk:

auto data = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

chunks(data, 3, 0) ==> (default, as now)
[[1, 2, 3], [4, 5, 6], [7, 8, 9], [10]]

chunks(data, 3, 1) ==>
[[1, 2, 3], [3, 4, 5], [5, 6, 7], [7, 8, 9], [9, 10]]

chunks(data, 3, 2) ==>
[[1, 2, 3], [2, 3, 4], [3, 4, 5], [4, 5, 6], [5, 6, 7], [6, 7, 8], [7, 8, 9],
[8, 9, 10]]


In Python I use now and then a lazy generator with such extra argument.

The third argument can't be higher than the second (if they are equal it's like
cycle on a slice).

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