[Issue 5506] New: StoppingPolicy.longest doesn't work well

[d-bugmail]

http://d.puremagic.com/issues/show_bug.cgi?id=5506

           Summary: StoppingPolicy.longest doesn't work well
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: wrong-code
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nob...@puremagic.com
        ReportedBy: bearophile_h...@eml.cc


--- Comment #0 from bearophile_h...@eml.cc 2011-01-30 04:59:21 PST ---
The purpose of std.range.StoppingPolicy.longest is to change the behaviour of
zip to "Stop when the longest range is exhausted". But this code with DMD 2.051
shows it doesn't stop looping (problem found by tsukikage):


import std.c.stdio:printf;
import std.range: zip, StoppingPolicy;
void main() {
    int[] array = [1, 2];
    auto count = 0;
    foreach (p; zip(StoppingPolicy.longest, array))
        if (count++ < 30)
            printf("%d\n", p[0]);
        else
            break;
}


Output:
1
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

------------------------------

Additionally a small enhancement request. Instead of writing:
zip(StoppingPolicy.longest, array)

I think this is enough, and shorter, but a bit less clear, so I am not sure if
this OK:
zip(Zip.longest, array)

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