http://d.puremagic.com/issues/show_bug.cgi?id=7896

           Summary: Sequence slicing
           Product: D
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody@puremagic.com
        ReportedBy: daniel350@bigpond.com


--- Comment #0 from Daniel <daniel350@bigpond.com> 2012-04-13 02:06:23 PDT ---
Rather then simply building an array from scratch, perhaps it should be possible to do the following:

auto my_odds = sequence!("n * 2 + 1")()[0...100]

Unless there is another way to do this.

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Dmitry Olshansky <dmitry.olsh@gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |dmitry.olsh@gmail.com


--- Comment #1 from Dmitry Olshansky <dmitry.olsh@gmail.com> 2012-04-13 02:33:47 PDT ---
Somehow take(sequence!("n * 2 + 1")(), 100) doesn't cut it or what?

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--- Comment #2 from Kenji Hara <k.hara.pg@gmail.com> 2012-04-13 02:46:20 PDT ---
(In reply to comment #0)
> Rather then simply building an array from scratch, perhaps it should be possible to do the following:
> 
> auto my_odds = sequence!("n * 2 + 1")()[0...100]
> 
> Unless there is another way to do this.

With range concept, slicing operator with boundaries has no meaning. You should use std.range.take and std.array.array like follows:

auto my_odds = array(take(sequence!("n * 2 + 1")(), 100));

And if you use 2.059beta or later, you can use UFCS syntax:

auto my_odds = sequence!("n * 2 + 1")().take(100).array();

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bearophile_hugs@eml.cc changed:

           What    |Removed                     |Added
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                 CC|                            |bearophile_hugs@eml.cc


--- Comment #3 from bearophile_hugs@eml.cc 2012-04-13 04:21:59 PDT ---
(In reply to comment #2)
> With range concept, slicing operator with boundaries has no meaning.

I think the point of this enhancement request is to give a meaning to that syntax.

So:
someRange[x .. y]

becomes syntax sugar for calling a function like:
itertools.islice(someRange, x, y)

of Python: http://docs.python.org/library/itertools.html#itertools.islice

the idea of giving some more syntax support to D lazy ranges isn't that bad.

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--- Comment #4 from Dmitry Olshansky <dmitry.olsh@gmail.com> 2012-04-13 04:37:09 PDT ---
The syntax is supported. It's just up to implementer of a range if he can provide opSlice meaningfully.

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--- Comment #5 from Daniel Cousens <daniel350@bigpond.com> 2012-08-12 05:50:52 PDT ---
Made a pull request for this: https://github.com/D-Programming-Language/phobos/pull/748

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--- Comment #6 from github-bugzilla@puremagic.com 2012-09-16 19:17:33 PDT ---
Commits pushed to master at https://github.com/D-Programming-Language/phobos

https://github.com/D-Programming-Language/phobos/commit/d9e1a501ecba84426ddde161dce7408e719a1a8b Added std.range.Sequence slicing (Issue 7896)

See http://d.puremagic.com/issues/show_bug.cgi?id=7896 for more information.

https://github.com/D-Programming-Language/phobos/commit/1b645ba717aadf175b93ab344394284008ff5d7d Merge pull request #748 from RommelVR/master

Added std.range.Sequence slicing (Issue 7896)

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Andrej Mitrovic <andrej.mitrovich@gmail.com> changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
                 CC|                            |andrej.mitrovich@gmail.com
         Resolution|                            |FIXED


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