• d-bugmail puremagic.com (21/21) Apr 21 2009 http://d.puremagic.com/issues/show_bug.cgi?id=2872
• d-bugmail puremagic.com (11/11) May 13 2009 http://d.puremagic.com/issues/show_bug.cgi?id=2872
• d-bugmail puremagic.com (10/10) Oct 11 2009 http://d.puremagic.com/issues/show_bug.cgi?id=2872
• d-bugmail puremagic.com (7/7) Oct 27 2009 http://d.puremagic.com/issues/show_bug.cgi?id=2872
• d-bugmail puremagic.com (13/13) Oct 27 2009 http://d.puremagic.com/issues/show_bug.cgi?id=2872
• d-bugmail puremagic.com (10/10) Jun 17 2010 http://d.puremagic.com/issues/show_bug.cgi?id=2872
• d-bugmail puremagic.com (11/11) Jun 17 2010 http://d.puremagic.com/issues/show_bug.cgi?id=2872

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=2872

           Summary: Length for Ranges
           Product: D
           Version: 2.029
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Severity: enhancement
          Priority: P4
         Component: Phobos
        AssignedTo: bugzilla digitalmars.com
        ReportedBy: dsimcha yahoo.com


Kind of a meta-enhancement, but it would be nice if all of the generic range
types in std.range and std.algorithm would try to have length properties if the
range that they're wrapping does.  For example, as far as I can tell, it
wouldn't be hard to make Map have a length property that forwards to the
underlying range's length property if it exists.

This would primarily be useful when copying generic ranges to an array, as this
can be done much more efficiently if the length is known ahead of time and the
array can be allocated exactly once, rather than appending.


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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=2872


David Simcha <dsimcha yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Length for Ranges           |Length, opIndex for Map





---
Now that I've played around more with the new Phobos, this is really just an
issue with map.  Also, opIndex for map seems like a reasonable proposition.

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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=2872


Andrei Alexandrescu <andrei metalanguage.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |andrei metalanguage.com
         AssignedTo|nobody puremagic.com        |andrei metalanguage.com


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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=2872




Created an attachment (id=482)
Revised map

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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=2872


David Simcha <dsimcha yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |patch



Here's a revised map that supports bidirectional ranges, slicing, length and
random access if the underlying range supports these.  

You may want to note in the docs, however, that random access indexing isn't
cached and therefore should only be used frequently if fun is cheap.

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d-bugmail puremagic.com writes:

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David Simcha <dsimcha yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |philippe.sigaud gmail.com



*** Issue 3871 has been marked as a duplicate of this issue. ***

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d-bugmail puremagic.com writes:

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David Simcha <dsimcha yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED



Fixed in SVN.

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