http://d.puremagic.com/issues/show_bug.cgi?id=10535

           Summary: Add a function to druntime which returns an empty AA
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: druntime
        AssignedTo: nobody@puremagic.com
        ReportedBy: jmdavisProg@gmx.com


--- Comment #0 from Jonathan M Davis <jmdavisProg@gmx.com> 2013-07-03 22:18:30 PDT ---
Right now, the only way to get an empty AA (as opposed to a null one) is to add an element to it and then remove it, which is neither user-friendly, nor efficient. It would be easy enough to create a function which at least wrapped all that (creating the AA, adding the element, and then removing it), but it would be more efficient if the AA implementation did it, since it should be able to do it without having to add or remove an element. It would also be possible for the AA implementation to do it without using the init property (as adding and then removing an element would likely require the init property in order to get an element to add).

So, this enhancement request is for adding a function to druntime which returns an empty AA without actually adding or removing elements from the AA to do it.

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monarchdodra@gmail.com changed:

           What    |Removed                     |Added
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                 CC|                            |monarchdodra@gmail.com


--- Comment #1 from monarchdodra@gmail.com 2013-07-03 22:40:22 PDT ---
Not to hijack this, but before we add that AA specific function, we should take into account that a LOT of other objects require this. Basically, every reference semantic object in Phobos: Containers, Appender, PRNGs...

There might be a better "generic" solution to the "empty initialization" (eg: "arg-less-constructor") problem.

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hsteoh@quickfur.ath.cx changed:

           What    |Removed                     |Added
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                 CC|                            |hsteoh@quickfur.ath.cx


--- Comment #2 from hsteoh@quickfur.ath.cx 2013-08-17 13:11:48 PDT ---
(In reply to comment #1)
> Not to hijack this, but before we add that AA specific function, we should take into account that a LOT of other objects require this. Basically, every reference semantic object in Phobos: Containers, Appender, PRNGs...
> 
> There might be a better "generic" solution to the "empty initialization" (eg: "arg-less-constructor") problem.

This does not preclude adding a function to aaA.d that returns an empty but non-null AA, since that will be needed anyway no matter what generic solution is provided to the end-user.

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