http://d.puremagic.com/issues/show_bug.cgi?id=8363

           Summary: Provide an intutive way to clear all entries in
                    Associative Array
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: puneet@coverify.org


--- Comment #0 from Puneet Goel <puneet@coverify.org> 2012-07-09 06:22:08 PDT ---
Deleting all the entries from an associative array is not intuitive. This has been discussed at the D forum here: http://forum.dlang.org/thread/iu3ll6$2d48$1@digitalmars.com

I suggest the following syntax should work

int[string] aa;
aa["foo"] = 1;
aa = []; // clear all array entries


At this point only this works. I think this is not very intuitive.

int[string] aa;
int[string] empty;

aa["foo"] = 1;
aa = empty;

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timon.gehr@gmx.ch changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |timon.gehr@gmx.ch


--- Comment #1 from timon.gehr@gmx.ch 2012-07-09 06:49:35 PDT ---
aa.clear() should work.

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--- Comment #2 from Puneet Goel <puneet@coverify.org> 2012-07-09 07:11:51 PDT ---
(In reply to comment #1)
> aa.clear() should work.

I had not tried it because the forum topic (only one year old) said that it does not worl. But it does seem too work now.

Can we add that to the Assoc array documentation here http://dlang.org/hash-map.html ?

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yebblies <yebblies@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |yebblies@gmail.com
            Summary|Provide an intutive way to  |Empty array literal does
                   |clear all entries in        |not implicitly convert to
                   |Associative Array           |associative array


--- Comment #3 from yebblies <yebblies@gmail.com> 2012-07-10 01:54:12 EST ---
(In reply to comment #0)
> aa = []; // clear all array entries
> 

This should probably work.

> 
> At this point only this works. I think this is not very intuitive.
> 
> int[string] aa;
> int[string] empty;
> 
> aa["foo"] = 1;
> aa = empty;

try

aa = null;

But be careful, don't forget AAs are reference types.

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Jonathan M Davis <jmdavisProg@gmx.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jmdavisProg@gmx.com


--- Comment #4 from Jonathan M Davis <jmdavisProg@gmx.com> 2012-07-09 10:45:46 PDT ---
> aa.clear() should work.

I believe that that's the same as setting it to null. It doesn't actually remove anything from the AA. It just makes that reference null. If you want to actually remove all of the elements from the AA, you currently have to iterate over them and call remove on each one.

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--- Comment #5 from Jonathan M Davis <jmdavisProg@gmx.com> 2012-07-09 11:02:47 PDT ---
However, with clear being renamed to destroy for 2.060 (with clear scheduled for deprecation), I don't see any problem with adding a clear function to AAs which actually clears the AA (that's probably what most everyone using clear on AAs wanted anyway). Presumably, that could be done as part of the AA implementation redesign that's currently being worked on.

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