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digitalmars.D.bugs - [Issue 8363] New: Provide an intutive way to clear all entries in Associative Array

reply d-bugmail puremagic.com writes:
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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next sibling parent d-bugmail puremagic.com writes:
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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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