Greetings.

Long time no write. :-)

I know that I can get the keys of an Associative array and do a foreach loop and remove the keys of the array, but is there an easier and quicker way?  I know that I can set any non-Associative array to [], ie,

myArr = [];

and that is sufficient or set the length to 0; but how about the Associative arrays?  Is there a quick way of doing this?

thanks,

josé

jicman schrieb:
> Greetings.
> 
> Long time no write. :-)
> 
> I know that I can get the keys of an Associative array and do a foreach loop and remove the keys of the array, but is there an easier and quicker way?  I know that I can set any non-Associative array to [], ie,
> 
> myArr = [];
> 
> and that is sufficient or set the length to 0; but how about the Associative arrays?  Is there a quick way of doing this?
> 
> thanks,
> 
> josé

To clear an AA
// some Associative Array properties
bool hasData(T,E)(T[E] aa) { return aa.length > 0; }

// by Ben Hinkle
private struct BB { void*[]b; size_t nodes; }

private union ToPtr(T) {T x; void * ptr; }

void clear(T,E)(T[E] aa) {
    ToPtr!(typeof(aa)) toptr;
    toptr.x = aa;
    BB* b = cast(BB*) toptr.ptr;
    if (b) {
        b.b = null;
        b.nodes = 0;
    }
}

aa.clear()
//D 1.x
If you mean, clearing just the keys, sorry dunno
Bjoern

"jicman" wrote
>
> Greetings.
>
> Long time no write. :-)
>
> I know that I can get the keys of an Associative array and do a foreach loop and remove the keys of the array, but is there an easier and quicker way?  I know that I can set any non-Associative array to [], ie,
>
> myArr = [];
>
> and that is sufficient or set the length to 0; but how about the Associative arrays?  Is there a quick way of doing this?
>
> thanks,
>
> josé

How about

myArr = myArr.init;

Works for both associative and standard arrays

-Steve

Steven Schveighoffer wrote:
> "jicman" wrote
>> Greetings.
>>
>> Long time no write. :-)
>>
>> I know that I can get the keys of an Associative array and do a foreach loop and remove the keys of the array, but is there an easier and quicker way?  I know that I can set any non-Associative array to [], ie,
>>
>> myArr = [];
>>
>> and that is sufficient or set the length to 0; but how about the Associative arrays?  Is there a quick way of doing this?
>>
>> thanks,
>>
>> josé
> 
> How about
> 
> myArr = myArr.init;
> 
> Works for both associative and standard arrays
> 
> -Steve 
> 
> 

I think =null works for both too.

--bb

Steven Schveighoffer Wrote:

> "jicman" wrote
> >
> > Greetings.
> >
> > Long time no write. :-)
> >
> > I know that I can get the keys of an Associative array and do a foreach loop and remove the keys of the array, but is there an easier and quicker way?  I know that I can set any non-Associative array to [], ie,
> >
> > myArr = [];
> >
> > and that is sufficient or set the length to 0; but how about the Associative arrays?  Is there a quick way of doing this?
> >
> > thanks,
> >
> > josé
> 
> How about
> 
> myArr = myArr.init;
> 
> Works for both associative and standard arrays
> 

Thanks Steve.  This one worked.

josé

jicman wrote:
> Steven Schveighoffer Wrote:
> 
>> "jicman" wrote
>>> Greetings.
>>>
>>> Long time no write. :-)
>>>
>>> I know that I can get the keys of an Associative array and do a foreach loop and remove the keys of the array, but is there an easier and quicker way?  I know that I can set any non-Associative array to [], ie,
>>>
>>> myArr = [];
>>>
>>> and that is sufficient or set the length to 0; but how about the Associative arrays?  Is there a quick way of doing this?
>>>
>>> thanks,
>>>
>>> josé
>> How about
>>
>> myArr = myArr.init;
>>
>> Works for both associative and standard arrays
>>
> 
> Thanks Steve.  This one worked.

Are you implying that
   myArr=null;
did not work?  because it should.  And it's less typing.  And avoids you having to repeat yourself.  :-)

--bb

"Bill Baxter" wrote
> jicman wrote:
>> Steven Schveighoffer Wrote:
>>
>>> "jicman" wrote
>>>> Greetings.
>>>>
>>>> Long time no write. :-)
>>>>
>>>> I know that I can get the keys of an Associative array and do a foreach loop and remove the keys of the array, but is there an easier and quicker way?  I know that I can set any non-Associative array to [], ie,
>>>>
>>>> myArr = [];
>>>>
>>>> and that is sufficient or set the length to 0; but how about the Associative arrays?  Is there a quick way of doing this?
>>>>
>>>> thanks,
>>>>
>>>> josé
>>> How about
>>>
>>> myArr = myArr.init;
>>>
>>> Works for both associative and standard arrays
>>>
>>
>> Thanks Steve.  This one worked.
>
> Are you implying that
>    myArr=null;
> did not work?  because it should.  And it's less typing.  And avoids you
> having to repeat yourself.  :-)

Ha ha! jicman liked my idea better.  Jealous much?

j/k, I like your solution better :)

-Steve

Steven Schveighoffer:
> Ha ha! jicman liked my idea better.  Jealous much?
> j/k, I like your solution better :)

Try this:

import std.stdio;
void main() {
    int[int] a = [10:20, 30:40];
    auto b = a;
    writefln(a, " ", b);
    a = null;
    writefln(a, " ", b);
}

It outputs:

[10:20,30:40] [10:20,30:40]
[] [10:20,30:40]

Bye,
bearophile

Bill Baxter Wrote:

> jicman wrote:
> > Steven Schveighoffer Wrote:
> > 
> >> "jicman" wrote
> >>> Greetings.
> >>>
> >>> Long time no write. :-)
> >>>
> >>> I know that I can get the keys of an Associative array and do a foreach loop and remove the keys of the array, but is there an easier and quicker way?  I know that I can set any non-Associative array to [], ie,
> >>>
> >>> myArr = [];
> >>>
> >>> and that is sufficient or set the length to 0; but how about the Associative arrays?  Is there a quick way of doing this?
> >>>
> >>> thanks,
> >>>
> >>> josé
> >> How about
> >>
> >> myArr = myArr.init;
> >>
> >> Works for both associative and standard arrays
> >>
> > 
> > Thanks Steve.  This one worked.
> 
> Are you implying that
>     myArr=null;
> did not work?  because it should.  And it's less typing.  And avoids you
> having to repeat yourself.  :-)

No, I just tried the .init and it worked and that is what I wanted. .-)