[DIRECT-L] V4MD: question: Xtra which create another Xtra ?

[Chuck Neal]

Well, Xtras can call base lingo, so you could make the table then let the
Xtra itself do a ...

Xtra("VTable").new("table name")
Call.  As for doing it Directly that might get tricky as it would be an Xtra
creating another Xtra instance without using lingo.  Not sure the XDK allows
for that.

-Chuck
--------------------------
Chuck Neal
CEO, MediaMacros, Inc.
chuck at mediamacros.com
http://www.mediamacros.com



-----Original Message-----
From: valentina-beta-bounces at lists.macserve.net
[mailto:valentina-beta-bounces at lists.macserve.net] On Behalf Of Ruslan
Zasukhin
Sent: Friday, July 16, 2004 2:18 PM
To: Macromedia Director; valentina-beta at lists.macserve.net
Subject: Re: [DIRECT-L] V4MD: question: Xtra which create another Xtra ?


On 7/16/04 8:59 PM, "John Mathis" <john2 at inplicity.com> wrote:

Hi John,

> Although I can't think of an applicable example using xtras, I don't 
> think there is any architectural limitation on doing that.
> 
> I know that you can achieve exactly that structure using scripts...I 
> do it all the time...I'm just foggy on the xtras part.

Scripts ? ....

But scripts this is only feature of Lingo itself, right?

We develop Valentina Database Xtra itself. So scripts I think is not
solution...

Practical usage I have show already. In c++, Java, REALbasic versions of
Valentina we have classes

    Vdatabase
    Vtable
    Vfield
    Vcursor
    Vset
    Vlink
    ......


    db = new Vdatabase

    Vtable tbl = db.CreateTable( "Person" )

    Vfield fld = tbl.CreateField( "FirstName", kTypeVarChar, 2000, fIdexed )


As you see we have chain of calls.
Supervisor class can create new instance of other class.

With XDK as far as I see we cannot do this.
Bad.


> John
> 
> ----- Original Message -----
> From: "Ruslan Zasukhin" <sunshine at public.kherson.ua>
> To: <DIRECT-L at LISTSERV.UARK.EDU>
> Sent: Friday, July 16, 2004 12:39 PM
> Subject: [DIRECT-L] V4MD: question: Xtra which create another Xtra ?
> 
> 
>> Hi Director experts,
>> 
>> In C/C++ and REALbasic we can write
>> 
>>     Set* set = field.Find( 5 )
>> 
>> Function find() have create and return object of new class.
>> 
>> And C++ and REALbasic and Java and in each normal OO language This is 
>> MUST BE feature.
>> 
>> In Director/Lingo I never have such syntax.
>> 
>> So can we do in Lingo something as:
>> 
>> 
>>         db = new (Xtra "Vdatabase")
>> 
>>         tbl = db.CreateTable( "Person" )
>> 
>> 
>> Here tbl must be of type (Xtra "VTable")
>> 
>> Is this possible in Lingo?
>> 
>> If yes, then how effective this ?
>> 
>> If no, then why no ?  :-)
>> Lingo looks claims that it have some OO features.
>> So why it not have such basic feature of OO language ?

-- 
Best regards,
Ruslan Zasukhin      [ I feel the need...the need for speed ]
-------------------------------------------------------------
e-mail: ruslan at paradigmasoft.com
web: http://www.paradigmasoft.com

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