Re: Subclassing from my own plugin

["Theodore H. Smith" <delete at elfdata dot com>]

On 23 Dec 2006, at 23:23, Alfred Van Hoek wrote:

> On Dec 23, 2006, at 5:56 PM, Theodore H.Smith wrote:
>
> > Both classes are within my ElfData plugin, btw. I'm not  
> > subclassing any RB classes!
>
> Theodore,
>
> If You define:
>
> REALclassDefinition SubClassA = {
>         kCurrentREALControlVersion,
>         "ClassA",
>         nil,
>         sizeof(SubClassAData),
>         0,
> };
>
> REALclassDefinition SubClassB = {
>         kCurrentREALControlVersion,
>         "ClassB",
>         "ClassA",
>         sizeof(SubClassBData),
>         0,
> };
>
> REALclassDefinition SubClassC = {
>         kCurrentREALControlVersion,
>         "ClassC",
>         "ClassB",
>         sizeof(SubClassCData),
>         0,
> };
>
>
> Then the instance in the following macros
>
> ClassData(SubClassC, SubClassCData, instance, dataC);
> ClassData(SubClassB, SubClassBData, instance, dataB);
> ClassData(SubClassA, SubClassAData, instance, dataA);
>
> will lead to valid dataA, dataB, and dataC pointers if a user would  
> have instantiated a ClassC object.
I know that Alfred.

That's not my question. Can you re-read please?



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From  Sun 24 Dec 2006 01:16:20 +0100
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From: support at monkeybreadsoftware dot de (Christian Schmitz)
Date: Sun, 24 Dec 2006 01:16:20 +0100
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Subject: Re: Subclassing from my own plugin
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Theodore H. Smith <delete at elfdata dot com> wrote:

> I've started making my first plugin class which is a subclass of =20
> another class.
Ok.

> Now, I have a question. Are there any known issues with this?
No.
=20
> Basically, I'm assuming that subclassing in RB works like it's =20
> supposed to.
Yes. But if you subclass RB and C++ you have two sub classes which do
not work together directly.

> struct b {
>       int f1;
>       int f2;
> };
No. You should not assume that RB stored the data from a before or
behind the b data.

So you go the way Alfred showed. With different structs for each class.

> Otherwise, I must pass around 2 or 3 pointers to some functions when
> I really only wanted to access one pointer :(
I do normally declare a struct with all the fields ever used in the
subclasses and than only use that one struct for all.

Gru=DF
Christian

--=20
Around eleven thousand functions in one REALbasic plug-in.=20
The Monkeybread Software Realbasic Plugin v6.5. Now universal!
<http://www.monkeybreadsoftware.de/realbasic/plugins.shtml>
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