Re: Inheritance basic issue form newbie

From: Leor Zolman (leor_at_bdsoft.com)
Date: 04/04/04 

Date: Sun, 04 Apr 2004 03:12:54 GMT

On Sat, 3 Apr 2004 20:30:01 +0200, "Marco" <m.traversoNOSPAM@libero.it>
wrote:
>
>Well, I didn't explain the situation: it's a plug-in that is hosted in an
>external App. It is compiled into different modules that are "commands"
>called from within the host app. Every command creates a derivedX object
>with a "derivedX objx;" instruction and destroys all its local variables at
>the end of its execution. The fact is that I need to store the created
>objects so that when another command is executed it can access the
>previously created objects...
>
>I hope I clarified my "situation"...

Since I don't deal with plug-ins and such myself, I have a difficult time
relating to your particular environment, but fortunately there are lots of
other folks who read this group and are likely to have a good handle on it.

>
>>
>> >so once I create a derived1 obj1 object
>> >I need to store them in a "global container" to make them available even
>> >after the call to the destructor function (that destroys the obj1
>object).
>>
>> Whoa. Not sure what you're trying to say there, but no object remains
>> "available" after its destructor has run; that's why it is called a
>> "destructor".
>
>Actually I can store an object as a global variable, or better, a member of
>a global class (declared in another "module") that is accessible from all
>the commands.

What about having the global container (array or whatever) just store
pointers to the base class. In whatever function obj1 is first
instantiated, create a dynamically-allocated copy of obj1 and install a
pointer to in the container. Then when the original obj1 turns into a
pumpkin, you've got the copy on the free store (complete with all of its
properties) and a pointer to it.
        -leor 

-- 
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