Aggragate objects

[Thomas Tierney]

Hey all

I would like to aggragate objects off of a single primary object.
For instance, I have an object called foo with 3 object a, b and c. All of these objects have read only properties that will be drived from the main object. I can not see a way to get this information to these objects. In C++ I would pass this info view the constructor but you cant do that here..

What were your solutions?

Thanks

[Scott Slater]

You could create an "Initialize" method that can only be called one time right after object creation. It takes what is done in C++ and turns it into two steps. You can set an Instance variable to show that the object has been initialized so subsequent calls to the "Initialize" method would be ignored.

[Thomas Tierney]

Thanks for the response Scott!1

The one problem I am having is conceptualizing setting private/read only data from the base object to the aggragate objects.

Any thoughts?

[Scott Slater]

Thanks for the response Scott!1

The one problem I am having is conceptualizing setting private/read only data from the base object to the aggragate objects.

Any thoughts?

Unfortunately the INSTANCE variables are not inherited from the parent class (like in C++), so they cannot be directly modified from derivative classes. I think this is because PB is only following the COM spec. There are only 2 ways that I can see around this. 1) Use globals and move classes into a DLL (making the globals private to only the classes within the libary) or 2) you will have to have methods in the parent class that allow modifying the private variables (but then they're really not private are they).

[Thomas Tierney]

Thanks Scott, I was afraid of that.. you left out two more options.. Use C++ or VB.

[Scott Slater]

Thanks Scott, I was afraid of that.. you left out two more options.. Use C++ or VB.

Don't forget C#

[Trevor Lane]

Originally Posted by Thomas Tierney
Thanks Scott, I was afraid of that.. you left out two more options.. Use C++ or VB.

VB!, I Thought the problem was that PB was only capable of dealing with COM in the same manner as VB. VB only has the default paramaterless constructor, VB does not allow inheritance per se.

If you know how to do it in VB then you should be able to do it in PB.

[Thomas Tierney]

meant to say VB.NET

[Edwin Knoppert]

Hey all

I would like to aggragate objects off of a single primary object.
For instance, I have an object called foo with 3 object a, b and c. All of these objects have read only properties that will be drived from the main object. I can not see a way to get this information to these objects. In C++ I would pass this info view the constructor but you cant do that here..

What were your solutions?

Thanks

Not sure if this is the same as inheritance?
In my class i often add a 'backdoor' interface.
This interface set's the values.
Using a macro i can instantiate and set some data, then it looks a little as there was a constructor with params

[Thomas Tierney]

Thats an option but I am having a problem with PB returning objects in VBScript. I have an email to support on that but it has been a week now and no response.