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copy classes

Posted on 1998-12-03
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Last Modified: 2010-05-03
Hi,
I want to ask how can I copy a content of one class to another (of the the same type), with no setting a reference.
what I mean is this:

dim a as new myClass
dim b as new myClass
b = a  (NOT set b = a)
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Question by:s_lavie
9 Comments
 
LVL 14

Expert Comment

by:waty
ID: 1447977
The best solution is adding a function to your class to copy the members : CopyOwnClass(clsDest as myClass)

So, you could do as follow :

   Sub CopyOwnClass(clsDest as myClass)

       With clsDest
           .A = A
           .B = B
       End With

   End Sub

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Author Comment

by:s_lavie
ID: 1447978
Sorry waty, but this is the naive way to do so, it's not what I meant. What if you have a lots of vars in a class - would you do the same??? It's not realistic.
In C++ you just do a = b or *a = *b. Is there a similar way in VB?
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LVL 14

Expert Comment

by:waty
ID: 1447979
Error, in C++ if you do a=b; you copy the adress. So if your class contains pointer, you could go to have some incoherences.

Under C++, you have to construct a copy constructor. In this copy constructor, you copy all the members as you need. It is the same under VB, but you have to call explicitely to the copy function.
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LVL 2

Author Comment

by:s_lavie
ID: 1447980
It seems to me that there must be another way, otherwise I wouldn't ask that question.
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LVL 14

Expert Comment

by:waty
ID: 1447981
If you know another way, I would like to know it too.

Drop a mail to Microsoft.
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LVL 3

Expert Comment

by:hakyemez
ID: 1447982
dim a as new myClass
dim b as myClass
set b = a

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LVL 2

Author Comment

by:s_lavie
ID: 1447983
Hi hakyemez,
your answer setes a reference to of the class, but I want a completly different class with the same values, with out any connection, (like in numeric vars).
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LVL 13

Accepted Solution

by:
Mirkwood earned 150 total points
ID: 1447984
Impossible without coding.

Very simple reason:
A has a reference to an object C
Should B now get the reference to same object C or should C be copied.

You have to do it the way Waty says.

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LVL 2

Author Comment

by:s_lavie
ID: 1447985
Sorry Waty,I probably misunderstood the way it works!
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