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basic c++ polymorphism question

Posted on 2013-05-14
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Hi Experts,

I have a tree of different kinds of objects.  i.e., the child nodes of higher level parents are of different types.  However, they all implement a similar interface - ISomething.

If I delete any of the objects by using the interface pointer like this:

delete (ISomething*) theObject;

Am I also safely deleting the underlying full object?  I think not.

Thanks for confirming,
Mike
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Question by:thready
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jkr earned 2000 total points
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>> Am I also safely deleting the underlying full object?

As long as the base class destructor is virtual, you are - see http://www.codersource.net/c/c-miscellaneous/c-virtual-destructors.aspx ("C++ Virtual destructors") and http://blogs.msdn.com/b/oldnewthing/archive/2004/05/07/127826.aspx ("When should your destructor be virtual?"). It's actually a simple thing to do, and may have heavy impact if you don't use it.
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by:thready
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Makes sense!  Thank you! :)
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