ATL has a lot of great tools for COM programming and CComPtr is a good example. It's a smart pointer class which manages the reference count of an underlying COM object. One of it's limitations though is it will only work properly when the inheritance
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See my previous two posts on an introduction to placement new if you are unfamiliar with the subject. http://blogs.msdn.com/jaredpar/archive/2007/10/16/c-new-operator-and-placement-new.aspx http://blogs.msdn.com/jaredpar/archive/2007/10/17/c-placement-new-and-allocators.aspx
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