Reference values are a powerful feature of C++ but I find they have one significant detractor. A developer can not look at an API call and determine if a parameter is being passed by reference or value (VB has the same problem). IMHO this is one item
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CComObject::CreateInstance is a light weight method for creating instances of COM objects in your code. Unfortunately the design of the API makes it easy to introduce subtle errors into your code. The two problems are it encourages manually ref counting
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