You have one of following situations:
1. Your class has virtual functions declared as = 0(eg virtual void xxxxx() = 0
2. Your class is derived from a class what have such functions.
In the first situation, you must inherit a class, implement that functions and instantiate only inherited class. In the second situation, you already have the inherited class, just implement.
In case if you can not implement them(for example is a interface of a COM object), you should use some predefined functions what returns an instance of such class, for example QueryInterface or CoCreateInstance, or something other, deppending on your situation.
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