Hi, I have Class A with a virtual function Test() and Class B with virtual function Test(). No I save A and B to a root file. I can get the classtype of each key with GetClassName, but how can I store EACH class in a pointer variable of Class A ?? I must do a type cast when I call File->Get() and this must be in a way DYNAMIC. An Example: I want: ClassA* Base; Base=(ClassA*)File->Get("ClassA"); Base->Test(); (calls Test() of ClassA) Base=(ClassB*)File->Get("ClassB"); Base->Test(); (calls Test() of ClassB) But I dont KNOW at compile time what contents File has so it should be something like: ClassA* Base; Base=(key->GetClassName()*)File->Get("ClassA"); But this is of course no valid C++ code ! What is the correct way ? Joe
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