Effective C++ Ed. 3rd: Item 36. Never redefine an inherited non-virtual function

When base class pointer points to a derived class pointer and an inherited non-virtual function which is refined in derived class, the definition present in base class would execute. This happens because non-virtual functions are statically bind. So

1. Either declare only those functions non-virtual which will remain invariant in derived classes
2. Or use virtual functions or it's alternatives at defines here.

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