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Sunday, May 18, 2008

C++ Diamond Problem

 May 18, 2008     CPP     No comments   

What is the need for Virtual base classes?

  • Required in scenarios of multiple inheritance where the derivation is like diamond.

  • Compiler reports an error since there is a ambiguity since the derived class (Derived3) sees 2 instance of base class (Base).
  • Using the keyword virtual in the derived classes (Derived1, Derived2) resolves this ambiguity by allowing them to share a single instance of base class.

EXAMPLE: Demonstrate the compilation error in the Diamond problem

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