Bloomberg LP Interview Question for Software Engineer / Developers

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Virtual member functions declared with keyword virtual: allow dynamic binding of member functions. There would be exactly one v-table associated with a class that has at least one virtual function. The v-pointer of all of the class' objects would point to the class' v-table. The v-table itself has pointers to each of the virtual functions in the class. During a dispatch of a virtual function, the run-time system follows the object's v-pointer to the class's v-table, then follows the appropriate slot in the v-table to the method code.
The compiler resolves non-virtual functions exclusively at compile-time based on the type of the pointer. The compiler adds a hidden pointer (typically also a machine-word) to each object of class. the compiler initializes this->__vptr within each constructor. The idea is to cause each object's v-pointer to point at its class's v-table

- blueskin.neo November 21, 2010 | Flag Reply

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