How to Override Private Virtual Functions and Leverage Public Overload Functions in C ?

Private Pure Virtual Functions and Public Overloaded Functions

In C , private pure virtual functions are commonly used in conjunction with public overloaded non-virtual functions to effectively manage the hiding rule.

Overriding Private Virtual Functions

Contrary to common assumptions, derived classes can override private virtual functions. This allows them to provide custom implementations while maintaining a separation between the public interface and the customizable behavior.

"Public Overloaded Non-Virtuals Call Protected Non-Overloaded Virtuals" Idiom

The code example provided demonstrates a specific idiom known as "Public Overloaded Non-Virtuals Call Protected Non-Overloaded Virtuals." This idiom leverages the fact that virtual functions are not affected by the hiding rule applied to non-virtual functions. As a result, the private virtual functions can be used to implement the overloaded non-virtual functions in the base class, ensuring that the public interface remains consistent.

Use Case

This idiom is particularly useful when the public interface consists of overloaded functions that should not be hidden by custom implementations in derived classes. By using private virtual functions for the underlying implementation, derived classes can override the intended behavior without having to worry about unintentionally hiding base class members.

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