How to Define and Implement Interfaces in C ?

Expanding on Interface Declaration in C

Original Question: How do I define a class representing an interface?

Expanded Answer: An interface in C is indeed an abstract base class. However, there is one exception worth considering.

To ensure proper ownership transfer without revealing the concrete derived class, it's recommended to include a virtual destructor in the interface. This destructor doesn't require implementation, as the interface doesn't have specific members.

Example Code:

class IDemo {
public:
    virtual ~IDemo() {}
    virtual void OverrideMe() = 0;
};

class Parent {
public:
    virtual ~Parent();
};

class Child : public Parent, public IDemo {
public:
    virtual void OverrideMe() override {
        // Custom implementation
    }
};

In this example, both Parent and Child inherit from IDemo, and Child provides a concrete implementation for the OverrideMe function.

Note that while it may seem unusual to define a virtual function as inline, this practice is generally considered safe and beneficial for optimization.

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