How do I implement the visitor pattern in data processing pipelines with C++?

The Visitor Pattern is a design pattern that allows you to separate an algorithm from the object structure it operates on. This is particularly useful in processing data in pipelines, as it lets you define new operations without modifying the existing code structure.

Below is an example of how to implement the Visitor Pattern in C++ for a simple data processing pipeline.


    #include 
    #include 
    
    // Forward declarations
    class ConcreteVisitor;
    
    // Element interface
    class Element {
    public:
        virtual void accept(ConcreteVisitor& visitor) = 0;
    };
    
    // Concrete Elements
    class DataElementA : public Element {
    public:
        void accept(ConcreteVisitor& visitor) override;
        void processA() {
            std::cout << "Processing Data from Element A" << std::endl;
        }
    };

    class DataElementB : public Element {
    public:
        void accept(ConcreteVisitor& visitor) override;
        void processB() {
            std::cout << "Processing Data from Element B" << std::endl;
        }
    };
    
    // Visitor interface
    class Visitor {
    public:
        virtual void visit(DataElementA& element) = 0;
        virtual void visit(DataElementB& element) = 0;
    };
    
    // Concrete Visitor
    class ConcreteVisitor : public Visitor {
    public:
        void visit(DataElementA& element) override {
            element.processA();
        }
        
        void visit(DataElementB& element) override {
            element.processB();
        }
    };

    void DataElementA::accept(ConcreteVisitor& visitor) {
        visitor.visit(*this);
    }

    void DataElementB::accept(ConcreteVisitor& visitor) {
        visitor.visit(*this);
    }

    int main() {
        std::vector elements;
        elements.push_back(new DataElementA());
        elements.push_back(new DataElementB());

        ConcreteVisitor visitor;

        for (Element* element : elements) {
            element->accept(visitor);
        }

        // Cleanup
        for (Element* element : elements) {
            delete element;
        }

        return 0;
    }

How do I implement the visitor pattern in data processing pipelines with C++?

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How do I implement the visitor pattern in data processing pipelines with C++?

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