How do I implement the visitor pattern in web servers with C++?

The Visitor Pattern is a design pattern that allows you to separate algorithms from the objects on which they operate. This pattern is particularly useful when dealing with operations that need to be performed on a set of objects that may have different types.

In a web server context, you might have various types of requests (like HTTP GET, POST, etc.) and various types of responses. The Visitor Pattern allows different operations to be applied to these requests and responses without changing their classes.


            // Sample Visitor Pattern Implementation in C++
            #include 
            #include 

            class RequestVisitor; // Forward declaration

            class Request {
            public:
                virtual void accept(RequestVisitor& visitor) = 0;
            };

            class GetRequest : public Request {
            public:
                void accept(RequestVisitor& visitor) override;
            };

            class PostRequest : public Request {
            public:
                void accept(RequestVisitor& visitor) override;
            };

            class RequestVisitor {
            public:
                virtual void visit(GetRequest& request) = 0;
                virtual void visit(PostRequest& request) = 0;
            };

            class ConcreteVisitor : public RequestVisitor {
            public:
                void visit(GetRequest& request) override {
                    std::cout << "Processing GET request.\n";
                }
                
                void visit(PostRequest& request) override {
                    std::cout << "Processing POST request.\n";
                }
            };

            void GetRequest::accept(RequestVisitor& visitor) {
                visitor.visit(*this);
            }

            void PostRequest::accept(RequestVisitor& visitor) {
                visitor.visit(*this);
            }

            int main() {
                ConcreteVisitor visitor;
                GetRequest getRequest;
                PostRequest postRequest;

                getRequest.accept(visitor); // Outputs: Processing GET request.
                postRequest.accept(visitor); // Outputs: Processing POST request.

                return 0;
            }

How do I implement the visitor pattern in web servers with C++?

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How do I implement the visitor pattern in web servers with C++?

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