How do I implement Strategy and State patterns?

The Strategy and State patterns are important design patterns in software development that allow for flexible and reusable code structures. The Strategy pattern defines a family of algorithms and makes them interchangeable, while the State pattern allows an object to alter its behavior when its internal state changes.

Strategy Pattern, State Pattern, Design Patterns, C++, Software Development, Code Reusability

This content describes the implementation of the Strategy and State patterns in C++. These patterns enhance the flexibility and maintainability of your code.


        // Strategy Pattern Example
        #include <iostream>

        class Strategy {
        public:
            virtual void execute() = 0;
        };

        class ConcreteStrategyA : public Strategy {
        public:
            void execute() override {
                std::cout << "Strategy A being executed." << std::endl;
            }
        };

        class ConcreteStrategyB : public Strategy {
        public:
            void execute() override {
                std::cout << "Strategy B being executed." << std::endl;
            }
        };

        class Context {
        private:
            Strategy *strategy;
        public:
            Context(Strategy *s) : strategy(s) {}
            void setStrategy(Strategy *s) {
                strategy = s;
            }
            void executeStrategy() {
                strategy->execute();
            }
        };

        // State Pattern Example
        class State {
        public:
            virtual void handle() = 0;
        };

        class ConcreteStateA : public State {
        public:
            void handle() override {
                std::cout << "Handling State A." << std::endl;
            }
        };

        class ConcreteStateB : public State {
        public:
            void handle() override {
                std::cout << "Handling State B." << std::endl;
            }
        };

        class ContextState {
        private:
            State *state;
        public:
            void setState(State *s) {
                state = s;
            }
            void request() {
                state->handle();
            }
        };

How do I implement Strategy and State patterns?

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How do I implement Strategy and State patterns?

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