How do I apply dependency injection in C++?

Dependency Injection (DI) is a design pattern used to implement IoC (Inversion of Control), allowing for better code modularity and testability. In C++, DI can be accomplished in various ways, including constructor injection, setter injection, and interface injection.

This example demonstrates how to use constructor injection to achieve dependency injection in C++:


    #include 
    #include 

    class IService {
    public:
        virtual void serve() = 0;
    };

    class Service : public IService {
    public:
        void serve() override {
            std::cout << "Service is serving!" << std::endl;
        }
    };

    class Client {
    private:
        std::shared_ptr service;
    
    public:
        // Dependency is injected via constructor
        Client(std::shared_ptr svc) : service(svc) {}
        
        void doSomething() {
            service->serve();
        }
    };

    int main() {
        std::shared_ptr service = std::make_shared();
        Client client(service);
        client.doSomething(); // Output: Service is serving!

        return 0;
    }

How do I apply dependency injection in C++?

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How do I apply dependency injection in C++?

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