interface in c++

An interface in C++ is a way to define a contract or a blueprint for a class. It specifies a set of methods that a class must implement. Here are the steps to create an interface in C++:

1. Declare the interface: In C++, an interface is declared using the class keyword with the virtual keyword before each method declaration. For example:

class Interface {
public:
    virtual void method1() = 0;
    virtual void method2() = 0;
};

1. Implement the interface: To implement the interface, you need to create a class that inherits from the interface and provides implementations for all the methods declared in the interface. For example:

class MyClass : public Interface {
public:
    void method1() {
        // Implementation for method1
    }
    void method2() {
        // Implementation for method2
    }
};

1. Use the interface: Once the interface is declared and implemented, you can use it to create objects of the implementing class. For example:

Interface* obj = new MyClass();
obj->method1();
obj->method2();
delete obj;

1. Polymorphism: Interfaces are often used in C++ to achieve polymorphism. Polymorphism allows you to treat objects of different classes that implement the same interface as if they were the same type. For example:

void someFunction(Interface* obj) {
    obj->method1();
    obj->method2();
}

MyClass obj1;
SomeOtherClass obj2;

someFunction(&obj1);
someFunction(&obj2);

By using an interface, you can write functions that can work with different types of objects as long as they implement the same interface.

That's it! These are the steps to create an interface in C++.