Interface Class

An interface is used to describe a behaviour, which is followed by all of the classes deriving from the interface. An interface class does not implement any functionality. It means that such a class contains only functions declaration. Interface class functions must be implemented by derived classes.

The interface is used to provide a polymorphism. It means that several classes can implement the same interface functions in different ways.

The interface class is declared as any other class in UnigineScript. In the example, the abstract virtual function declaration is used.

class Interface {
	// functions declaration
	void update() = 0;
	//...;
}

Any class that is inherited from the Interface class must contain an implementation for its functions. For example:

class Bar : Interface {
	// implementation of the interface function for Bar
	void update() {
		log.message("Bar::update(): called\n");
	}
};
class Baz : Interface {
	// implementation of the interface function for Baz
	void update() {
		log.message("Baz::update(): called\n");
	}
};

Example

class Interface {
	void update() = 0;
}

class Foo {
	void foo() = 0;
};
class Bar : Foo, Interface {
	void update() {
		log.message("Bar::update(): called\n");
	}
};
class Baz : Interface {
	void update() {
		log.message("Baz::update(): called\n");
	}
};

Interface interfaces[0];
interfaces.append(new Bar());
interfaces.append(new Baz());
foreach(Interface i; interfaces) {
	i.update();
}

Bar::update(): called
Baz::update(): called

Abstract virtual function declaration

class Foo {
	void foo() = 0;
};