embC implements object-oriented design in pure Ansi C. Is possible to implements these common features:

1. Object/Class;
2. Information hide (Public/Private);
3. Inheritance;
4. Interface;
5. Polymorphism.

The core files that implements Object/Class mechanism are:

• Object-macros.h : Contain the macros to help the design be more clean and less verbose.
• Object-private.h : Contain the private declaration of Object
• Object.h : Contain the public declaration of Object
• Object.c : Contain the implementation on Object

All new Class should inherite Object and have to implement 3 files like Point at the example:

• Point-private.h
• Point.h
• Point.c

The main.c implements a vector of 10 Object of different Class and apply some algorithm to all of them, without know its type:

#define MAX	10
int main(int argc, char ** argv) {
	void * objs[MAX];
	objs[0] = newCircle(1, 2, 3);
	objs[1] = newCar();
	objs[2] = newAmbulance();
	objs[3] = newPoint(3, 8);
	objs[4] = newCar();
	objs[5] = newAmbulance();
	objs[6] = newPoint(4, 5);
	objs[7] = newCar();
	objs[8] = newCircle(3, 7, 5);
	objs[9] = newAmbulance();
	{
		int i;
		const void * meths;
		for(i = 0; i < MAX; i++) {
			printf("--- Object %d ---\n", i);
			meths = Interface(objs[i], PointClass());
			if (meths) {
				CAST_METH(Point,meths)->draw(objs[i]);
				CAST_METH(Point,meths)->move(objs[i], 10, 20);
				CAST_METH(Point,meths)->draw(objs[i]);
			}
			meths = Interface(objs[i], SoundClass());
			if (meths) {
				CAST_METH(Sound,meths)->make_noise(objs[i]);
			}
			meths = Interface(objs[i], CarClass());
			if (meths) {
				CAST_METH(Car,meths)->run(objs[i]);
			}
			meths = Interface(objs[i], ObjectClass());
			CAST_METH(Object,meths)->destroy(objs[i]);
		}
	}
	return 0 ;
}

That produce these output:

--- Object 0 ---
circle at 1,2 rad 3
Point moving...
circle at 11,22 rad 3
--- Object 1 ---
Vrummm! Vrummm!
Car Running...
--- Object 2 ---
weeeoooeee! weeeoooeee!
Ambulance Running...
--- Object 3 ---
"." at 3,8
Point moving...
"." at 13,28
--- Object 4 ---
Vrummm! Vrummm!
Car Running...
--- Object 5 ---
weeeoooeee! weeeoooeee!
Ambulance Running...
--- Object 6 ---
"." at 4,5
Point moving...
"." at 14,25
--- Object 7 ---
Vrummm! Vrummm!
Car Running...
--- Object 8 ---
circle at 3,7 rad 5
Point moving...
circle at 13,27 rad 5
--- Object 9 ---
weeeoooeee! weeeoooeee!
Ambulance Running...

As you can see, each object only executes the interface it implements. The object Circle execute the Point interface because it is his child. Sound is an interface and the object Car implement it. Ambulance is a Car child, than it inherits its interfaces.