Inheritance problem:

Hi everyone! I have a problem with inheritance.
I'm following a book (to learn more ) and when I do what the book tell me I have a problem.
I have a class entity like this:

Code (CSharp):

1. using UnityEngine;
2.  
3. public class Entity : ScriptableObject
4. {
5.     public string Name;
6.     public int Age;
7.     string Faction;
8.     public string Occupation;
9.     public int Level = 1;
10.     public int Health = 2;
11.     public int Strenght = 1;
12.     public int Magic = 0;
13.     public int Defense = 0;
14.     public int Speed = 1;
15.     public int Damage = 1;
16.     public int Armor = 0;
17.     public int NoOfAttacks = 1;
18.     public string Weapon;
19.     public Vector2 Position;
20. }

Here all fine. And now I must create a class like the next and attach it to a NPC-character (game object):

Code (CSharp):

1. using UnityEngine;
2.  
3. public class Npc : Entity
4. {
5.  
6. }

Note: yes, it is empty class but in the future I add some code
But unity doesn't permit me attach it to a game object because it tell me the class must inherit of MonoBehaviour's class.
What I must do?
If I don't attach it I can't continue with the book so I need help. I try use multiple inheritance like this:

Code (CSharp):

1. using UnityEngine;
2.  
3. public class Npc : Entity, MonoBehaviour
4. {
5.  
6. }

But it doesn't compile.
Note: the book is based on Unity 4.3 and I'm using Unity 5.2.3f1

 

http://docs.unity3d.com/ScriptReference/ScriptableObject.html

"A class you can derive from if you want to create objects that don't need to be attached to game objects."

Are you sure you want to extend this way? ScriptableObject -> Entity -> Npc?

https://msdn.microsoft.com/en-us/library/ms173156.aspx

"By using interfaces, you can, for example, include behavior from multiple sources in a class. That capability is important in C# because the language doesn't support multiple inheritance of classes."

So either the book is doing something weird, or maybe you want to Entity to extend MonoBehaviour instead. Although Entity seems to be mostly holding data and no behaviour, so maybe you want to just have it as a property/"component" on your Npc script instead of extending it?

 

First, I want say thanks a lot for your faster answer.
I suppuse is a errata's book.
I will read the interfaces. I will do what you tell me, use the entity like a component, I suppuse it is what the book wanted say.
Again, thanks a lot.