C#•9mo ago

❔ How to create class like MonoBehaviour from Unity

I want to learn how to create a class like that, where the functions CAN be implemented but don't have to, how to have for example start function that doesn't need to be specifically implemented in the extending class

25 Replies

Martinecko30•9mo ago

so, when using abstract, I need to implement it but using virtual I don't? and when I'm calling the function from another script would it return error or something?

MODiX•9mo ago

Zeth

REPL Result: Failure

new X();
 abstract class X {}

new X();
 abstract class X {}

Exception: CompilationErrorException

- Cannot create an instance of the abstract type or interface 'X'

- Cannot create an instance of the abstract type or interface 'X'

Compile: 298.665ms | Execution: 0.000ms | React with ❌ to remove this embed.

Martinecko30•9mo ago

I know, but with the virtual, if it doesn't need to be implemented wouldn;t it throw error as unimplemented function?

Pobiega•9mo ago

virtual means it can be overridden object.ToString() is virtual, for example

Martinecko30•9mo ago

do I need to sprecify the override?

Pobiega•9mo ago

yes

Martinecko30•9mo ago

and how to they make it that u don't have to specify the override

Pobiega•9mo ago

abstract, with a concrete implementation in a child class actually, no, that still needs an override.

Martinecko30•9mo ago

so how do I go about making the derived class not use override?

Pobiega•9mo ago

you don't. Unity is magic. remember, unity isnt real C# but why does it matter? whats wrong with having to write override void Start()?

Martinecko30•9mo ago

IDK really, I just wanted to know how to create it without the override

Pobiega•9mo ago

in that case, write your own runtime that can do whatever it wants with the IL that C# compiles to 😛 thats what Unity did

Martinecko30•9mo ago

that may be a bit out of my scope 😄

Pobiega•9mo ago

It is for 99.9999% of people, I'd say The rest of us, we use override

public abstract class MonoBehaviour
{
    public abstract void Start();
}

public class MartinEcko : MonoBehaviour
{
    public override void Start()
    {
    }
}

public abstract class MonoBehaviour
{
    public abstract void Start();
}

public class MartinEcko : MonoBehaviour
{
    public override void Start()
    {
    }
}

^ this would force it to be added

Martinecko30•9mo ago

Thanks, I'm gonna use the virtual one as sometimes I won't need all the functions

Pobiega•9mo ago

This would not:

public abstract class MonoBehaviour
{
    public virtual void Start()
    {
        
    }
}

public class MartinEcko : MonoBehaviour
{
}

public abstract class MonoBehaviour
{
    public virtual void Start()
    {
        
    }
}

public class MartinEcko : MonoBehaviour
{
}

yeah

Martinecko30•9mo ago

now the easy part, create a 3D renderer 😄

Pobiega•9mo ago

trivial 😄

// Implementing the 3d rendered was left as an exercise to the reader

// Implementing the 3d rendered was left as an exercise to the reader

Martinecko30•9mo ago

😄 i mean, I did it before, how hard can it be to do it again? 😄 this time in C# instead of Java ofc 😄

Pobiega•9mo ago

I have done silly stuff like implementing a crude 3d renderer in a console app. Do not do this. It is stupid.

Martinecko30•9mo ago

well, I need some sort of engine after what unity has done and this may only benefit me as I would have complete control over what's going on, nevertheless I could do this for a school work for my class graduation, I might just learn something 😄

Pobiega•9mo ago

sure! ambitious, but why the hell not

Martinecko30•9mo ago

I have two years to complete it, so I hope it's enough time 😄

cap5lut•9mo ago

if u want to avoid virtual methods and want to force certain shapes of methods for functionality, u could use interfaces as well. depending on how fine grained u want them, this could cause a lot of interfaces, then depending how u design the game loop the order would matter as well, because for casting/type checks the look up for if a type implements an interface is O(n)

Accord•9mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ How to create class like MonoBehaviour from Unity