❔ How to create class like MonoBehaviour from Unity

Martinecko30 · 2023-09-15T18:13:14.423Z

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

M

Martinecko30OP•9/15/23, 6:15 PM

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?

M

MODiX•9/15/23, 6:15 PM

Zeth

REPL Result: Failure

new X();
 abstract class X {}

new X();
 abstract class X {}

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'

- 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.

M

Martinecko30OP•9/15/23, 6:17 PM

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

P

Pobiega•9/15/23, 6:18 PM

virtual means it can be overridden

P

Pobiega•9/15/23, 6:18 PM

object.ToString()

object.ToString()

object.ToString()

object.ToString() is virtual, for example

M

Martinecko30OP•9/15/23, 6:18 PM

do I need to sprecify the override?

P

Pobiega•9/15/23, 6:18 PM

yes

M

Martinecko30OP•9/15/23, 6:19 PM

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

P

Pobiega•9/15/23, 6:19 PM

abstract, with a concrete implementation in a child class

P

Pobiega•9/15/23, 6:21 PM

actually, no, that still needs an override.

M

Martinecko30OP•9/15/23, 6:21 PM

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

P

Pobiega•9/15/23, 6:23 PM

you don't. Unity is magic.

P

Pobiega•9/15/23, 6:23 PM

remember, unity isnt real C#

P

Pobiega•9/15/23, 6:24 PM

but why does it matter?

P

Pobiega•9/15/23, 6:25 PM

whats wrong with having to write

override void Start()

override void Start()

override void Start()

override void Start()?

M

Martinecko30OP•9/15/23, 6:25 PM

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

P

Pobiega•9/15/23, 6:26 PM

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

P

Pobiega•9/15/23, 6:26 PM

thats what Unity did

M

Martinecko30OP•9/15/23, 6:26 PM

that may be a bit out of my scope

P

Pobiega•9/15/23, 6:27 PM

It is for 99.9999% of people, I'd say

P

Pobiega•9/15/23, 6:27 PM

The rest of us, we use

override

override

override

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()
    {
    }
}

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()
    {
    }
}

P

Pobiega•9/15/23, 6:28 PM

^
this would force it to be added

M

Martinecko30OP•9/15/23, 6:28 PM

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

P

Pobiega•9/15/23, 6:28 PM

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
{
}

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

public class MartinEcko : MonoBehaviour
{
}

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

public class MartinEcko : MonoBehaviour
{
}

P

Pobiega•9/15/23, 6:28 PM

yeah

M

Martinecko30OP•9/15/23, 6:28 PM

now the easy part, create a 3D renderer

P

Pobiega•9/15/23, 6:28 PM

trivial

P

Pobiega•9/15/23, 6:28 PM

P

Pobiega•9/15/23, 6:29 PM

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

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

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

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

M

Martinecko30OP•9/15/23, 6:29 PM

M

Martinecko30OP•9/15/23, 6:29 PM

i mean, I did it before, how hard can it be to do it again?

M

Martinecko30OP•9/15/23, 6:29 PM

this time in C# instead of Java ofc

P

Pobiega•9/15/23, 6:30 PM

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

P

Pobiega•9/15/23, 6:30 PM

It is stupid.

M

Martinecko30OP•9/15/23, 6:31 PM

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

P

Pobiega•9/15/23, 6:31 PM

sure!

P

Pobiega•9/15/23, 6:32 PM

ambitious, but why the hell not

M

Martinecko30OP•9/15/23, 6:36 PM

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

C

cap5lut•9/16/23, 7:31 AM

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)

A

Accord•9/17/23, 7:42 AM

Was this issue resolved? If so, run

/close

/close

otherwise I will mark this as stale and this post will be archived until there is new activity.

❔ How to create class like MonoBehaviour from Unity

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