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C#•9mo ago

✅ Get type of current instance in a static method

    public static int GetTypeId() {
        return typeof(TypeOfInstance).Name.GetHashCode();
    }

    public static int GetTypeId() {
        return typeof(TypeOfInstance).Name.GetHashCode();
    }

how can i get the current type of the current class? this class will be inherited by other classes, and i need to get the hash code of the name of the class

42 Replies

Angius•9mo ago

That's some weird stuff you're doing there Generally, the parent class has no knowledge of child classes You can give the base class an abstract or virtual property named Hash or something, and each child class will have to implement it But, yeah, curious why you even need to do that. I never see .GetHashCode() used outside of implementing equality operators/interfaces

2spooky2playOP•9mo ago

https://github.com/RyanDeivert555/GameObject-Framework/blob/main/include/component.h i want to translate this C++ code, but the code uses macros which arent in C#

GitHub

GameObject-Framework/include/component.h at main · RyanDeivert555/G...

A framework built on top of raylib that allows for the use of a game object system akin to Unity - RyanDeivert555/GameObject-Framework

2spooky2playOP•9mo ago

its a GameObject system i want to hash the names of the Components for easy storage in the game object

Jimmacle•9mo ago

if you call GetType() that will get the actual type of the instance, but you probably don't want to be using reflection

Angius•9mo ago

Yeah, reflection is slow Wouldn't use it in a game

Jimmacle•9mo ago

and the hashcode of a type name is certainly not a good thing to choose as an identifier hashcodes aren't even guaranteed to be the same between application runs iirc

Angius•9mo ago

Yep

2spooky2playOP•9mo ago

hmm i see but there are no macros in c#, so what should i do?

Jimmacle•9mo ago

if you need a type ID system, implement something that doesn't rely on how C# is implemented even relying on type names will make your game brittle in the face of refactoring if you want something that's like a macro, look into source generators that's about the closest you'll get alternatives would be abstract/virtual methods that you override in Component derivatives or an IComponent interface to require implementing them

2spooky2playOP•9mo ago

I only have the id thing so i can store the components in a Dictionary for easy lookup protected readonly Dictionary<int, Component> Components = []; this is in the GameObject class int is the id of the component

Angius•9mo ago

Make the key a GUID maybe

2spooky2playOP•9mo ago

thats a good idea

Jimmacle•9mo ago

if it's only at runtime why not just use the type as the key

2spooky2playOP•9mo ago

wdym? one problem with that is the method cant be static. ideally i would be able to do something like this;

    public bool RemoveComponent<T>() where T: Component {
        return RemoveComponent(T.GetTypeId());
    }

    public bool RemoveComponent<T>() where T: Component {
        return RemoveComponent(T.GetTypeId());
    }

Angius•9mo ago

So you can have only one component of each type?

2spooky2playOP•9mo ago

wdym

Angius•9mo ago

If you want to be able to remove components by their type... what happens if there are multiple FooComponents? T would be FooComponent

2spooky2playOP•9mo ago

RemoveComponent<FooComponent>()
RemoveComponent<BarComponent>()
RemoveComponent<BazComponent>()

RemoveComponent<FooComponent>()
RemoveComponent<BarComponent>()
RemoveComponent<BazComponent>()

each game object can only have one type of each component. it cant have two FooComponents

Angius•9mo ago

Ah, that would work then. Long as you ensure that it is the case

2spooky2playOP•9mo ago

    public Component AddComponent(Component component) {
        component.OnCreate();
        var id = 0;
        Components[id] = component;

        return Components[id];
    }

    public Component AddComponent(Component component) {
        component.OnCreate();
        var id = 0;
        Components[id] = component;

        return Components[id];
    }

(ignore the id part right now) this would ensure that, right? Components is a dictionary

Angius•9mo ago

A dictionary cannot have conflicting keys

2spooky2playOP•9mo ago

ok i think i can work from here. thank you guys i want to make the ids static, but idk if thats possible

Angius•9mo ago

Sure is

class Foo
{
    public static Guid Id = Guid.NewGuid();
}

class Foo
{
    public static Guid Id = Guid.NewGuid();
}

Do note, though, that it will be different each time the app runs

2spooky2playOP•9mo ago

derived classes will not have their own ids though

Angius•9mo ago

It will stay the same during each individual run, though

2spooky2playOP•9mo ago

they will share the static id with the base class

Angius•9mo ago

You can make it a property and make it abstract static abstract properties are a thing nowadays

2spooky2playOP•9mo ago

public static readonly abstract Guid Id; i get an error saying A static member cannot be marked as 'abstract'

Angius•9mo ago

C#/.NET version?

2spooky2playOP•9mo ago

i downloaded .NET sdk 8.0 idk if that tells you what version i have

Angius•9mo ago

Check the csproj

2spooky2playOP•9mo ago

its 6.0.0

Angius•9mo ago

Oof, two versions old Yeah, no static abstract for you

2spooky2playOP•9mo ago

i want the latest version

Angius•9mo ago

Change that net6.0 to net8.0 then

2spooky2playOP•9mo ago

wait no its 8.0, i was looking at a dependency

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Raylib-cs" Version="6.0.0" />
  </ItemGroup>

</Project>

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Raylib-cs" Version="6.0.0" />
  </ItemGroup>

</Project>

mb still have the error though

Angius•9mo ago

Ah, seems static abstract can only be declared in an interface: https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/proposals/csharp-11.0/static-abstracts-in-interfaces

2spooky2playOP•9mo ago

damn

Angius•9mo ago

Anyway, I gotta hit the hay now, so maybe Jim will be able to help some more

2spooky2playOP•9mo ago

thank you for your help

Angius•9mo ago

Anytime

2spooky2playOP•9mo ago

ok, if i want to use Guid's, i need static abstract i think because right now each instance has a new id, which isnt what a want nevermind protected readonly Dictionary<Guid, IComponent> Components = []; cannot be done because of the static abstract

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