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holipop

•Created by holipop on 6/16/2024 in #help

Porting a tiny library from Lua to C#

For context, I work with LOVE which is a game framework for Lua. One of the planned updates is API to allow people to make their own language bindings and C# is popular with making games so I figured, why not try and port a really tiny library over to C# just for fun, even if its not gonna be useful right now? (the lib in question, it's a scene manager and its just like 130 lines) https://github.com/tesselode/roomy/tree/master Here's my roadblock though: In Lua, using Roomy would look like this:

local manager = roomy.new()

local scene = {}
function scene.eventA (x, y)
  print(x + y)
end
function scene.eventB (arr)
  for i = 1, #arr do
    print(arr[i])
  end
end

manager.push(scene)
manager.emit("eventA", 2, 4) -- prints 6
manager.emit("eventB", { "foo", "bar", "egg" }) -- prints "foo", "bar", "egg"

local manager = roomy.new()

local scene = {}
function scene.eventA (x, y)
  print(x + y)
end
function scene.eventB (arr)
  for i = 1, #arr do
    print(arr[i])
  end
end

manager.push(scene)
manager.emit("eventA", 2, 4) -- prints 6
manager.emit("eventB", { "foo", "bar", "egg" }) -- prints "foo", "bar", "egg"

What I'd like is to replicate this same sort of behavior as close as possible, keeping Emit as a method that takes a name of an event and looks for it in a Scene, passing in the remaining parameters but I don't know how to ensure strong typing for different events. Just having object[] works but it'd mean every event would have to add type checking at the top of their definitions.

var manager = new Manager();
var scene = new Dictionary<string, Action>();

scene["eventA"] = (int x, int y) => {
  Console.WriteLine(x + y);
}
scene["eventB"] = (string[] arr) => {
  foreach (var str in arr) Console.WriteLine(str);
}

manager.Push(scene);
manager.Emit("eventA", 2, 4);
manager.Emit("eventB", new string[] { "foo", "bar", "egg" })

var manager = new Manager();
var scene = new Dictionary<string, Action>();

scene["eventA"] = (int x, int y) => {
  Console.WriteLine(x + y);
}
scene["eventB"] = (string[] arr) => {
  foreach (var str in arr) Console.WriteLine(str);
}

manager.Push(scene);
manager.Emit("eventA", 2, 4);
manager.Emit("eventB", new string[] { "foo", "bar", "egg" })

Hope that explains enough, I might be missing some details

2 replies

CC#

•Created by holipop on 5/14/2024 in #help

Getting the typeof this to use in a generic method

I have a class with a method that requires a different class that has a generic method. How can I get the type of the first class to pass into the generic method?

public class Foo
{
  void GenericMethod<T> () {}
}

public class Bar
{
  void Pass (Foo foo)
  {
    // I want to get Bar to use as T but I'm unsure how to search for this problem and this doesn't work.
    Type T = this.GetType();
    foo.GenericMethod<T>();
  }
}

public class Foo
{
  void GenericMethod<T> () {}
}

public class Bar
{
  void Pass (Foo foo)
  {
    // I want to get Bar to use as T but I'm unsure how to search for this problem and this doesn't work.
    Type T = this.GetType();
    foo.GenericMethod<T>();
  }
}

14 replies

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