Event System Error

1

I’m just testing someone’s event system, but this code caused an error. Why doesn’t it work?

public function new() {
    if (!Std.isOfType(T, Function)) {
        throw new Exception("type of customevents.Event must be function");
    }
    // etc...
}
2

I assume that T is a generic type, and in that case it cannot be used in a function (Std.isOfType()) where an actual value (eg. an instance of T) is required.

It’s difficult to understand what you’re trying to achieve with this code, maybe try this instead of T in the aforementioned code

3

Well, I have the full code if you want to see it.

package;

import haxe.Exception;
import haxe.Constraints.Function;

/**
 * @author Sirox228
 * @see https://github.com/Sirox228/CustomEvents/
 */

class Event<T>
{
    public function new() {
      	if (!Std.isOfType(T, Function))
          	throw new Exception("type of Event must be function");
      
        trace("new Event successful!");
    }

    public function createEvent(event:String) {
        if (!Reflect.hasField(this, event))
            Reflect.setProperty(this, event, event);
    }

    public function addEventCallback(callback:T, event:String) {
        if (!Reflect.hasField(this, event))
            throw new Exception("no such Event, use createEvent to add one.");
        else
            Reflect.setProperty(this, event + "callback", callback);
    }

    public function trigger(event:String, args:Array<Dynamic>):Dynamic {
        if (Reflect.hasField(this, event) && Reflect.hasField(this, event + "callback"))
            return Reflect.callMethod(this, Reflect.getProperty(this, event + "callback"), args);
        else {
            if (!Reflect.hasField(this, event) && Reflect.hasField(this, event + "callback"))
                throw new Exception("no such Event, use createEvent to add one.");
            else if (!Reflect.hasField(this, event + "callback") && Reflect.hasField(this, event))
                throw new Exception("no such Event, use addEventCallback to add one.");
            else
                throw new Exception("no such event or callback, use createEvent, then addEventCallback to add them.");
        }

        return "haxe won't compile without this return so idk"; 
    }
}