Runtime method for getting number of parameters in anonymous function?

1

The following way of getting the number of parameters of an anon function at runtime works in JS,
but not on Eval or Cpp. (Haven’t tried other platforms.)
I there any other runtime way, or do I have to go the macro route?

function main() {
	var callback = (v:Int, a:String) -> {
		trace(v);
	};

	var length:Null<Int> = Reflect.getProperty(callback, 'length');
	trace(length); // Works in JS, but gives null in Eval, CPP...
}
2

Using a macro to find out the number of args of a function with a known signature is trivial, but I’m not sure what that would really accomplish: Try Haxe !

Perhaps some context would help for offering a practical solution :wink:

1 Like