Hello! Is there some way to pass a method address as an argument to a native function?
I've read about delegates, but they need to be bound to an object.

If I remember correctly, AngelScript lacks of something equivalent to member pointer in C++.

But maybe you can use anonymous function to achieve this? It can wrap a method as global function, then pass it to native function using asIScriptFunction* to receive it (ref: AngelScript: Funcdefs and script callback functions).

class foo
{
        void f1(int i) { print("f1"); }
        void f2(int i) { print("f2"); }
};

funcdef void memfn(foo@ this_, int i);

memfn@ my_cb;


// Use script function just for showing the logic.

// You can implement it as native funciton for your own program
void set_cb(memfn@ f)
{
        @my_cb = @f;
}

void main()
{
        foo obj;
        set_cb(function(foo@ f, int i) { f.f1(i); });
        my_cb(obj, 0); // Called foo::f1
}

That's correct. The only way to pass a class method from the script to the application is as a delegate, which requires an active object instance. If you only want to store the class method, you can retrieve the method from the delegate with GetDelegateFunction and then release the delegate.