Question

I am trying to write a scripted AI; and ran into this problem. In the following base class, how can I tell x that it can just as well expect a write reference?

class Node <T0, T1, T2> {
    Node() {
        // More missing non-relevance.
    }
    T0 write(T1 x) {
        T0.write(x.read());
    }
    T0 write(T2 x) {
        T0.write(x.read());
    }
}

EDIT:
Here is the error:

Parser.java:181: cannot find symbol
symbol  : method read()
location: class java.lang.Object

P.S. Or should I just do this in C++ function pointers.

Answer 1

In java you would need an Interface/class that has the read method. You ether use a standard one (perhaps x is an OutputStream implementation?). Otherwise you would create your own interface. (Had to interpret a lot, but perhaps the code below is helpful)

class Node <T0 extends OutputStream, T1 extends InputStream> {

  T0 to;


  Node(T0 to) {
    this.to = to;
  }

  T0 write(T1 x) throws IOException {
    to.write(x.read());
    return to;
  }

}