//Assignment 7 Herschel Wiseman Ana Zorlas


//Interface to represent an IArith
interface IArith {

  //Accepts an IArithVisitor
  <R> R accept (IArithVisitor<R> visitor);
}

//Object representing a constant double
class Const implements IArithVisitor {
  double num;

  //Constructor
  Const(double num) {
    this.num= num;
  }

  //Accepts the IArithVisitor
  public <R> R accept(IArithVisitor<R> visitor) {
    return visitor.Const(this);
  }
}

//Object representing a Formula
class Formula implements IArith {
  IFunc2<Double, Double, Double> fun;
  String name;
  IArith left;
  IArith right;

  //Constructor
  Formula(IFunc2<Double, Double, Double> fun, String name, IArith left, IArith right) {
    this.fun = fun;
    this.name = name;
    this.left = left;
    this.right = right;
  }

  @Override
  public <R> R accept(IArithVisitor<R> visitor) {
    // TODO Auto-generated method stub
    return null;
  }
}


//Interface for three argument function-objects with signature [A1, A2, A3 -> R]
interface IFunc2<A1, A2, A3, R> {
  R apply(A1 arg1, A2 arg2, A3 arg3);
}

// Visitor thingy
interface IArithVisitor<R> {
  R Formula(T t);
  R Const(T t);
}