Pass generic in method parameter?

Question

Hi,

I have class Tour inherit from class Chromosom

public abstract class Chromosom {}

public class Tour: Chromosom

and I also have class IFitness using Chromosom als Parameter

interface IFitness
{
    double Calculate(Chromosom chromosom);
}

Is it possible to have something like this

public class Fitness : IFitness
{
      public double Calculate(Tour tour)
      {
      }
}

instead of

public class Fitness : IFitness
{
      public double Calculate(Chromosom chromosom)
      {
      }
}

using generics maybe?

Many thanks :)

Answer 1

Try a structure like this:

  public abstract class Chromosum {}

  public class Tour : Chromosum {}

  public interface IFitness<T> where T : Chromosum {
    double Calculate(T t);
  }

  public class FitnessTour : IFitness<Tour> {
    public double Calculate(Tour tour) {
      return 0D;
    }

    public double RunIt() {
      return Calculate(new Tour());
    }
  }

---

"Premature optimization is the root of all evil." - Knuth

If I provoked thought, please click the green arrow

If I provoked Aha! please click Propose as Answer

We are here to learn, to share knowledge, and to earn points; all in about equal measure.

Answer 2

Wow this is what I am looking for. Thank you :)

Answer 3

I did move the type parameter from the method Calculate to the interface IFitness, which is usually (but not always) a better match to requirements.

---

"Premature optimization is the root of all evil." - Knuth

If I provoked thought, please click the green arrow

If I provoked Aha! please click Propose as Answer

We are here to learn, to share knowledge, and to earn points; all in about equal measure.