Comparing Instances of a Type Parameter

   
 

using System;

class MyClass : IComparable {
  public int val;

  public MyClass(int x) { 
    val = x; 
  }
  public int CompareTo(object obj) {
    return val - ((MyClass) obj).val;
  }
}

class CompareDemo {
  public static bool contains<T>(T what, T[] obs) where T : IComparable {
    foreach(T v in obs)
      if(v.CompareTo(what) == 0)
        return true;
    return false;
  }

  public static void Main() {
    int[] nums = { 1, 2, 3, 4, 5 };

    if(contains(2, nums))
      Console.WriteLine("2 is found.");

    string[] strs = { "one", "two", "three"};

    if(contains("two", strs))
      Console.WriteLine("two is found.");

    MyClass[] mcs = { new MyClass(1), new MyClass(2),
                      new MyClass(3), new MyClass(4) };

    if(contains(new MyClass(3), mcs))
      Console.WriteLine("MyClass(3) is found.");

  }
}