using System;
class MyClass : IComparable {
public int val;
public MyClass(int x) { val = x; }
// Implement IComparable.
public int CompareTo(object obj) {
return val - ((MyClass) obj).val;
}
}
class MainClass {
public static bool isIn<T>(T what, T[] obs) where T : IComparable {
foreach(T v in obs)
if(v.CompareTo(what) == 0) // now OK, uses CompareTo()
return true;
return false;
}
public static void Main() {
// Use isIn() with int.
int[] nums = { 1, 2, 3, 4, 5 };
if(isIn(2, nums))
Console.WriteLine("2 is found.");
// Use isIn() with string.
string[] strs = { "one", "two", "Three"};
if(isIn("two", strs))
Console.WriteLine("two is found.");
// Use isIn with MyClass.
MyClass[] mcs = { new MyClass(1), new MyClass(2),
new MyClass(3), new MyClass(4) };
if(isIn(new MyClass(3), mcs))
Console.WriteLine("MyClass(3) is found.");
if(isIn(new MyClass(99), mcs))
Console.WriteLine("This won't display.");
}
}
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