WHY THIS CODE RETURNS ERROR

[RINSON VARGHESE]

public class Comparer<T> { public static bool AreEqual(T o1, T o2) { return (o1 == o2); } } //problem is with O1 == o2 //Help me? //URGENT

[Christian Graus]

because you've not specified that T needs to be an object that has an operator ==, I'd say. It's hard to tell for sure, given that you've not told us the error. I believe you can use .Equals, which is on the object class, but not ==. Again, if I'm wrong it's because you've given me nothing to go on. http://msdn.microsoft.com/en-us/library/d5x73970.aspx[^] is an article on constraints in generics.

Christian Graus Driven to the arms of OSX by Vista. Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

[RINSON VARGHESE]

i think ...what u said is correct.... ..the error i am getting is "operator == can not be applied to operands of type T and T" thanks for ur reply .....

[DaveyM69]

The reason is not everything implements the == operator. All classes (reference types) do, but not all structs (value type) do. If you know that T is always going to be a class then you can use

public class Comparer<T> where T: class
{
// ...
}

and your code will work. All objects implement Equals(object obj) so you can use o1.Equals(o2), but it may not give the result you expect depending on the struct's/class' implementation of this method.

Dave
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BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Why are you using VB6? Do you hate yourself? (Christian Graus)