abstract class question about operators

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hi

just a quick question - i have the something like the following

public abstract class ClassA
{
protected int iA;

public int Value { get {return iA;} set { iA = value;}}

public ClassA(int value)
{ iA = value; }

public static ClassA operator +(ClassA a1, ClassA a2)
{
a1.Value = a1.Value + a2.Value;
return a1;
}

public static ClassA operator -(ClassA a1, ClassA a2)
{
a1.Value = a1.Value - a2.Value;
return a1;
}
}

public class ClassB : ClassA
{
public ClassB(int value) : base(value)
{ }
}

public class ClassC : ClassA
{
public ClassB(int value) : base(value)
{ }
}

Problem is, if i try this
ClassB cb1 = new ClassB(1);
ClassB cb2 = new ClassB(2);
ClassB cb3 = cb1 + cb2;

I get an error as cb1 + cb2 is of type ClassA....

Question: Is there a way of putting all my operator overloads in the base
class and instead of having to put them in each of the derived classes?

Thanks
t f


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