more about generics

[Tony Johansson]

Hi!

I'm reading in abook and it says the following.
However, attempting to compare the two arguments op1 and op2 below fails to
compile

Public bool Compare(T1 op1, T2 op2)
{
if (op1 == op2)
{
return true;
}
else
{
return false;
}
}

The reson for this is that this code assumens that T1 supports the ==
operator

Can somebody explain why this will not compile and how do I do if I want to
compare op1 to op2 for equality ?

//Tony

 

[eric]

Hi!

I'm reading in abook and it says the following.
However, attempting to compare the two arguments op1 and op2 below fails to
compile

Public bool Compare(T1 op1, T2 op2)
{
      if (op1 == op2)
      {
           return true;
      }
      else
      {
            return false;
       }

}

The reson for this is that this code assumens that T1 supports the ==
operator

Can somebody explain why this will not compile and how do I do if I want to
compare op1 to op2 for equality ?

//Tony

You can't use "a == b" if a and b don't have the same type.
To compare a and b, i'll use the equals method inherited from Object.
Probably something like that :

Public bool Compare(T1 op1, T2 op2)
{
return op1.equals(op2);
}