opEquals footprint

[Erik Rasmussen]

xs0 wrote:
> int opEquals(Object)
> 
> so it overrides the default implementation found in, you guessed it, 
> Object :) Same goes for opCmp, I think..
> 
> 
> xs0

So what's the best way to actually check the type in the opEquals/opCmp 
method?  Something like...

class A
{
   int opEquals(Object o)
   {
     // check for null
     if(o is null)
       return false;
     // check type
     if(typeid(typeof(o)) != typeid(A))
       return false;
     // cast
     A that = cast(A) o;
     // actually check fields
     return this.a == that.a && this.b == that.b && ...;
   }
}

Or is there a better way?  asserts?

How do you hard-core D programmers usually do it?

Cheers,
Erik