[sv-bc] List of operators allowed on class object

Hi,
In SV 1800-2005 LRM, I did not see any list of operators to be allowed 
for class object. If we consider the following case:
module top;
    class C;
    endclass

    initial begin:b
        C c;
        if (!c) begin
        end
    end
endmodule

Where '!' unary operator is used on class object. Is it allowed? Though 
table 11-1 says '!' is allowed on integral and real type, whereas class 
object is neither of them. Though most of simulators are passing for the 
case. So my question is - what are the other operators are allowed on 
class object.

-- 
Regards
Surya





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