c and d are considered equal, you have overridden the boolean operators, what the code is actually calling on your if statement is: c.bool() == d.bool() In th

c and d are considered equal, you have overridden the boolean operators, what the code is actually calling on your if statement is: c.bool() == d.bool() In this case both will return true since they are non-zero, and thus the statement would be 1 == 1 Which is true; the compiler did exactly as you told it to do.