Turning off C++ casting?

[Vladimir Merzliakov]

>> |   assert (dynamic_cast<ExtendedObject*>(&baseObj) != NULL);
>> |   ExtendedObject& obj = *reinterpret_cast<ExtendedObject*>(&baseObj);
>>
>> Please write the last line as
>>
>>    ExtendedObject& obj = *dynamic_cast<ExtendedObject*>(&baseObj);
>
>Why?  The point was to avoid the performance impact (assuming there is) of
>dynamic_cast in non-debugging releases.  After the dynamic_cast has been
>checked to be valid, you can use the faster reinterpret_cast safely, can't
>you?

I think expression:

(dynamic_cast<T*>(v)==0 || dynamic_cast<T*>(v)==reinterpret_cast<T*>(v))

can be false in case multiply inheritance and virtual inheritance.


Vladimir