Re: RTTI in C++
In article <38983893.mvc0reNidP@ingen.ddns.info>,
bart@ingen.ddns.info says...
[ ... ]
If we assume your interpretation of that paragraph is correct, then
the code
void* vp;
dynamic_cast<T*>(vp);
is still ill-formed due to clause 5.2.7/6: "Otherwise, v shall be a
pointer to or an lvalue of a polymorphic type (10.3)"
Yes, that would be ill-formed. The question is whether something
like:
class whatever {
public:
virtual void member() {}
};
whatever w;
// cast 1
void *v = dynamic_cast<void *>(&w);
// cast 2
whatever *pw = dynamic_cast<whatever *>(v);
At least as I read things, cast 1 is allowed by ?5.2.7/7. As I read ?
5.2.7/2,5&6, cast 2 should be allowed by as well. The static type of
the pointer is void *, but it is still an rvalue of a pointer to an
object of a complete, polymorphic class type. As such, it seem to me
that it fits all the requirements stated in the standard to be an
operand of dynamic_cast.
--
Later,
Jerry.
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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