Re: Which casting conversion to use for void*?
?? Tiib wrote:
On May 10, 12:04 am, Joshua Maurice <joshuamaur...@gmail.com> wrote:
On May 9, 1:44 pm, ?? Tiib <oot...@hot.ee> wrote:
On May 9, 9:34 pm, Joshua Maurice <joshuamaur...@gmail.com> wrote:
In all cases, the C-style cast is equivalent to either a
static_cast or a reinterpret_cast, and as you have pointed out, it
can be quite "ambiguous", or hard to tell for a human reader, which
it is when working with class types.
Nitpick ... in all cases C-style cast is either a static_cast,
dynamic_cast, const_cast, reinterpret_cast or combination of such.
const_cast yes, but unless I'm losing my mind, C-style casts can never
be dynamic_casts. Can it? Example please? I was pretty sure no, but
now you're making me question that. Whipping through a couple of
examples, I'm pretty sure no still.
Not sure ... isn't it dynamic_cast like that:
struct OneInterface
{
virtual void one() = 0;
};
struct OtherInterface
{
virtual void other() = 0;
};
class X
: public OneInterface
, public OtherInterface
{
public:
virtual void one() {}
virtual void other() {}
};
int main()
{
OneInterface* p = new X;
p->one();
// static_cast and reinterpret_cast both wrong:
OtherInterface* p2 = (OtherInterface*)p;
p2->other();
}
Assuming that the code compiles (did not check too hard), I think the line
OtherInterface* p2 = (OtherInterface*)p;
is seen by the compiler as a reinterpret_cast as per [5.9/7] and the line
p2->other();
is undefined behavior. In [5.4/5] and [5.4/7], you find a list of what the
cast notation can mean; and a dynamic_cast is not listed.
Best,
Kai-Uwe Bux
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