Re: Which casting conversion to use for void*?

Kai-Uwe Bux <>
Mon, 09 May 2011 23:46:04 +0200
?? Tiib wrote:

On May 10, 12:04 am, Joshua Maurice <> wrote:

On May 9, 1:44 pm, ?? Tiib <> wrote:

On May 9, 9:34 pm, Joshua Maurice <> 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
     virtual void one() {}
     virtual void other() {}

 int main()
     OneInterface* p = new X;
     // static_cast and reinterpret_cast both wrong:
     OtherInterface* p2 = (OtherInterface*)p;

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


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.


Kai-Uwe Bux

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